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Message-ID: <CAJcbSZFJQMKw21kLwr4QGoSM7DMgKRzzjWxkYBF2c1HciCzvGg@mail.gmail.com>
Date: Fri, 25 Aug 2017 08:05:52 -0700
From: Thomas Garnier <thgarnie@...gle.com>
To: Ingo Molnar <mingo@...nel.org>
Cc: Herbert Xu <herbert@...dor.apana.org.au>, "David S . Miller" <davem@...emloft.net>,
Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H . Peter Anvin" <hpa@...or.com>,
Peter Zijlstra <peterz@...radead.org>, Josh Poimboeuf <jpoimboe@...hat.com>,
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Subject: Re: x86: PIE support and option to extend KASLR randomization
On Fri, Aug 25, 2017 at 1:04 AM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Thomas Garnier <thgarnie@...gle.com> wrote:
>
>> With the fix for function tracing, the hackbench results have an
>> average of +0.8 to +1.4% (from +8% to +10% before). With a default
>> configuration, the numbers are closer to 0.8%.
>>
>> On the .text size, with gcc 4.9 I see +0.8% on default configuration
>> and +1.180% on the ubuntu configuration.
>
> A 1% text size increase is still significant. Could you look at the disassembly,
> where does the size increase come from?
I will take a look, in this current iteration I added the .got and
.got.plt so removing them will remove a big (even if they are small,
we don't use them to increase perf).
What do you think about the perf numbers in general so far?
>
> Thanks,
>
> Ingo
--
Thomas
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