On Wed, Sep 15, 2010 at 19:58, Avi Kivity <avi@xxxxxxxxxx> wrote: > Instead of those two syscalls, how about a vmfd(pid_t pid, ulong start, > ulong len) system call which returns an file descriptor that represents a > portion of the process address space. You can then use preadv() and > pwritev() to copy memory, and io_submit(IO_CMD_PREADV) and > io_submit(IO_CMD_PWRITEV) for asynchronous variants (especially useful with > a dma engine, since that adds latency). > > With some care (and use of mmu_notifiers) you can even mmap() your vmfd and > access remote process memory directly. Rather than introducing a new vmfd() API for this, why not just add implementations for these more efficient operations to the existing /proc/$pid/mem interface? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href