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Date: Fri, 8 Feb 2019 16:15:02 +0100
From: Peter Zijlstra <>
To: "Reshetova, Elena" <>
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

Something like getpid/gettid in a loop should work fairly well, that's a
really light syscall to make.

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