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Date: Sat, 9 Feb 2019 11:38:00 +0000
From: "Reshetova, Elena" <>
To: Peter Zijlstra <>
CC: ""
	<>, "" <>,
	"" <>, ""
	<>, "" <>, ""
	<>, "" <>
Subject: RE: [RFC PATCH] x86/entry/64: randomize kernel stack offset upon
 system call

 On Fri, Feb 08, 2019 at 01:20:09PM +0000, Reshetova, Elena wrote:
> > > On Fri, Feb 08, 2019 at 02:15:49PM +0200, Elena Reshetova wrote:
> > I can measure the impact with rdtsc(), I think it is *very* small.
> > Btw, what should be the good measurement test?
> > I am not that happy with just looping on fopen-fclose, too
> > much noise.
> IIRC amluto had a nice micro-bench for 'pure' syscall overhead
> somewhere.
> Something like getpid/gettid in a loop should work fairly well, that's a
> really light syscall to make.

Thanks! Let me try this for measurements next. I was surprise that
there nothing  ready-made in perf or rt-tools. You would think
this must be regularly in a need to measure. 

Best Regards,

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