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Re: [Qemu-devel] [PATCH v2] Build *-user targets as PIE


From: Reimar Döffinger
Subject: Re: [Qemu-devel] [PATCH v2] Build *-user targets as PIE
Date: Fri, 4 Sep 2009 09:51:43 +0200
User-agent: Mutt/1.5.20 (2009-06-14)

On Fri, Sep 04, 2009 at 07:33:25AM +0300, Kirill A. Shutemov wrote:
> On Thu, Sep 3, 2009 at 8:17 PM, Reimar
> Döffinger<address@hidden> wrote:
> > It is close to getting of topic, but since you state it, why try so hard
> > to avoid text relocations?
> > Sure, there are advantages (the biggest one is less issues with
> > mis-/insufficiently configured selinux I think), possibly better sharing
> > of pages when many instances are run and better delayed loading, but on
> > x86/i386 that doesn't sound like a clear advantage compared to the in
> > some cases quite relevant speed loss.
> 
> Do you have any numbers about speed loss?

No, I was getting a bit off-topic. At least with KVM I doubt there
is any relevant speed loss for qemu, though for MPlayer/FFmpeg (very different
situation) it could be about 10 % when I last did some tests.




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