Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization
From: Roman Kagan <hidden>
Date: 2016-03-10 09:30:38
Also in:
kvm, linux-mm, lkml, qemu-devel
On Wed, Mar 09, 2016 at 02:38:52PM -0500, Rik van Riel wrote:
On Wed, 2016-03-09 at 20:04 +0300, Roman Kagan wrote:quoted
On Wed, Mar 09, 2016 at 05:41:39PM +0200, Michael S. Tsirkin wrote:quoted
On Wed, Mar 09, 2016 at 05:28:54PM +0300, Roman Kagan wrote:quoted
For (1) I've been trying to make a point that skipping clean pages is much more likely to result in noticable benefit than free pages only.I guess when you say clean you mean zero?No I meant clean, i.e. those that could be evicted from RAM without causing I/O.Programs in the guest may have that memory mmapped. This could include things like libraries and executables. How do you deal with the guest page cache containing references to now non-existent memory? How do you re-populate the memory on the destination host?
I guess the confusion is due to the context I stripped from the previous messages... Actually I've been talking about doing full-fledged balloon inflation before the migration, so, when it's deflated the guest will fault in that data from the filesystem as usual. Roman.