Avi Kivity wrote: > Rusty Russell wrote: >> After discussions with Anthony Liguori, it seems that the virtio >> balloon can be made even simpler. Here's my attempt. >> >> Since the balloon requires Guest cooperation anyway, there seems >> little reason to force it to tell the Host when it wants to reuse a >> page. It can simply fault it in. >> >> > > Faulting is synchronous, while deflating is (or can be made) > asynchronous. If the host needs to do some work to get the memory, the > guest will be slowed down considerably.
Good point. Basically, we have two page hinting operations which roughly correspond to madvise(MADV_DONTNEED) and madvise(MADV_WILLNEED). Regards, Anthony Liguori > If we have explicit deflate, the host can call madvise(MADV_WILLNEED) or > actually touch the pages before the guest accesses them. > > ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
