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Re: [Qemu-devel] broken incoming migration

From: Paolo Bonzini
Subject: Re: [Qemu-devel] broken incoming migration
Date: Tue, 04 Jun 2013 17:17:01 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130514 Thunderbird/17.0.6

Il 04/06/2013 16:48, Peter Lieven ha scritto:
> Still using 3.2, but strange enough the above example is also not
> increasing RSS size for me.
> Can you try the following:
> qemu git master with 1G of memory (hanging in bios with no boot device)
> and migrate it. Before migration RSS Size os somewhat
> around 16MB. After migration its RSS size is in the order of 1G.

That may be a kernel bug.  The kernel did not do the copy-on-write trick
on huge zero pages.  It was fixed last year, maybe 3.2 is not enough.
Try adding a MADV_HUGEPAGE madvise to the testcase and see if it reproduces.


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