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

[Kirill A. Shutemov]

On Fri, Sep 4, 2009 at 10:51 AM, Reimar
Döffinger<address@hidden> 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
>> 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.
>

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