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Message-ID: <20170824210700.5fd3b5a0@gandalf.local.home>
Date: Thu, 24 Aug 2017 21:07:00 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Thomas Garnier <thgarnie@...gle.com>
Cc: Ingo Molnar <mingo@...nel.org>, Herbert Xu
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Subject: Re: x86: PIE support and option to extend KASLR randomization
On Thu, 24 Aug 2017 14:13:38 -0700
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%.
Wow, an empty fentry function not "nop"ed out only added 8% to 10%
overhead. I never did the benchmarks of that since I did it before
fentry was introduced, which was with the old "mcount". That gave an
average of 13% overhead in hackbench.
-- Steve
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