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...s. If I compare with patchset by 'Wei', host gets/asks free page hints and ignore such pages during live migration. But as already discussed, if free pages are still in guest memory there is no point of traversing & getting all such pages again. [1] https://www.spinics.net/lists/kvm/msg159790.html > > How about rotating these pages towards the end of the list? > Probably not on each call, callect reported pages and then > move them to tail when we exit. > > Of course it's possible not all reporters want this. > So maybe change the callback to return int: >...

On Wed, Jan 24, 2018 at 06:42:41PM +0800, Wei Wang wrote: > This patch adds support to walk through the free page blocks in the > system and report them via a callback function. Some page blocks may > leave the free list after zone->lock is released, so it is the caller's > responsibility to either detect or prevent the use of such pages. > > One use example of this patch

On Wed, Jan 24, 2018 at 06:42:41PM +0800, Wei Wang wrote: > This patch adds support to walk through the free page blocks in the > system and report them via a callback function. Some page blocks may > leave the free list after zone->lock is released, so it is the caller's > responsibility to either detect or prevent the use of such pages. > > One use example of this patch