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Date: Fri, 4 Sep 2009 11:03:52 +0300
Message-ID: <cc557aab0909040103rb665d6i8e169036c18f2dd5@mail.gmail.com>
Subject: Re: [Qemu-devel] [PATCH v2] Build *-user targets as PIE
From: "Kirill A. Shutemov" <kirill@shutemov.name>
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To: qemu-devel@nongnu.org

On Fri, Sep 4, 2009 at 10:51 AM, Reimar
D=C3=B6ffinger<Reimar.Doeffinger@gmx.de> wrote:
> On Fri, Sep 04, 2009 at 07:33:25AM +0300, Kirill A. Shutemov wrote:
>> On Thu, Sep 3, 2009 at 8:17 PM, Reimar
>> D=C3=B6ffinger<Reimar.Doeffinger@gmx.de> wrote:
>> > It is close to getting of topic, but since you state it, why try so ha=
rd
>> > to avoid text relocations?
>> > Sure, there are advantages (the biggest one is less issues with
>> > mis-/insufficiently configured selinux I think), possibly better shari=
ng
>> > of pages when many instances are run and better delayed loading, but o=
n
>> > 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 diff=
erent
> situation) it could be about 10 % when I last did some tests.
>

My patch compile only usermode targets as PIE, so it will not affect KVM.