Marcelo Tosatti wrote:
Hi Anthony,
On Mon, Aug 18, 2008 at 05:04:25PM -0500, Anthony Liguori wrote:
Attached is an updated migration patch. It does not appear, however,
that madvise() is triggering discarding of pages even with an
MMU-notifier enabled kernel. I take it that this is because we're still
holding a reference count to the page when it is in the shadow page
table? Any ETA on when this will change?
Shadow references should be dropped via kvm_unmap_rmapp -> rmap_remove.
So the symptom is that RSS for the task does not decrease accordingly to
the ballooned down size?
Correct. I run a workload in the guest to touch all of memory, watch
the RSS size go up to 1G, then balloon down to 512mb. I don't see the
RSS size reduce at all though.
This is not the case when just using QEMU. When I get a chance to
debug, the next step will be to annotate the code to see whether
rmap_remove is actually being invoked on madvise().
Regards,
Anthony Liguori
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