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pmc (3)
  • >> pmc (3) ( FreeBSD man: Библиотечные вызовы )
  • Ключ pmc обнаружен в базе ключевых слов.

  • BSD mandoc
     

    NAME

    pmc_allocate
    
     
    pmc_attach
    
     
    pmc_capabilities
    
     
    pmc_configure_logfile
    
     
    pmc_cpuinfo
    
     
    pmc_detach
    
     
    pmc_disable
    
     
    pmc_enable
    
     
    pmc_event_names_of_class
    
     
    pmc_flush_logfile
    
     
    pmc_get_driver_stats
    
     
    pmc_get_msr
    
     
    pmc_init
    
     
    pmc_name_of_capability
    
     
    pmc_name_of_class
    
     
    pmc_name_of_cputype
    
     
    pmc_name_of_event
    
     
    pmc_name_of_mode
    
     
    pmc_name_of_state
    
     
    pmc_ncpu
    
     
    pmc_npmc
    
     
    pmc_pmcinfo
    
     
    pmc_read
    
     
    pmc_release
    
     
    pmc_rw
    
     
    pmc_set
    
     
    pmc_start
    
     
    pmc_stop
    
     
    pmc_width
    
     
    pmc_write
    
     
    pmc_writelog
    
     - programming API for using hardware performance monitoring counters
    
     
    

    LIBRARY

    Lb libpmc
    
     
    

    SYNOPSIS

       #include <pmc.h>
    int Fo pmc_allocate Fa const char *eventspecifier Fa enum pmc_mode mode Fa uint32_t flags Fa int cpu Fa pmc_id_t *pmcid Fc Ft int pmc_attach (pmc_id_t pmcid pid_t pid);
    int pmc_capabilities (pmc_id_t pmc uint32_t *caps);
    int pmc_configure_logfile (int fd);
    int pmc_cpuinfo (const struct pmc_cpuinfo **cpu_info);
    int pmc_detach (pmc_id_t pmcid pid_t pid);
    int pmc_disable (int cpu int pmc);
    int pmc_enable (int cpu int pmc);
    int Fo pmc_event_names_of_class Fa enum pmc_class cl Fa const char ***eventnames Fa int *nevents Fc Ft int pmc_flush_logfile (void);
    int pmc_get_driver_stats (struct pmc_driverstats *gms);
    int pmc_get_msr (pmc_id_t pmc uint32_t *msr);
    int pmc_init (void);
    const char * pmc_name_of_capability (enum pmc_caps pc);
    const char * pmc_name_of_class (enum pmc_class pc);
    const char * pmc_name_of_cputype (enum pmc_cputype ct);
    const char * pmc_name_of_disposition (enum pmc_disp pd);
    const char * pmc_name_of_event (enum pmc_event pe);
    const char * pmc_name_of_mode (enum pmc_mode pm);
    const char * pmc_name_of_state (enum pmc_state ps);
    int pmc_ncpu (void);
    int pmc_npmc (int cpu);
    int pmc_pmcinfo (int cpu struct pmc_pmcinfo **pmc_info);
    int pmc_read (pmc_id_t pmc pmc_value_t *value);
    int pmc_release (pmc_id_t pmc);
    int pmc_rw (pmc_id_t pmc pmc_value_t newvalue pmc_value_t *oldvaluep);
    int pmc_set (pmc_id_t pmc pmc_value_t value);
    int pmc_start (pmc_id_t pmc);
    int pmc_stop (pmc_id_t pmc);
    int pmc_write (pmc_id_t pmc pmc_value_t value);
    int pmc_writelog (uint32_t userdata);
    int pmc_width (pmc_id_t pmc uint32_t *width);
     

    DESCRIPTION

    These functions implement a high-level library for using the system's hardware performance counters.

    PMCs are allocated using pmc_allocate (,);
    released using pmc_release ();
    and read using pmc_read (.);
    Allocated PMCs may be started or stopped at any time using pmc_start ();
    and pmc_stop ();
    respectively. An allocated PMC may be of ``global'' scope, meaning that the PMC measures system-wide events, or ``process-private'' scope, meaning that the PMC only counts hardware events when the allocating process (or, optionally, its children) are active.

    PMCs may further be in ``counting mode'' or in ``sampling mode'' Sampling mode PMCs deliver an interrupt to the CPU after a configured number of hardware events have been seen. A process-private sampling mode PMC will cause its owner process to get periodic SIGPROF interrupts, while a global sampling mode PMC is used to do system-wide statistical sampling (see hwpmc(4)). The sampling rate desired of a sampling-mode PMC is set using pmc_set (.);
    Counting mode PMCs do not interrupt the CPU; their values can be read using pmc_read (.);

    System-wide statistical sampling is configured by allocating at least one sampling mode PMC with global scope, and when a log file is configured using pmc_configure_logfile (.);
    The hwpmc(4) driver manages system-wide statistical sampling; for more information please see hwpmc(4).  

    Application Programming Interface

    The function pmc_init ();
    initializes the pmc library. This function must be called first, before any of the other functions in the library.

    The function pmc_allocate ();
    allocates a counter that counts the events named by Fa eventspecifier , and writes the allocated counter ID to Fa *pmcid . Argument Fa eventspecifier comprises an PMC event name followed by an optional comma separated list of keywords and qualifiers. The allowed syntax for Fa eventspecifier is processor architecture specific and is listed in section Sx EVENT SPECIFIERS below. The desired PMC mode is specified by Fa mode , and any mode specific modifiers are specified using Fa flags . The Fa cpu argument is the value PMC_CPU_ANY or names the CPU the allocation is to be on. Requesting a specific CPU only makes sense for global PMCs; process-private PMC allocations should always specify PMC_CPU_ANY

    By default, a PMC configured in process-virtual counting mode is set up to profile its owner process. The function pmc_attach ();
    may be used to attach the PMC to a different process. It needs to be called before the counter is first started with pmc_start (.);
    The function pmc_detach ();
    may be used to detach a PMC from a process it was attached to using a prior call to pmc_attach (.);

    The function pmc_release ();
    releases a PMC previously allocated with pmc_allocate (.);
    This function call implicitly detaches the PMC from all its target processes.

    An allocated PMC may be started and stopped using pmc_start ();
    and pmc_stop ();
    respectively.

    The current value of a PMC may be read with pmc_read ();
    and written using pmc_write (,);
    provided the underlying hardware supports these operations on the allocated PMC. The read and write operation may be combined using pmc_rw (.);

    The function pmc_capabilities ();
    sets argument Fa caps to a bitmask of capabilities supported by the PMC denoted by argument Fa pmc . The function pmc_width ();
    sets argument Fa width to the width of the PMC denoted by argument Fa pmc .

    The pmc_configure_logfile ();
    function causes the hwpmc(4) driver to log performance data to file corresponding to the process' file handle Fa fd . If argument Fa fd is -1, then any previously configured logging is reset and all data queued to be written are discarded.

    The pmc_flush_logfile ();
    function will send all data queued inside the hwpmc(4) driver to the configured log file before returning. The pmc_writelog ();
    function will append a log entry containing the argument Fa userdata to the log file.

    The function pmc_set ();
    configures a sampling PMC Fa pmc to interrupt every Fa value events. For counting PMCs, pmc_set ();
    sets the initial value of the PMC to Fa value .

    The function pmc_get_driver_statistics ();
    copies a snapshot of the usage statistics maintained by hwpmc(4) into the memory area pointed to by argument Fa gms .  

    Signal Handling Requirements

    Applications using PMCs are required to handle the following signals:

    SIGBUS
    When the hwpmc(4) module is unloaded using kldunload(8), processes that have PMCs allocated to them will be sent a SIGBUS signal.
    SIGIO
    The hwpmc(4) driver will send a PMC owning process a SIGIO signal if:

     

    Convenience Functions

    The function pmc_ncpu ();
    returns the number of CPUs present in the system.

    The function pmc_npmc ();
    returns the number of PMCs supported on CPU Fa cpu . The function pmc_cpuinfo ();
    sets argument Fa cpu_info to point to an internal structure with information about the system's CPUs. The caller should not free ();
    this pointer value. Function pmc_pmcinfo ();
    returns information about the current state of CPU Fa cpu Ns 's PMCs. This function sets argument Fa *pmc_info to point to a memory area allocated with calloc(3). The caller is expected to free ();
    the area when done.

    The functions pmc_name_of_capability (,);
    pmc_name_of_class (,);
    pmc_name_of_cputype (,);
    pmc_name_of_disposition (,);
    pmc_name_of_event (,);
    pmc_name_of_mode ();
    and pmc_name_of_state ();
    are useful for code wanting to print error messages. They return Vt const char * pointers to human-readable representations of their arguments. These return values should not be freed using free(3).

    The function pmc_event_names_of_class ();
    returns a list of event names supported by a given PMC class Fa cl . On successful return, an array of Vt const char * pointers to the names of valid events supported by class Fa cl is allocated by the library using malloc(3), and a pointer to this array is returned in the location pointed to by Fa eventnames . The number of pointers allocated is returned in the location pointed to by Fa nevents .  

    Administration

    Individual PMCs may be enabled or disabled on a given CPU using pmc_enable ();
    and pmc_disable ();
    respectively. For these functions, Fa cpu is the CPU number, and Fa pmc is the index of the PMC to be operated on. Only the super-user is allowed to enable and disable PMCs.  

    x86 Architecture Specific API

    The pmc_get_msr ();
    function returns the processor model specific register number associated with Fa pmc . Applications may use the x86 RDPMC instruction to directly read the contents of the PMC.  

    EVENT SPECIFIERS

    Event specifiers are strings comprising of an event name, followed by optional parameters modifying the semantics of the hardware event being probed. Event names are PMC architecture dependent, but the hwpmc(4) library defines machine independent aliases for commonly used events.  

    Event Name Aliases

    Event name aliases are CPU architecture independent names for commonly used events. The following aliases are known to this version of the pmc library:

    branches
    Measure the number of branches retired.
    branch-mispredicts
    Measure the number of retired branches that were mispredicted.
    cycles
    Measure processor cycles. This event is implemented using the processor's Time Stamp Counter register.
    dc-misses
    Measure the number of data cache misses.
    ic-misses
    Measure the number of instruction cache misses.
    instructions
    Measure the number of instructions retired.
    interrupts
    Measure the number of interrupts seen.
    unhalted-cycles
    Measure the number of cycles the processor is not in a halted or sleep state.

     

    Time Stamp Counter (TSC)

    The timestamp counter is a monotonically non-decreasing counter that counts processor cycles.

    In the i386 architecture, this counter may be selected by requesting an event with event specifier ``tsc '' The ``tsc '' event does not support any further qualifiers. It can only be allocated in system-wide counting mode, and is a read-only counter. Multiple processes are allowed to allocate the TSC. Once allocated, it may be read using the pmc_read ();
    function, or by using the RDTSC instruction.  

    AMD (K7) PMCs These PMCs are present in the

    AMD Athlon series of CPUs and are documented in:
    "AMD Athlon Processor x86 Code Optimization Guide" "Publication No. 22007" "February 2002" "Advanced Micro Devices, Inc."

    Event specifiers for AMD K7 PMCs can have the following optional qualifiers:

    count= value
    Configure the counter to increment only if the number of configured events measured in a cycle is greater than or equal to value
    edge
    Configure the counter to only count negated-to-asserted transitions of the conditions expressed by the other qualifiers. In other words, the counter will increment only once whenever a given condition becomes true, irrespective of the number of clocks during which the condition remains true.
    inv
    Invert the sense of comparision when the ``count '' qualifier is present, making the counter to increment when the number of events per cycle is less than the value specified by the ``count '' qualifier.
    os
    Configure the PMC to count events happening at privilege level 0.
    unitmask= mask
    This qualifier is used to further qualify a select few events, ``k7-dc-refills-from-l2 '' ``k7-dc-refills-from-system '' and ``k7-dc-writebacks '' Here mask is a string of the following characters optionally separated by `+' characters:

    m
    Count operations for lines in the ``Modified'' state.
    o
    Count operations for lines in the ``Owner'' state.
    e
    Count operations for lines in the ``Exclusive'' state.
    s
    Count operations for lines in the ``Shared'' state.
    i
    Count operations for lines in the ``Invalid'' state.

    If no ``unitmask '' qualifier is specified, the default is to count events for caches lines in any of the above states.

    usr
    Configure the PMC to count events occurring at privilege levels 1, 2 or 3.

    If neither of the ``os '' or ``usr '' qualifiers were specified, the default is to enable both.

    The event specifiers supported on AMD K7 PMCs are:

    k7-dc-accesses
    Count data cache accesses.
    k7-dc-misses
    Count data cache misses.
    k7-dc-refills-from-l2 [,unitmask= mask ]
    Count data cache refills from L2 cache. This event may be further qualified using the ``unitmask '' qualifier.
    k7-dc-refills-from-system [,unitmask= mask ]
    Count data cache refills from system memory. This event may be further qualified using the ``unitmask '' qualifier.
    k7-dc-writebacks [,unitmask= mask ]
    Count data cache writebacks. This event may be further qualified using the ``unitmask '' qualifier.
    k7-l1-dtlb-miss-and-l2-dtlb-hits
    Count L1 DTLB misses and L2 DTLB hits.
    k7-l1-and-l2-dtlb-misses
    Count L1 and L2 DTLB misses.
    k7-misaligned-references
    Count misaligned data references.
    k7-ic-fetches
    Count instruction cache fetches.
    k7-ic-misses
    Count instruction cache misses.
    k7-l1-itlb-misses
    Count L1 ITLB misses that are L2 ITLB hits.
    k7-l1-l2-itlb-misses
    Count L1 (and L2) ITLB misses.
    k7-retired-instructions
    Count all retired instructions.
    k7-retired-ops
    Count retired ops.
    k7-retired-branches
    Count all retired branches (conditional, unconditional, exceptions and interrupts).
    k7-retired-branches-mispredicted
    Count all misprediced retired branches.
    k7-retired-taken-branches
    Count retired taken branches.
    k7-retired-taken-branches-mispredicted
    Count mispredicted taken branches that were retired.
    k7-retired-far-control-transfers
    Count retired far control transfers.
    k7-retired-resync-branches
    Count retired resync branches (non control transfer branches).
    k7-interrupts-masked-cycles
    Count the number of cycles when the processor's IF flag was zero.
    k7-interrupts-masked-while-pending-cycles
    Count the number of cycles interrupts were masked while pending due to the processor's IF flag being zero.
    k7-hardware-interrupts
    Count the number of taken hardware interrupts.

     

    AMD (K8) PMCs These PMCs are present in the

    AMD Athlon64 and AMD Opteron series of CPUs. They are documented in:
    "BIOS and Kernel Developer's Guide for the AMD Athlon(tm) 64 and AMD Opteron Processors" "Publication No. 26094" "April 2004" "Advanced Micro Devices, Inc."

    Event specifiers for AMD K8 PMCs can have the following optional qualifiers:

    count= value
    Configure the counter to increment only if the number of configured events measured in a cycle is greater than or equal to value
    edge
    Configure the counter to only count negated-to-asserted transitions of the conditions expressed by the other fields. In other words, the counter will increment only once whenever a given condition becomes true, irrespective of the number of clocks during which the condition remains true.
    inv
    Invert the sense of comparision when the ``count '' qualifier is present, making the counter to increment when the number of events per cycle is less than the value specified by the ``count '' qualifier.
    mask= qualifier
    Many event specifiers for AMD K8 PMCs need to be additionally qualified using a mask qualifier. These additional qualifiers are event-specific and are documented along with their associated event specifiers below.
    os
    Configure the PMC to count events happening at privilege level 0.
    usr
    Configure the PMC to count events occurring at privilege levels 1, 2 or 3.

    If neither of the ``os '' or ``usr '' qualifiers were specified, the default is to enable both.

    The event specifiers supported on AMD K8 PMCs are:

    k8-bu-cpu-clk-unhalted
    Count the number of clock cycles when the CPU is not in the HLT or STPCLK states.
    k8-bu-fill-request-l2-miss [,mask= qualifier ]
    Count fill requests that missed in the L2 cache. This event may be further qualified using qualifier which is a `+' separated set of the following keywords:

    dc-fill
    Count data cache fill requests.
    ic-fill
    Count instruction cache fill requests.
    tlb-reload
    Count TLB reloads.

    The default is to count all types of requests.

    k8-bu-internal-l2-request [,mask= qualifier ]
    Count internally generated requests to the L2 cache. This event may be further qualified using qualifier which is a `+' separated set of the following keywords:

    cancelled
    Count cancelled requests.
    dc-fill
    Count data cache fill requests.
    ic-fill
    Count instruction cache fill requests.
    tag-snoop
    Count tag snoop requests.
    tlb-reload
    Count TLB reloads.

    The default is to count all types of requests.

    k8-dc-access
    Count data cache accesses including microcode scratchpad accesses.
    k8-dc-copyback [,mask= qualifier ]
    Count data cache copyback operations. This event may be further qualified using qualifier which is a `+' separated set of the following keywords:

    exclusive
    Count operations for lines in the ``exclusive'' state.
    invalid
    Count operations for lines in the ``invalid'' state.
    modified
    Count operations for lines in the ``modified'' state.
    owner
    Count operations for lines in the ``owner'' state.
    shared
    Count operations for lines in the ``shared'' state.

    The default is to count operations for lines in all the above states.

    k8-dc-dcache-accesses-by-locks [,mask= qualifier ]
    Count data cache accesses by lock instructions. This event is only available on processors of revision C or later vintage. This event may be further qualified using qualifier which is a `+' separated set of the following keywords:

    accesses
    Count data cache accesses by lock instructions.
    misses
    Count data cache misses by lock instructions.

    The default is to count all accesses.

    k8-dc-dispatched-prefetch-instructions [,mask= qualifier ]
    Count the number of dispatched prefetch instructions. This event may be further qualified using qualifier which is a `+' separated set of the following keywords:

    load
    Count load operations.
    nta
    Count non-temporal operations.
    store
    Count store operations.

    The default is to count all operations.

    k8-dc-l1-dtlb-miss-and-l2-dtlb-hit
    Count L1 DTLB misses that are L2 DTLB hits.
    k8-dc-l1-dtlb-miss-and-l2-dtlb-miss
    Count L1 DTLB misses that are also misses in the L2 DTLB.
    k8-dc-microarchitectural-early-cancel-of-an-access
    Count microarchitectural early cancels of data cache accesses.
    k8-dc-microarchitectural-late-cancel-of-an-access
    Count microarchitectural late cancels of data cache accesses.
    k8-dc-misaligned-data-reference
    Count misaligned data references.
    k8-dc-miss
    Count data cache misses.
    k8-dc-one-bit-ecc-error [,mask= qualifier ]
    Count one bit ECC errors found by the scrubber. This event may be further qualified using qualifier which is a `+' separated set of the following keywords:

    scrubber
    Count scrubber detected errors.
    piggyback
    Count piggyback scrubber errors.

    The default is to count both kinds of errors.

    k8-dc-refill-from-l2 [,mask= qualifier ]
    Count data cache refills from L2 cache. This event may be further qualified using qualifier which is a `+' separated set of the following keywords:

    exclusive
    Count operations for lines in the ``exclusive'' state.
    invalid
    Count operations for lines in the ``invalid'' state.
    modified
    Count operations for lines in the ``modified'' state.
    owner
    Count operations for lines in the ``owner'' state.
    shared
    Count operations for lines in the ``shared'' state.

    The default is to count operations for lines in all the above states.

    k8-dc-refill-from-system [,mask= qualifier ]
    Count data cache refills from system memory. This event may be further qualified using qualifier which is a `+' separated set of the following keywords:

    exclusive
    Count operations for lines in the ``exclusive'' state.
    invalid
    Count operations for lines in the ``invalid'' state.
    modified
    Count operations for lines in the ``modified'' state.
    owner
    Count operations for lines in the ``owner'' state.
    shared
    Count operations for lines in the ``shared'' state.

    The default is to count operations for lines in all the above states.

    k8-fp-dispatched-fpu-ops [,mask= qualifier ]
    Count the number of dispatched FPU ops. This event is supported in revision B and later CPUs. This event may be further qualified using qualifier which is a `+' separated set of the following keywords:

    add-pipe-excluding-junk-ops
    Count add pipe ops excluding junk ops.
    add-pipe-junk-ops
    Count junk ops in the add pipe.
    multiply-pipe-excluding-junk-ops
    Count multiply pipe ops excluding junk ops.
    multiply-pipe-junk-ops
    Count junk ops in the multiply pipe.
    store-pipe-excluding-junk-ops
    Count store pipe ops excluding junk ops
    store-pipe-junk-ops
    Count junk ops in the store pipe.

    The default is to count all types of ops.

    k8-fp-cycles-with-no-fpu-ops-retired
    Count cycles when no FPU ops were retired. This event is supported in revision B and later CPUs.
    k8-fp-dispatched-fpu-fast-flag-ops
    Count dispatched FPU ops that use the fast flag interface. This event is supported in revision B and later CPUs.
    k8-fr-decoder-empty
    Count cycles when there was nothing to dispatch (i.e., the decoder was empty).
    k8-fr-dispatch-stalls
    Count all dispatch stalls.
    k8-fr-dispatch-stall-for-segment-load
    Count dispatch stalls for segment loads.
    k8-fr-dispatch-stall-for-serialization
    Count dispatch stalls for serialization.
    k8-fr-dispatch-stall-from-branch-abort-to-retire
    Count dispatch stalls from branch abort to retiral.
    k8-fr-dispatch-stall-when-fpu-is-full
    Count dispatch stalls when the FPU is full.
    k8-fr-dispatch-stall-when-ls-is-full
    Count dispatch stalls when the load/store unit is full.
    k8-fr-dispatch-stall-when-reorder-buffer-is-full
    Count dispatch stalls when the reorder buffer is full.
    k8-fr-dispatch-stall-when-reservation-stations-are-full
    Count dispatch stalls when reservation stations are full.
    k8-fr-dispatch-stall-when-waiting-for-all-to-be-quiet
    Count dispatch stalls when waiting for all to be quiet.
    k8-fr-dispatch-stall-when-waiting-far-xfer-or-resync-branch-pending
    Count dispatch stalls when a far control transfer or a resync branch is pending.
    k8-fr-fpu-exceptions [,mask= qualifier ]
    Count FPU exceptions. This event is supported in revision B and later CPUs. This event may be further qualified using qualifier which is a `+' separated set of the following keywords:

    sse-and-x87-microtraps
    Count SSE and x87 microtraps.
    sse-reclass-microfaults
    Count SSE reclass microfaults
    sse-retype-microfaults
    Count SSE retype microfaults
    x87-reclass-microfaults
    Count x87 reclass microfaults.

    The default is to count all types of exceptions.

    k8-fr-interrupts-masked-cycles
    Count cycles when interrupts were masked (by CPU RFLAGS field IF was zero).
    k8-fr-interrupts-masked-while-pending-cycles
    Count cycles while interrupts were masked while pending (i.e., cycles when INTR was asserted while CPU RFLAGS field IF was zero).
    k8-fr-number-of-breakpoints-for-dr0
    Count the number of breakpoints for DR0.
    k8-fr-number-of-breakpoints-for-dr1
    Count the number of breakpoints for DR1.
    k8-fr-number-of-breakpoints-for-dr2
    Count the number of breakpoints for DR2.
    k8-fr-number-of-breakpoints-for-dr3
    Count the number of breakpoints for DR3.
    k8-fr-retired-branches
    Count retired branches including exceptions and interrupts.
    k8-fr-retired-branches-mispredicted
    Count mispredicted retired branches.
    k8-fr-retired-far-control-transfers
    Count retired far control transfers (which are always mispredicted).
    k8-fr-retired-fastpath-double-op-instructions [,mask= qualifier ]
    Count retired fastpath double op instructions. This event is supported in revision B and later CPUs. This event may be further qualified using qualifier which is a `+' separated set of the following keywords:

    low-op-pos-0
    Count instructions with the low op in position 0.
    low-op-pos-1
    Count instructions with the low op in position 1.
    low-op-pos-2
    Count instructions with the low op in position 2.

    The default is to count all types of instructions.

    k8-fr-retired-fpu-instructions [,mask= qualifier ]
    Count retired FPU instructions. This event is supported in revision B and later CPUs. This event may be further qualified using qualifier which is a `+' separated set of the following keywords:

    mmx-3dnow
    Count MMX and 3DNow! instructions.
    packed-sse-sse2
    Count packed SSE and SSE2 instructions.
    scalar-sse-sse2
    Count scalar SSE and SSE2 instructions
    x87
    Count x87 instructions.

    The default is to count all types of instructions.

    k8-fr-retired-near-returns
    Count retired near returns.
    k8-fr-retired-near-returns-mispredicted
    Count mispredicted near returns.
    k8-fr-retired-resyncs
    Count retired resyncs (non-control transfer branches).
    k8-fr-retired-taken-hardware-interrupts
    Count retired taken hardware interrupts.
    k8-fr-retired-taken-branches
    Count retired taken branches.
    k8-fr-retired-taken-branches-mispredicted
    Count retired taken branches that were mispredicted.
    k8-fr-retired-taken-branches-mispredicted-by-addr-miscompare
    Count retired taken branches that were mispredicted only due to an address miscompare.
    k8-fr-retired-uops
    Count retired uops.
    k8-fr-retired-x86-instructions
    Count retired x86 instructions including exceptions and interrupts.
    k8-ic-fetch
    Count instruction cache fetches.
    k8-ic-instruction-fetch-stall
    Count cycles in stalls due to instruction fetch.
    k8-ic-l1-itlb-miss-and-l2-itlb-hit
    Count L1 ITLB misses that are L2 ITLB hits.
    k8-ic-l1-itlb-miss-and-l2-itlb-miss
    Count ITLB misses that miss in both L1 and L2 ITLBs.
    k8-ic-microarchitectural-resync-by-snoop
    Count microarchitectural resyncs caused by snoops.
    k8-ic-miss
    Count instruction cache misses.
    k8-ic-refill-from-l2
    Count instruction cache refills from L2 cache.
    k8-ic-refill-from-system
    Count instruction cache refills from system memory.
    k8-ic-return-stack-hits
    Count hits to the return stack.
    k8-ic-return-stack-overflow
    Count overflows of the return stack.
    k8-ls-buffer2-full
    Count load/store buffer2 full events.
    k8-ls-locked-operation [,mask= qualifier ]
    Count locked operations. For revision C and later CPUs, the following qualifiers are supported:

    cycles-in-request
    Count the number of cycles in the lock request/grant stage.
    cycles-to-complete
    Count the number of cycles a lock takes to complete once it is non-speculative and is the older load/store operation.
    locked-instructions
    Count the number of lock instructions executed.

    The default is to count the number of lock instructions executed.

    k8-ls-microarchitectural-late-cancel
    Count microarchitectural late cancels of operations in the load/store unit.
    k8-ls-microarchitectural-resync-by-self-modifying-code
    Count microarchitectural resyncs caused by self-modifying code.
    k8-ls-microarchitectural-resync-by-snoop
    Count microarchitectural resyncs caused by snoops.
    k8-ls-retired-cflush-instructions
    Count retired CFLUSH instructions.
    k8-ls-retired-cpuid-instructions
    Count retired CPUID instructions.
    k8-ls-segment-register-load [,mask= qualifier ]
    Count segment register loads. This event may be further qualified using qualifier which is a `+' separated set of the following keywords:

    cs
    Count CS register loads.
    ds
    Count DS register loads.
    es
    Count ES register loads.
    fs
    Count FS register loads.
    gs
    Count GS register loads.
    ss
    Count SS register loads.

    The default is to count all types of loads.

    k8-nb-memory-controller-bypass-saturation [,mask= qualifier ]
    Count memory controller bypass counter saturation events. This event may be further qualified using qualifier which is a `+' separated set of the following keywords:

    dram-controller-interface-bypass
    Count DRAM controller interface bypass.
    dram-controller-queue-bypass
    Count DRAM controller queue bypass.
    memory-controller-hi-pri-bypass
    Count memory controller high priority bypasses.
    memory-controller-lo-pri-bypass
    Count memory controller low priority bypasses.

    k8-nb-memory-controller-dram-slots-missed
    Count memory controller DRAM command slots missed (in MemClks).
    k8-nb-memory-controller-page-access-event [,mask= qualifier ]
    Count memory controller page access events. This event may be further qualified using qualifier which is a `+' separated set of the following keywords:

    page-conflict
    Count page conflicts.
    page-hit
    Count page hits.
    page-miss
    Count page misses.

    The default is to count all types of events.

    k8-nb-memory-controller-page-table-overflow
    Count memory control page table overflow events.
    k8-nb-probe-result [,mask= qualifier ]
    Count probe events. This event may be further qualified using qualifier which is a `+' separated set of the following keywords:

    probe-hit
    Count all probe hits.
    probe-hit-dirty-no-memory-cancel
    Count probe hits without memory cancels.
    probe-hit-dirty-with-memory-cancel
    Count probe hits with memory cancels.
    probe-miss
    Count probe misses.

    k8-nb-sized-commands [,mask= qualifier ]
    Count sized commands issued. This event may be further qualified using qualifier which is a `+' separated set of the following keywords:

    nonpostwrszbyte
    nonpostwrszdword
    postwrszbyte
    postwrszdword
    rdszbyte
    rdszdword
    rdmodwr

    The default is to count all types of commands.

    k8-nb-memory-controller-turnaround [,mask= qualifier ]
    Count memory control turnaround events. This event may be further qualified using qualifier which is a `+' separated set of the following keywords:

    dimm-turnaround
    Count DIMM turnarounds.
    read-to-write-turnaround
    Count read to write turnarounds.
    write-to-read-turnaround
    Count write to read turnarounds.

    The default is to count all types of events.

    k8-nb-ht-bus0-bandwidth [,mask= qualifier ]
    k8-nb-ht-bus1-bandwidth [,mask= qualifier ]
    k8-nb-ht-bus2-bandwidth [,mask= qualifier ]
    Count events on the HyperTransport(tm) buses. These events may be further qualified using qualifier which is a `+' separated set of the following keywords:

    buffer-release
    Count buffer release messages sent.
    command
    Count command messages sent.
    data
    Count data messages sent.
    nop
    Count nop messages sent.

    The default is to count all types of messages.

     

    Intel P6 PMCS

    Intel P6 PMCs are present in Intel Pentium Pro Pentium II Celeron Pentium III and Pentium M processors.

    These CPUs have two counters. Some events may only be used on specific counters and some events are defined only on specific processor models.

    These PMCs are documented in

    "IA-32 Intel(R) Architecture Software Developer's Manual" "Volume 3: System Programming Guide" "Order Number 245472-012" 2003 "Intel Corporation"

    Some of these events are affected by processor errata described in

    "Intel(R) Pentium(R) III Processor Specification Update" "Document Number: 244453-054" "April 2005" "Intel Corporation"

    Event specifiers for Intel P6 PMCs can have the following common qualifiers:

    cmask= value
    Configure the PMC to increment only if the number of configured events measured in a cycle is greater than or equal to value
    edge
    Configure the PMC to count the number of deasserted to asserted transitions of the conditions expressed by the other qualifiers. If specified, the counter will increment only once whenever a condition becomes true, irrespective of the number of clocks during which the condition remains true.
    inv
    Invert the sense of comparision when the ``cmask '' qualifier is present, making the counter increment when the number of events per cycle is less than the value specified by the ``cmask '' qualifier.
    os
    Configure the PMC to count events happening at processor privilege level 0.
    umask= value
    This qualifier is used to further qualify the event selected (see below).
    usr
    Configure the PMC to count events occurring at privilege levels 1, 2 or 3.

    If neither of the ``os '' or ``usr '' qualifiers are specified, the default is to enable both.

    The event specifiers supported by Intel P6 PMCs are:

    p6-baclears
    Count the number of times a static branch prediction was made by the branch decoder because the BTB did not have a prediction.
    p6-br-bac-missp-exec
    (Pentium M ) Count the number of branch instructions executed that where mispredicted at the Front End (BAC).
    p6-br-bogus
    Count the number of bogus branches.
    p6-br-call-exec
    (Pentium M ) Count the number of call instructions executed.
    p6-br-call-missp-exec
    (Pentium M ) Count the number of call instructions executed that were mispredicted.
    p6-br-cnd-exec
    (Pentium M ) Count the number of conditional branch instructions executed.
    p6-br-cnd-missp-exec
    (Pentium M ) Count the number of conditional branch instructions executed that were mispredicted.
    p6-br-ind-call-exec
    (Pentium M ) Count the number of indirect call instructions executed.
    p6-br-ind-exec
    (Pentium M ) Count the number of indirect branch instructions executed.
    p6-br-ind-missp-exec
    (Pentium M ) Count the number of indirect branch instructions executed that were mispredicted.
    p6-br-inst-decoded
    Count the number of branch instructions decoded.
    p6-br-inst-exec
    (Pentium M ) Count the number of branch instructions executed but necessarily retired.
    p6-br-inst-retired
    Count the number of branch instructions retired.
    p6-br-miss-pred-retired
    Count the number of mispredicted branch instructions retired.
    p6-br-miss-pred-taken-ret
    Count the number of taken mispredicted branches retired.
    p6-br-missp-exec
    (Pentium M ) Count the number of branch instructions executed that were mispredicted at execution.
    p6-br-ret-bac-missp-exec
    (Pentium M ) Count the number of return instructions executed that were mispredicted at the Front End (BAC).
    p6-br-ret-exec
    (Pentium M ) Count the number of return instructions executed.
    p6-br-ret-missp-exec
    (Pentium M ) Count the number of return instructions executed that were mispredicted at execution.
    p6-br-taken-retired
    Count the number of taken branches retired.
    p6-btb-misses
    Count the number of branches for which the BTB did not produce a prediction.
    p6-bus-bnr-drv
    Count the number of bus clock cycles during which this processor is driving the BNR# pin.
    p6-bus-data-rcv
    Count the number of bus clock cycles during which this processor is receiving data.
    p6-bus-drdy-clocks [,umask= qualifier ]
    Count the number of clocks during which DRDY# is asserted. An additional qualifier may be specified, and comprises one of the following keywords:

    any
    Count transactions generated by any agent on the bus.
    self
    Count transactions generated by this processor.

    The default is to count operations generated by this processor.

    p6-bus-hit-drv
    Count the number of bus clock cycles during which this processor is driving the HIT# pin.
    p6-bus-hitm-drv
    Count the number of bus clock cycles during which this processor is driving the HITM# pin.
    p6-bus-lock-clocks [,umask= qualifier ]
    Count the number of clocks during with LOCK# is asserted on the external system bus. An additional qualifier may be specified and comprises one of the following keywords:

    any
    Count transactions generated by any agent on the bus.
    self
    Count transactions generated by this processor.

    The default is to count operations generated by this processor.

    p6-bus-req-outstanding
    Count the number of bus requests outstanding in any given cycle.
    p6-bus-snoop-stall
    Count the number of clock cycles during which the bus is snoop stalled.
    p6-bus-tran-any [,umask= qualifier ]
    Count the number of completed bus transactions of any kind. An additional qualifier may be specified and comprises one of the following keywords:

    any
    Count transactions generated by any agent on the bus.
    self
    Count transactions generated by this processor.

    The default is to count operations generated by this processor.

    p6-bus-tran-brd [,umask= qualifier ]
    Count the number of burst read transactions. An additional qualifier may be specified and comprises one of the following keywords:

    any
    Count transactions generated by any agent on the bus.
    self
    Count transactions generated by this processor.

    The default is to count operations generated by this processor.

    p6-bus-tran-burst [,umask= qualifier ]
    Count the number of completed burst transactions. An additional qualifier may be specified and comprises one of the following keywords:

    any
    Count transactions generated by any agent on the bus.
    self
    Count transactions generated by this processor.

    The default is to count operations generated by this processor.

    p6-bus-tran-def [,umask= qualifier ]
    Count the number of completed deferred transactions. An additional qualifier may be specified and comprises one of the following keywords:

    any
    Count transactions generated by any agent on the bus.
    self
    Count transactions generated by this processor.

    The default is to count operations generated by this processor.

    p6-bus-tran-ifetch [,umask= qualifier ]
    Count the number of completed instruction fetch transactions. An additional qualifier may be specified and comprises one of the following keywords:

    any
    Count transactions generated by any agent on the bus.
    self
    Count transactions generated by this processor.

    The default is to count operations generated by this processor.

    p6-bus-tran-inval [,umask= qualifier ]
    Count the number of completed invalidate transactions. An additional qualifier may be specified and comprises one of the following keywords:

    any
    Count transactions generated by any agent on the bus.
    self
    Count transactions generated by this processor.

    The default is to count operations generated by this processor.

    p6-bus-tran-mem [,umask= qualifier ]
    Count the number of completed memory transactions. An additional qualifier may be specified and comprises one of the following keywords:

    any
    Count transactions generated by any agent on the bus.
    self
    Count transactions generated by this processor.

    The default is to count operations generated by this processor.

    p6-bus-tran-pwr [,umask= qualifier ]
    Count the number of completed partial write transactions. An additional qualifier may be specified and comprises one of the following keywords:

    any
    Count transactions generated by any agent on the bus.
    self
    Count transactions generated by this processor.

    The default is to count operations generated by this processor.

    p6-bus-tran-rfo [,umask= qualifier ]
    Count the number of completed read-for-ownership transactions. An additional qualifier may be specified and comprises one of the following keywords:

    any
    Count transactions generated by any agent on the bus.
    self
    Count transactions generated by this processor.

    The default is to count operations generated by this processor.

    p6-bus-trans-io [,umask= qualifier ]
    Count the number of completed I/O transactions. An additional qualifier may be specified and comprises one of the following keywords:

    any
    Count transactions generated by any agent on the bus.
    self
    Count transactions generated by this processor.

    The default is to count operations generated by this processor.

    p6-bus-trans-p [,umask= qualifier ]
    Count the number of completed partial transactions. An additional qualifier may be specified and comprises one of the following keywords:

    any
    Count transactions generated by any agent on the bus.
    self
    Count transactions generated by this processor.

    The default is to count operations generated by this processor.

    p6-bus-trans-wb [,umask= qualifier ]
    Count the number of completed write-back transactions. An additional qualifier may be specified and comprises one of the following keywords:

    any
    Count transactions generated by any agent on the bus.
    self
    Count transactions generated by this processor.

    The default is to count operations generated by this processor.

    p6-cpu-clk-unhalted
    Count the number of cycles during with the processor was not halted.

    (Pentium M ) Count the number of cycles during with the processor was not halted and not in a thermal trip.

    p6-cycles-div-busy
    Count the number of cycles during which the divider is busy and cannot accept new divides. This event is only allocated on counter 0.
    p6-cycles-in-pending-and-masked
    Count the number of processor cycles for which interrupts were disabled and interrupts were pending.
    p6-cycles-int-masked
    Count the number of processor cycles for which interrupts were disabled.
    p6-data-mem-refs
    Count all loads and all stores using any memory type, including internal retries. Each part of a split store is counted separately.
    p6-dcu-lines-in
    Count the total lines allocated in the data cache unit.
    p6-dcu-m-lines-in
    Count the number of M state lines allocated in the data cache unit.
    p6-dcu-m-lines-out
    Count the number of M state lines evicted from the data cache unit.
    p6-dcu-miss-outstanding
    Count the weighted number of cycles while a data cache unit miss is outstanding, incremented by the number of outstanding cache misses at any time.
    p6-div
    Count the number of integer and floating-point divides including speculative divides. This event is only allocated on counter 1.
    p6-emon-esp-uops
    (Pentium M ) Count the total number of micro-ops.
    p6-emon-est-trans [,umask= qualifier ]
    (Pentium M ) Count the number of Enhanced Intel SpeedStep transitions. An additional qualifier may be specified, and can be one of the following keywords:

    all
    Count all transitions.
    freq
    Count only frequency transitions.

    The default is to count all transitions.

    p6-emon-fused-uops-ret [,umask= qualifier ]
    (Pentium M ) Count the number of retired fused micro-ops. An additional qualifier may be specified, and may be one of the following keywords:

    all
    Count all fused micro-ops.
    loadop
    Count only load and op micro-ops.
    stdsta
    Count only STD/STA micro-ops.

    The default is to count all fused micro-ops.

    p6-emon-kni-comp-inst-ret
    (Pentium III ) Count the number of SSE computational instructions retired. An additional qualifier may be specified, and comprises one of the following keywords:

    packed-and-scalar
    Count packed and scalar operations.
    scalar
    Count scalar operations only.

    The default is to count packed and scalar operations.

    p6-emon-kni-inst-retired [,umask= qualifier ]
    (Pentium III ) Count the number of SSE instructions retired. An additional qualifier may be specified, and comprises one of the following keywords:

    packed-and-scalar
    Count packed and scalar operations.
    scalar
    Count scalar operations only.

    The default is to count packed and scalar operations.

    p6-emon-kni-pref-dispatched [,umask= qualifier ]
    (Pentium III ) Count the number of SSE prefetch or weakly ordered instructions dispatched (including speculative prefetches). An additional qualifier may be specified, and comprises one of the following keywords:

    nta
    Count non-temporal prefetches.
    t1
    Count prefetches to L1.
    t2
    Count prefetches to L2.
    wos
    Count weakly ordered stores.

    The default is to count non-temporal prefetches.

    p6-emon-kni-pref-miss [,umask= qualifier ]
    (Pentium III ) Count the number of prefetch or weakly ordered instructions that miss all caches. An additional qualifier may be specified, and comprises one of the following keywords:

    nta
    Count non-temporal prefetches.
    t1
    Count prefetches to L1.
    t2
    Count prefetches to L2.
    wos
    Count weakly ordered stores.

    The default is to count non-temporal prefetches.

    p6-emon-pref-rqsts-dn
    (Pentium M ) Count the number of downward prefetches issued.
    p6-emon-pref-rqsts-up
    (Pentium M ) Count the number of upward prefetches issued.
    p6-emon-simd-instr-retired
    (Pentium M ) Count the number of retired MMX instructions.
    p6-emon-sse-sse2-comp-inst-retired [,umask= qualifier ]
    (Pentium M ) Count the number of computational SSE instructions retired. An additional qualifier may be specified and can be one of the following keywords:

    sse-packed-single
    Count SSE packed-single instructions.
    sse-scalar-single
    Count SSE scalar-single instructions.
    sse2-packed-double
    Count SSE2 packed-double instructions.
    sse2-scalar-double
    Count SSE2 scalar-double instructions.

    The default is to count SSE packed-single instructions.

    p6-emon-sse-sse2-inst-retired [,umask= qualifer ]

    (Pentium M ) Count the number of SSE instructions retired. An additional qualifier can be specified, and can be one of the following keywords:

    sse-packed-single
    Count SSE packed-single instructions.
    sse-packed-single-scalar-single
    Count SSE packed-single and scalar-single instructions.
    sse2-packed-double
    Count SSE2 packed-double instructions.
    sse2-scalar-double
    Count SSE2 scalar-double instructions.

    The default is to count SSE packed-single instructions.

    p6-emon-synch-uops
    (Pentium M ) Count the number of sync micro-ops.
    p6-emon-thermal-trip
    (Pentium M ) Count the duration or occurrences of thermal trips. Use the ``edge '' qualifier to count occurrences of thermal trips.
    p6-emon-unfusion
    (Pentium M ) Count the number of unfusion events in the reorder buffer.
    p6-flops
    Count the number of computational floating point operations retired. This event is only allocated on counter 0.
    p6-fp-assist
    Count the number of floating point exceptions handled by microcode. This event is only allocated on counter 1.
    p6-fp-comps-ops-exe
    Count the number of computation floating point operations executed. This event is only allocated on counter 0.
    p6-fp-mmx-trans [,umask= qualifier ]
    (Pentium II , Pentium III ) Count the number of transitions between MMX and floating-point instructions. An additional qualifier may be specified, and comprises one of the following keywords:

    mmxtofp
    Count transitions from MMX instructions to floating-point instructions.
    fptommx
    Count transitions from floating-point instructions to MMX instructions.

    The default is to count MMX to floating-point transitions.

    p6-hw-int-rx
    Count the number of hardware interrupts received.
    p6-ifu-fetch
    Count the number of instruction fetches, both cacheable and non-cacheable.
    p6-ifu-fetch-miss
    Count the number of instruction fetch misses (i.e., those that produce memory accesses).
    p6-ifu-mem-stall
    Count the number of cycles instruction fetch is stalled for any reason.
    p6-ild-stall
    Count the number of cycles the instruction length decoder is stalled.
    p6-inst-decoded
    Count the number of instructions decoded.
    p6-inst-retired
    Count the number of instructions retired.
    p6-itlb-miss
    Count the number of instruction TLB misses.
    p6-l2-ads
    Count the number of L2 address strobes.
    p6-l2-dbus-busy
    Count the number of cycles during which the L2 cache data bus was busy.
    p6-l2-dbus-busy-rd
    Count the number of cycles during which the L2 cache data bus was busy transferring read data from L2 to the processor.
    p6-l2-ifetch [,umask= qualifier ]
    Count the number of L2 instruction fetches. An additional qualifier may be specified and comprises a list of the following keywords separated by `+' characters:

    e
    Count operations affecting E (exclusive) state lines.
    i
    Count operations affecting I (invalid) state lines.
    m
    Count operations affecting M (modified) state lines.
    s
    Count operations affecting S (shared) state lines.

    The default is to count operations affecting all (MESI) state lines.

    p6-l2-ld [,umask= qualifier ]
    Count the number of L2 data loads. An additional qualifier may be specified and comprises a list of the following keywords separated by `+' characters:

    both
    (Pentium M ) Count both hardware-prefetched lines and non-hardware-prefetched lines.
    e
    Count operations affecting E (exclusive) state lines.
    hw
    (Pentium M ) Count hardware-prefetched lines only.
    i
    Count operations affecting I (invalid) state lines.
    m
    Count operations affecting M (modified) state lines.
    nonhw
    (Pentium M ) Exclude hardware-prefetched lines.
    s
    Count operations affecting S (shared) state lines.

    The default on processors other than Pentium M processors is to count operations affecting all (MESI) state lines. The default on Pentium M processors is to count both hardware-prefetched and non-hardware-prefetch operations on all (MESI) state lines. (Errata) This event is affected by processor errata E53.

    p6-l2-lines-in [,umask= qualifier ]
    Count the number of L2 lines allocated. An additional qualifier may be specified and comprises a list of the following keywords separated by `+' characters:

    both
    (Pentium M ) Count both hardware-prefetched lines and non-hardware-prefetched lines.
    e
    Count operations affecting E (exclusive) state lines.
    hw
    (Pentium M ) Count hardware-prefetched lines only.
    i
    Count operations affecting I (invalid) state lines.
    m
    Count operations affecting M (modified) state lines.
    nonhw
    (Pentium M ) Exclude hardware-prefetched lines.
    s
    Count operations affecting S (shared) state lines.

    The default on processors other than Pentium M processors is to count operations affecting all (MESI) state lines. The default on Pentium M processors is to count both hardware-prefetched and non-hardware-prefetch operations on all (MESI) state lines. (Errata) This event is affected by processor errata E45.

    p6-l2-lines-out [,umask= qualifier ]
    Count the number of L2 lines evicted. An additional qualifier may be specified and comprises a list of the following keywords separated by `+' characters:

    both
    (Pentium M ) Count both hardware-prefetched lines and non-hardware-prefetched lines.
    e
    Count operations affecting E (exclusive) state lines.
    hw
    (Pentium M ) Count hardware-prefetched lines only.
    i
    Count operations affecting I (invalid) state lines.
    m
    Count operations affecting M (modified) state lines.
    nonhw
    (Pentium M only ) Exclude hardware-prefetched lines.
    s
    Count operations affecting S (shared) state lines.

    The default on processors other than Pentium M processors is to count operations affecting all (MESI) state lines. The default on Pentium M processors is to count both hardware-prefetched and non-hardware-prefetch operations on all (MESI) state lines. (Errata) This event is affected by processor errata E45.

    p6-l2-m-lines-inm
    Count the number of modified lines allocated in L2 cache.
    p6-l2-m-lines-outm [,umask= qualifier ]
    Count the number of L2 M-state lines evicted.

    (Pentium M ) On these processors an additional qualifier may be specified and comprises a list of the following keywords separated by `+' characters:

    both
    Count both hardware-prefetched lines and non-hardware-prefetched lines.
    hw
    Count hardware-prefetched lines only.
    nonhw
    Exclude hardware-prefetched lines.

    The default is to count both hardware-prefetched and non-hardware-prefetch operations. (Errata) This event is affected by processor errata E53.

    p6-l2-rqsts [,umask= qualifier ]
    Count the total number of L2 requests. An additional qualifier may be specified and comprises a list of the following keywords separated by `+' characters:

    e
    Count operations affecting E (exclusive) state lines.
    i
    Count operations affecting I (invalid) state lines.
    m
    Count operations affecting M (modified) state lines.
    s
    Count operations affecting S (shared) state lines.

    The default is to count operations affecting all (MESI) state lines.

    p6-l2-st
    Count the number of L2 data stores. An additional qualifier may be specified and comprises a list of the following keywords separated by `+' characters:

    e
    Count operations affecting E (exclusive) state lines.
    i
    Count operations affecting I (invalid) state lines.
    m
    Count operations affecting M (modified) state lines.
    s
    Count operations affecting S (shared) state lines.

    The default is to count operations affecting all (MESI) state lines.

    p6-ld-blocks
    Count the number of load operations delayed due to store buffer blocks.
    p6-misalign-mem-ref
    Count the number of misaligned data memory references (crossing a 64 bit boundary).
    p6-mmx-assist
    (Pentium II , Pentium III ) Count the number of MMX assists executed.
    p6-mmx-instr-exec
    (Celeron , Pentium II ) Count the number of MMX instructions executed, except MOVQ and MOVD stores from register to memory.
    p6-mmx-instr-ret
    (Pentium II ) Count the number of MMX instructions retired.
    p6-mmx-instr-type-exec [,umask= qualifier ]
    (Pentium II , Pentium III ) Count the number of MMX instructions executed. An additional qualifier may be specified and comprises a list of the following keywords separated by `+' characters:

    pack
    Count MMX pack operation instructions.
    packed-arithmetic
    Count MMX packed arithmetic instructions.
    packed-logical
    Count MMX packed logical instructions.
    packed-multiply
    Count MMX packed multiply instructions.
    packed-shift
    Count MMX packed shift instructions.
    unpack
    Count MMX unpack operation instructions.

    The default is to count all operations.

    p6-mmx-sat-instr-exec
    (Pentium II , Pentium III ) Count the number of MMX saturating instructions executed.
    p6-mmx-uops-exec
    (Pentium II , Pentium III ) Count the number of MMX micro-ops executed.
    p6-mul
    Count the number of integer and floating-point multiplies, including speculative multiplies. This event is only allocated on counter 1.
    p6-partial-rat-stalls
    Count the number of cycles or events for partial stalls.
    p6-resource-stalls
    Count the number of cycles there was a resource related stall of any kind.
    p6-ret-seg-renames
    (Pentium II , Pentium III ) Count the number of segment register rename events retired.
    p6-sb-drains
    Count the number of cycles the store buffer is draining.
    p6-seg-reg-renames [,umask= qualifier ]
    (Pentium II , Pentium III ) Count the number of segment register renames. An additional qualifier may be specified, and comprises a list of the following keywords separated by `+' characters:

    ds
    Count renames for segment register DS.
    es
    Count renames for segment register ES.
    fs
    Count renames for segment register FS.
    gs
    Count renames for segment register GS.

    The default is to count operations affecting all segment registers.

    p6-seg-rename-stalls
    (Pentium II , Pentium III ) Count the number of segment register renaming stalls. An additional qualifier may be specified, and comprises a list of the following keywords separated by `+' characters:

    ds
    Count stalls for segment register DS.
    es
    Count stalls for segment register ES.
    fs
    Count stalls for segment register FS.
    gs
    Count stalls for segment register GS.

    The default is to count operations affecting all the segment registers.

    p6-segment-reg-loads
    Count the number of segment register loads.
    p6-uops-retired
    Count the number of micro-ops retired.

     

    Intel P4 PMCS

    Intel P4 PMCs are present in Intel Pentium 4 and Xeon processors. These PMCs are documented in
    "IA-32 Intel(R) Architecture Software Developer's Manual" "Volume 3: System Programming Guide" "Order Number 245472-012" 2003 "Intel Corporation"
    Further information about using these PMCs may be found in
    "IA-32 Intel(R) Architecture Optimization Guide" 2003 "Order Number 248966-009" "Intel Corporation"
    Some of these events are affected by processor errata described in
    "Intel(R) Pentium(R) 4 Processor Specification Update" "Document Number: 249199-059" "April 2005" "Intel Corporation"

    Event specifiers for Intel P4 PMCs can have the following common qualifiers:

    active= choice
    (On P4 HTT CPUs) Filter event counting based on which logical processors are active. The allowed values of choice are:

    any
    Count when either logical processor is active.
    both
    Count when both logical processors are active.
    none
    Count only when neither logical processor is active.
    single
    Count only when one logical processor is active.

    The default is ``both ''

    cascade
    Configure the PMC to cascade onto its partner. See Sx Cascading P4 PMCs below for more information.
    edge
    Configure the counter to count false to true transitions of the threshold comparision output. This qualifier only takes effect if a threshold qualifier has also been specified.
    complement
    Configure the counter to increment only when the event count seen is less than the threshold qualifier value specified.
    mask= qualifier
    Many event specifiers for Intel P4 PMCs need to be additionally qualified using a mask qualifier. The allowed syntax for these qualifiers is event specific and is described along with the events.
    os
    Configure the PMC to count when the CPL of the processor is 0.
    precise
    Select precise event based sampling. Precise sampling is supported by the hardware for a limited set of events.
    tag= value
    Configure the PMC to tag the internal uop selected by the other fields in this event specifier with value value This feature is used when cascading PMCs.
    threshold= value
    Configure the PMC to increment only when the event counts seen are greater than the specified threshold value value
    usr
    Configure the PMC to count when the CPL of the processor is 1, 2 or 3.

    If neither of the ``os '' or ``usr '' qualifiers are specified, the default is to enable both.

    On Intel Pentium 4 processors with HTT, events are divided into two classes:

    "TS Events"
    are those where hardware can differentiate between events generated on one logical processor from those generated on the other.
    "TI Events"
    are those where hardware cannot differentiate between events generated by multiple logical processors in a package.

    Only TS events are allowed for use with process-mode PMCs on Pentium-4/HTT CPUs.

    The event specifiers supported by Intel P4 PMCs are:

    p4-128bit-mmx-uop [,mask= flags ]
    (TI event) Count integer SIMD SSE2 instructions that operate on 128 bit SIMD operands. Qualifier flags can take the following value (which is also the default):

    all
    Count all uops operating on 128 bit SIMD integer operands in memory or XMM register.

    If an instruction contains more than one 128 bit MMX uop, then each uop will be counted.

    p4-64bit-mmx-uop [,mask= flags ]
    (TI event) Count MMX instructions that operate on 64 bit SIMD operands. Qualifier flags can take the following value (which is also the default):

    all
    Count all uops operating on 64 bit SIMD integer operands in memory or in MMX registers.

    If an instruction contains more than one 64 bit MMX uop, then each uop will be counted.

    p4-b2b-cycles
    (TI event) Count back-to-back bys cycles. Further documentation for this event is unavailable.
    p4-bnr
    (TI event) Count bus-not-ready conditions. Further documentation for this event is unavailable.
    p4-bpu-fetch-request [,mask= qualifier ]
    (TS event) Count instruction fetch requests qualified by additional flags specified in qualifier At this point only one flag is supported:

    tcmiss
    Count trace cache lookup misses.

    The default qualifier is also ``mask=tcmiss ''

    p4-branch-retired [,mask= flags ]
    (TS event) Counts retired branches. Qualifier flags is a list of the following `+' separated strings:

    mmnp
    Count branches not-taken and predicted.
    mmnm
    Count branches not-taken and mis-predicted.
    mmtp
    Count branches taken and predicted.
    mmtm
    Count branches taken and mis-predicted.

    The default qualifier counts all four kinds of branches.

    p4-bsq-active-entries [,mask= qualifier ]
    (TS event) Count the number of entries (clipped at 15) currently active in the BSQ. Qualifier qualifier is a `+' separated set of the following flags:

    req-type0 , req-type1
    Forms a 2-bit number used to select the request type encoding:

    0
    reads excluding read invalidate
    1
    read invalidates
    2
    writes other than writebacks
    3
    writebacks

    Bit ``req-type1 '' is the MSB for this two bit number.

    req-len0 , req-len1
    Forms a two-bit number that specifies the request length encoding:

    0
    0 chunks
    1
    1 chunk
    3
    8 chunks

    Bit ``req-len1 '' is the MSB for this two bit number.

    req-io-type
    Count requests that are input or output requests.
    req-lock-type
    Count requests that lock the bus.
    req-lock-cache
    Count requests that lock the cache.
    req-split-type
    Count requests that is a bus 8-byte chunk that is split across an 8-byte boundary.
    req-dem-type
    Count requests that are demand (not prefetches) if set. Count requests that are prefetches if not set.
    req-ord-type
    Count requests that are ordered.
    mem-type0 , mem-type1 , mem-type2
    Forms a 3-bit number that specifies a memory type encoding:

    0
    UC
    1
    USWC
    4
    WT
    5
    WP
    6
    WB

    Bit ``mem-type2 '' is the MSB of this 3-bit number.

    The default qualifier has all the above bits set.

    Edge triggering using the ``edge '' qualifier should not be used with this event when counting cycles.

    p4-bsq-allocation [,mask= qualifier ]
    (TS event) Count allocations in the bus sequence unit according to the flags specified in qualifier which is a `+' separated set of the following flags:

    req-type0 , req-type1
    Forms a 2-bit number used to select the request type encoding:

    0
    reads excluding read invalidate
    1
    read invalidates
    2
    writes other than writebacks
    3
    writebacks

    Bit ``req-type1 '' is the MSB for this two bit number.

    req-len0 , req-len1
    Forms a two-bit number that specifies the request length encoding:

    0
    0 chunks
    1
    1 chunk
    3
    8 chunks

    Bit ``req-len1 '' is the MSB for this two bit number.

    req-io-type
    Count requests that are input or output requests.
    req-lock-type
    Count requests that lock the bus.
    req-lock-cache
    Count requests that lock the cache.
    req-split-type
    Count requests that is a bus 8-byte chunk that is split across an 8-byte boundary.
    req-dem-type
    Count requests that are demand (not prefetches) if set. Count requests that are prefetches if not set.
    req-ord-type
    Count requests that are ordered.
    mem-type0 , mem-type1 , mem-type2
    Forms a 3-bit number that specifies a memory type encoding:

    0
    UC
    1
    USWC
    4
    WT
    5
    WP
    6
    WB

    Bit ``mem-type2 '' is the MSB of this 3-bit number.

    The default qualifier has all the above bits set.

    This event is usually used along with the ``edge '' qualifier to avoid multiple counting.

    p4-bsq-cache-reference [,mask= qualifier ]
    (TS event) Count cache references as seen by the bus unit (2nd or 3rd level cache references). Qualifier qualifier is a `+' separated list of the following keywords:

    rd-2ndl-hits
    Count 2nd level cache hits in the shared state.
    rd-2ndl-hite
    Count 2nd level cache hits in the exclusive state.
    rd-2ndl-hitm
    Count 2nd level cache hits in the modified state.
    rd-3rdl-hits
    Count 3rd level cache hits in the shared state.
    rd-3rdl-hite
    Count 3rd level cache hits in the exclusive state.
    rd-3rdl-hitm
    Count 3rd level cache hits in the modified state.
    rd-2ndl-miss
    Count 2nd level cache misses.
    rd-3rdl-miss
    Count 3rd level cache misses.
    wr-2ndl-miss
    Count write-back lookups from the data access cache that miss the 2nd level cache.

    The default is to count all the above events.

    p4-execution-event [,mask= flags ]
    (TS event) Count the retirement of tagged uops selected through the execution tagging mechanism. Qualifier flags can contain the following strings separated by `+' characters:

    nbogus0 , nbogus1 , nbogus2 , nbogus3
    The marked uops are not bogus.
    bogus0 , bogus1 , bogus2 , bogus3
    The marked uops are bogus.

    This event requires additional (upstream) events to be allocated to perform the desired uop tagging. The default is to set all the above flags. This event can be used for precise event based sampling.

    p4-front-end-event [,mask= flags ]
    (TS event) Count the retirement of tagged uops selected through the front-end tagging mechanism. Qualifier flags can contain the following strings separated by `+' characters:

    nbogus
    The marked uops are not bogus.
    bogus
    The marked uops are bogus.

    This event requires additional (upstream) events to be allocated to perform the desired uop tagging. The default is to select both kinds of events. This event can be used for precise event based sampling.

    p4-fsb-data-activity [,mask= flags ]
    (TI event) Count each DBSY or DRDY event selected by qualifier flags Qualifier flags is a `+' separated set of the following flags:

    drdy-drv
    Count when this processor is driving data onto the bus.
    drdy-own
    Count when this processor is reading data from the bus.
    drdy-other
    Count when data is on the bus but not being sampled by this processor.
    dbsy-drv
    Count when this processor reserves the bus for use in the next cycle in order to drive data.
    dbsy-own
    Count when some agent reserves the bus for use in the next bus cycle to drive data that this processor will sample.
    dbsy-other
    Count when some agent reserves the bus for use in the next bus cycle to drive data that this processor will not sample.

    Flags ``drdy-own '' and ``drdy-other '' are mutually exclusive. Flags ``dbsy-own '' and ``dbsy-other '' are mutually exclusive. The default value for qualifier is ``drdy-drv+drdy-own+dbsy-drv+dbsy-own ''

    p4-global-power-events [,mask= flags ]
    (TS event) Count cycles during which the processor is not stopped. Qualifier flags can take the following value (which is also the default):

    running
    Count cycles when the processor is active.

    p4-instr-retired [,mask= flags ]
    (TS event) Count instructions retired during a clock cycle. Qualifer flags comprises of the following strings separated by `+' characters:

    nbogusntag
    Count non-bogus instructions that are not tagged.
    nbogustag
    Count non-bogus instructions that are tagged.
    bogusntag
    Count bogus instructions that are not tagged.
    bogustag
    Count bogus instructions that are tagged.

    The default qualifier counts all the above kinds of instructions.

    p4-ioq-active-entries [,mask= qualifier ] [,busreqtype= req-type ]
    (TS event)
    Count the number of entries (clipped at 15) in the IOQ that are active. The event masks are specified by qualifier qualifier and req-type

    Qualifier qualifier is a `+' separated set of the following flags:

    all-read
    Count read entries.
    all-write
    Count write entries.
    mem-uc
    Count entries accessing uncacheable memory.
    mem-wc
    Count entries accessing write-combining memory.
    mem-wt
    Count entries accessing write-through memory.
    mem-wp
    Count entries accessing write-protected memory
    mem-wb
    Count entries accessing write-back memory.
    own
    Count store requests driven by the processor (i.e., not by other processors or by DMA).
    other
    Count store requests driven by other processors or by DMA.
    prefetch
    Include hardware and software prefetch requests in the count.

    The default value for qualifier is to enable all the above flags.

    The req-type qualifier is a 5-bit number can be additionally used to select a specific bus request type. The default is 0.

    The ``edge '' qualifier should not be used when counting cycles with this event. The exact behaviour of this event depends on the processor revision.

    p4-ioq-allocation [,mask= qualifier ] [,busreqtype= req-type ]
    (TS event)
    Count various types of transactions on the bus matching the flags set in qualifier and req-type

    Qualifier qualifier is a `+' separated set of the following flags:

    all-read
    Count read entries.
    all-write
    Count write entries.
    mem-uc
    Count entries accessing uncacheable memory.
    mem-wc
    Count entries accessing write-combining memory.
    mem-wt
    Count entries accessing write-through memory.
    mem-wp
    Count entries accessing write-protected memory
    mem-wb
    Count entries accessing write-back memory.
    own
    Count store requests driven by the processor (i.e., not by other processors or by DMA).
    other
    Count store requests driven by other processors or by DMA.
    prefetch
    Include hardware and software prefetch requests in the count.

    The default value for qualifier is to enable all the above flags.

    The req-type qualifier is a 5-bit number can be additionally used to select a specific bus request type. The default is 0.

    The ``edge '' qualifier is normally used with this event to prevent multiple counting. The exact behaviour of this event depends on the processor revision.

    p4-itlb-reference [mask= qualifier ]
    (TS event) Count translations using the intruction translation look-aside buffer. The qualifier argument is a list of the following strings separated by `+' characters.

    hit
    Count ITLB hits.
    miss
    Count ITLB misses.
    hit-uc
    Count uncacheable ITLB hits.

    If no qualifier is specified the default is to count all the three kinds of ITLB translations.

    p4-load-port-replay [,mask= qualifier ]
    (TS event) Count replayed events at the load port. Qualifier qualifier can take on one value:

    split-ld
    Count split loads.

    The default value for qualifier is ``split-ld ''

    p4-mispred-branch-retired [,mask= flags ]
    (TS event) Count mispredicted IA-32 branch instructions. Qualifier flags can take the following value (which is also the default):

    nbogus
    Count non-bogus retired branch instructions.

    p4-machine-clear [,mask= flags ]
    (TS event) Count the number of pipeline clears seen by the processor. Qualifer flags is a list of the following strings separated by `+' characters:

    clear
    Count for a portion of the many cycles when the machine is being cleared for any reason.
    moclear
    Count machine clears due to memory ordering issues.
    smclear
    Count machine clears due to self-modifying code.

    Use qualifier ``edge '' to get a count of occurrences of machine clears. The default qualifier is ``clear ''

    p4-memory-cancel [,mask= event-list ]
    (TS event) Count the cancelling of various kinds of requests in the data cache address control unit of the CPU. The qualifier event-list is a list of the following strings separated by `+' characters:

    st-rb-full
    Requests cancelled because no store request buffer was available.
    64k-conf
    Requests that conflict due to 64K aliasing.

    If event-list is not specified, then the default is to count both kinds of events.

    p4-memory-complete [,mask= event-list ]
    (TS event) Count the completion of load split, store split, uncacheable split and uncacheable load operations selected by qualifier event-list The qualifier event-list is a `+' separated list of the following flags:

    lsc
    Count load splits completed, excluding loads from uncacheable or write-combining areas.
    ssc
    Count any split stores completed.

    The default is to count both kinds of operations.

    p4-mob-load-replay [,mask= qualifier ]
    (TS event) Count load replays triggered by the memory order buffer. Qualifier qualifier can be a `+' separated list of the following flags:

    no-sta
    Count replays because of unknown store addresses.
    no-std
    Count replays because of unknown store data.
    partial-data
    Count replays because of partially overlapped data accesses between load and store operations.
    unalgn-addr
    Count replays because of mismatches in the lower 4 bits of load and store operations.

    The default qualifier is no-sta+no-std+partial-data+unalgn-addr

    p4-packed-dp-uop [,mask= flags ]
    (TI event) Count packed double-precision uops. Qualifier flags can take the following value (which is also the default):

    all
    Count all uops operating on packed double-precision operands.

    p4-packed-sp-uop [,mask= flags ]
    (TI event) Count packed single-precision uops. Qualifier flags can take the following value (which is also the default):

    all
    Count all uops operating on packed single-precision operands.

    p4-page-walk-type [,mask= qualifier ]
    (TI event) Count page walks performed by the page miss handler. Qualifier qualifier can be a `+' separated list of the following keywords:

    dtmiss
    Count page walks for data TLB misses.
    itmiss
    Count page walks for instruction TLB misses.

    The default value for qualifier is ``dtmiss+itmiss ''

    p4-replay-event [,mask= flags ]
    (TS event) Count the retirement of tagged uops selected through the replay tagging mechanism. Qualifier flags contains a `+' separated set of the following strings:

    nbogus
    The marked uops are not bogus.
    bogus
    The marked uops are bogus.

    This event requires additional (upstream) events to be allocated to perform the desired uop tagging. The default qualifier counts both kinds of uops. This event can be used for precise event based sampling.

    p4-resource-stall [,mask= flags ]
    (TS event) Count the occurrence or latency of stalls in the allocator. Qualifier flags can take the following value (which is also the default):

    sbfull
    A stall due to the lack of store buffers.

    p4-response
    (TI event) Count different types of responses. Further documentation on this event is not available.
    p4-retired-branch-type [,mask= flags ]
    (TS event) Count branches retired. Qualifier flags contains a `+' separated list of strings:

    conditional
    Count conditional jumps.
    call
    Count direct and indirect call branches.
    return
    Count return branches.
    indirect
    Count returns, indirect calls or indirect jumps.

    The default qualifier counts all the above branch types.

    p4-retired-mispred-branch-type [,mask= flags ]
    (TS event) Count mispredicted branches retired. Qualifier flags contains a `+' separated list of strings:

    conditional
    Count conditional jumps.
    call
    Count indirect call branches.
    return
    Count return branches.
    indirect
    Count returns, indirect calls or indirect jumps.

    The default qualifier counts all the above branch types.

    p4-scalar-dp-uop [,mask= flags ]
    (TI event) Count the number of scalar double-precision uops. Qualifier flags can take the following value (which is also the default):

    all
    Count the number of scalar double-precision uops.

    p4-scalar-sp-uop [,mask= flags ]
    (TI event) Count the number of scalar single-precision uops. Qualifier flags can take the following value (which is also the default):

    all
    Count all uops operating on scalar single-precision operands.

    p4-snoop
    (TI event) Count snoop traffic. Further documentation on this event is not available.
    p4-sse-input-assist [,mask= flags ]
    (TI event) Count the number of times an assist is required to handle problems with the operands for SSE and SSE2 operations. Qualifier flags can take the following value (which is also the default):

    all
    Count assists for all SSE and SSE2 uops.

    p4-store-port-replay [,mask= qualifier ]
    (TS event) Count events replayed at the store port. Qualifier qualifier can take on one value:

    split-st
    Count split stores.

    The default value for qualifier is ``split-st ''

    p4-tc-deliver-mode [,mask= qualifier ]
    (TI event) Count the duration in cycles of operating modes of the trace cache and decode engine. The desired operating mode is selected by qualifier which is a list of the following strings separated by `+' characters:

    DD
    Both logical processors are in deliver mode.
    DB
    Logical processor 0 is in deliver mode while logical processor 1 is in build mode.
    DI
    Logical processor 0 is in deliver mode while logical processor 1 is halted, or in machine clear, or transitioning to a long microcode flow.
    BD
    Logical processor 0 is in build mode while logical processor 1 is in deliver mode.
    BB
    Both logical processors are in build mode.
    BI
    Logical processor 0 is in build mode while logical processor 1 is halted, or in machine clear or transitioning to a long microcode flow.
    ID
    Logical processor 0 is halted, or in machine clear or transitioning to a long microcode flow while logical processor 1 is in deliver mode.
    IB
    Logical processor 0 is halted, or in machine clear or transitioning to a long microcode flow while logical processor 1 is in build mode.

    If there is only one logical processor in the processor package then the qualifier for logical processor 1 is ignored. If no qualifier is specified, the default qualifier is ``DD+DB+DI+BD+BB+BI+ID+IB ''

    p4-tc-ms-xfer [,mask= flags ]
    (TI event) Count the number of times uop delivery changed from the trace cache to MS ROM. Qualifier flags can take the following value (which is also the default):

    cisc
    Count TC to MS transfers.

    p4-uop-queue-writes [,mask= flags ]
    (TS event) Count the number of valid uops written to the uop queue. Qualifier flags is a list of the following strings, separated by `+' characters:

    from-tc-build
    Count uops being written from the trace cache in build mode.
    from-tc-deliver
    Count uops being written from the trace cache in deliver mode.
    from-rom
    Count uops being written from microcode ROM.

    The default qualifier counts all the above kinds of uops.

    p4-uop-type [,mask= flags ]
    (TS event) This event is used in conjunction with the front-end at-retirement mechanism to tag load and store uops. Qualifer flags comprises the following strings separated by `+' characters:

    tagloads
    Mark uops that are load operations.
    tagstores
    Mark uops that are store operations.

    The default qualifier counts both kinds of uops.

    p4-uops-retired [,mask= flags ]
    (TS event) Count uops retired during a clock cycle. Qualifier flags comprises the following strings separated by `+' characters:

    nbogus
    Count marked uops that are not bogus.
    bogus
    Count marked uops that are bogus.

    The default qualifier counts both kinds of uops.

    p4-wc-buffer [,mask= flags ]
    (TI event) Count write-combining buffer operations. Qualifier flags contains the following strings separated by `+' characters:

    wcb-evicts
    WC buffer evictions due to any cause.
    wcb-full-evict
    WC buffer evictions due to no WC buffer being available.

    The default qualifer counts both kinds of evictions.

    p4-x87-assist [,mask= flags ]
    (TS event) Count the retirement of x87 instructions that required special handling. Qualifier flags contains the following strings separated by `+' characters:

    fpsu
    Count instructions that saw an FP stack underflow.
    fpso
    Count instructions that saw an FP stack overflow.
    poao
    Count instructions that saw an x87 output overflow.
    poau
    Count instructions that saw an x87 output underflow.
    prea
    Count instructions that needed an x87 input assist.

    The default qualifier counts all the above types of instruction retirements.

    p4-x87-fp-uop [,mask= flags ]
    (TI event) Count x87 floating-point uops. Qualifier flags can take the following value (which is also the default):

    all
    Count all x87 floating-point uops.

    If an instruction contains more than one x87 floating-point uops, then all x87 floating-point uops will be counted. This event does not count x87 floating-point data movement operations.

    p4-x87-simd-moves-uop [,mask= flags ]
    (TI event) Count each x87 FPU, MMX, SSE, or SSE2 uops that load data or store data or perform register-to-register moves. This event does not count integer move uops. Qualifier flags may contain the following keywords separated by `+' characters:

    allp0
    Count all x87 and SIMD store and move uops.
    allp2
    Count all x87 and SIMD load uops.

    The default is to count all uops. (Errata) This event may be affected by processor errata N43.

     

    Cascading P4 PMCs

    PMC cascading support is currently poorly implemented. While individual event counters may be allocated with a ``cascade '' qualifier, the current API does not offer the ability to name and allocate all the resources needed for a cascaded event counter pair in a single operation.  

    Precise Event Based Sampling

    Support for precise event based sampling is currently unimplemented in hwpmc(4).  

    IMPLEMENTATION NOTES

    On the i386 architecture, Fx has historically allowed the use of the RDTSC instruction from user-mode (i.e., at a processor CPL of 3) by any process. This behaviour is preserved by hwpmc(4).  

    RETURN VALUES

    The pmc_name_of_capability (,);
    pmc_name_of_class (,);
    pmc_name_of_cputype (,);
    pmc_name_of_disposition (,);
    pmc_name_of_event (,);
    pmc_name_of_mode (,);
    and pmc_name_of_state ();
    functions return a pointer to the human readable form of their argument. These pointers may point to statically allocated storage and must not be passed to free (.);
    In case of an error, these functions return NULL and set the global variable errno

    The functions pmc_ncpu ();
    and pmc_npmc ();
    return the number of CPUs and number of PMCs configured respectively; in case of an error they return the value -1 and set the global variable errno

    All other functions return the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.  

    COMPATIBILITY

    The interface between the pmc library and the hwpmc(4) driver is intended to be private to the implementation and may change. In order to ease forward compatibility with future versions of the hwpmc(4) driver, applications are urged to dynamically link with the pmc library.

    The pmc API is Ud  

    ERRORS

    A call to pmc_init ();
    may fail with the following errors in addition to those returned by modfind(2), modstat(2) and hwpmc(4):

    Bq Er ENXIO
    An unknown CPU type was encountered during initialization.
    Bq Er EPROGMISMATCH
    The version number of the hwpmc(4) kernel module did not match that compiled into the pmc library.

    A call to pmc_capabilities (,);
    pmc_name_of_capability (,);
    pmc_name_of_disposition (,);
    pmc_name_of_state (,);
    pmc_name_of_event (,);
    pmc_name_of_mode ();
    pmc_name_of_class ();
    and pmc_width ();
    may fail with the following error:

    Bq Er EINVAL
    An invalid argument was passed to the function.

    A call to pmc_cpuinfo ();
    or pmc_ncpu ();
    may fail with the following error:

    Bq Er ENXIO
    The pmc has not been initialized.

    A call to pmc_npmc ();
    may fail with the following errors:

    Bq Er EINVAL
    The argument passed in was out of range.
    Bq Er ENXIO
    The pmc library has not been initialized.

    A call to pmc_pmcinfo ();
    may fail with the following errors, in addition to those returned by hwpmc(4):

    Bq Er ENXIO
    The pmc library is not yet initialized.

    A call to pmc_allocate ();
    may fail with the following errors, in addition to those returned by hwpmc(4):

    Bq Er EINVAL
    The Fa mode argument passed in had an illegal value, or the event specification Fa ctrspec was unrecognized for this CPU type.

    Calls to pmc_attach (,);
    pmc_configure_logfile (,);
    pmc_detach (,);
    pmc_disable (,);
    pmc_enable (,);
    pmc_get_driver_stats (,);
    pmc_get_msr (,);
    pmc_read (,);
    pmc_release (,);
    pmc_rw (,);
    pmc_set (,);
    pmc_start (,);
    pmc_stop (,);
    pmc_write (,);
    and pmc_writelog ();
    may fail with the errors described in hwpmc(4).

    If a log file was configured using pmc_configure_logfile ();
    and the hwpmc(4) driver encountered an error while logging data to it, then logging will be stopped and a subsequent call to pmc_flush_logfile ();
    will fail with the error code seen by the hwpmc(4) driver.  

    SEE ALSO

    modfind(2), modstat(2), calloc(3), pmclog(3), hwpmc(4), pmccontrol(8), pmcstat(8)  

    HISTORY

    The pmc library first appeared in Fx 6.0 .  

    BUGS

    The information returned by pmc_cpuinfo (,);
    pmc_ncpu ();
    and possibly pmc_npmc ();
    should really be available all the time, through a better designed interface and not just when hwpmc(4) is present in the kernel.


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    Application Programming Interface
    Signal Handling Requirements
    Convenience Functions
    Administration
    x86 Architecture Specific API
    EVENT SPECIFIERS
    Event Name Aliases
    Time Stamp Counter (TSC)
    AMD (K7) PMCs
    AMD (K8) PMCs
    Intel P6 PMCS
    Intel P4 PMCS
    Cascading P4 PMCs
    Precise Event Based Sampling
    IMPLEMENTATION NOTES
    RETURN VALUES
    COMPATIBILITY
    ERRORS
    SEE ALSO
    HISTORY
    BUGS


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