Исходное сообщение
"Intel представил инструментарий Clear Containers 3.0, перепи..." Отправлено Аноним, 23-Сен-17 23:16
по той же ссылке на lwn.net написано: >[оверквотинг удален] >in the ext4 filesystem. If your storage is visible as regular memory to the host CPU, DAX >enables the system to do execute-in-place of files stored there. In other words, when >using DAX, you bypass the page cache and virtual-memory subsystem completely. For >applications that use mmap(), this means a true zero-copy approach, and for code that >uses the read() system call (or equivalent) you will have only one copy of the data. DAX >was originally designed for fast flash-like storage that shows up as memory to the CPU; >but in a virtual-machine environment, this type of storage is easy to emulate. All we >need to do on the host is map the disk image file into the guest's physical memory, and >use a small device driver in the guest kernel that exposes this memory region to the >kernel as a DAX-ready block device. На всякий случай еще раз повторю: > For applications that use mmap(), this means a true zero-copy approach, and for code > that uses the read() system call (or equivalent) you will have only one copy of the data.