|
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
[Prev in Thread] | Current Thread | [Next in Thread] |