linux-kernel - Re: [PATCH tip 0/5] perf: make top share sym routines with report

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Message-ID: <20090528220043.GA20964@elte.hu>
Date:	Fri, 29 May 2009 00:00:43 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Mike Galbraith <efault@....de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH tip 0/5] perf: make top share sym routines with report


* Arnaldo Carvalho de Melo <acme@...hat.com> wrote:

> Haven't done and perf stat runs tho. Perhaps ask for running it 
> for 5 refreshes and then exit.

I've benchmarked it. With about half a million sample IRQs per 
second on a 16way x86 box the overhead went from 22.3%:

   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME   COMMAND          
  4701 mingo     20   0  423m  61m 1796 R 22.3  0.5   0:08.11 perf             

down to:
         
   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME   COMMAND          
  3386 mingo     20   0 88068  61m 1756 R 18.2  0.5   0:03.06 perf      

So it's a ~22% speedup.

Also, there's much less virtual memory used as well - a factor of 5 
reduction (!).

Applied and pushed out - thanks Arnaldo!

	Ingo
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