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Re: [Qemu-devel] [RESEND][PATCH 1.7] migration: drop MADVISE_DONT_NEED f


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [RESEND][PATCH 1.7] migration: drop MADVISE_DONT_NEED for incoming zero pages
Date: Thu, 24 Oct 2013 10:14:23 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130923 Thunderbird/17.0.9

Il 24/10/2013 08:21, Peter Lieven ha scritto:
> Additionally we memmap target memory so it is essentially
> zero initialized (except for e.g. option roms and bios which are loaded
> into target memory although they shouldn't).
> 
> It was reported recently that this madvise causes a performance degradation
> in some situations. As the madvise should only be called rarely and if it's 
> called
> it is likely on a busy page (it was non-zero and changed to zero during 
> migration)
> drop it completely.

Tagging this patch for 1.7.

Paolo



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