From: Peter Lieven <pl@kamp.de>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: haoyu.zhang@huawei.com, xiaoguangrong@linux.vnet.ibm.com,
qemu-devel@nongnu.org, afaerber@suse.de, quintela@redhat.com
Subject: Re: [Qemu-devel] [RESEND][PATCH 1.7] migration: drop MADVISE_DONT_NEED for incoming zero pages
Date: Mon, 18 Nov 2013 13:48:04 +0100 [thread overview]
Message-ID: <528A0C84.6080809@kamp.de> (raw)
In-Reply-To: <5268E4EF.3090007@redhat.com>
On 24.10.2013 11:14, Paolo Bonzini wrote:
> 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.
has this been merged?
Peter
next prev parent reply other threads:[~2013-11-18 12:48 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-24 7:21 [Qemu-devel] [RESEND][PATCH] migration: drop MADVISE_DONT_NEED for incoming zero pages Peter Lieven
2013-10-24 9:14 ` [Qemu-devel] [RESEND][PATCH 1.7] " Paolo Bonzini
2013-11-18 12:48 ` Peter Lieven [this message]
2013-11-18 16:10 ` Paolo Bonzini
2013-10-24 10:07 ` [Qemu-devel] [RESEND][PATCH] " Juan Quintela
2013-11-04 9:29 ` Peter Lieven
2013-10-30 3:08 ` Zhanghaoyu (A)
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