linux-kernel - Re: [PATCH] perf probe: Add fastpath to do lookup by function name

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Date:	Thu, 24 Mar 2011 09:47:17 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf probe: Add fastpath to do lookup by function name


* Lin Ming <ming.m.lin@...el.com> wrote:

> ./perf stat -r 10 -- ./perf probe -k /home/mlin/vmlinux \
>         -s /home/mlin/linux-2.6 \
> 	--line csum_partial_copy_to_user > tmp.log
> 
> before patch applied
> =====================
>         364.535892 task-clock-msecs         #      0.997 CPUs  
>        865,862,109 cycles                   #   2375.245 M/sec 
>      1,255,259,630 instructions             #      1.450 IPC  

> after patch applied
> =====================
>          89.896405 task-clock-msecs         #      0.991 CPUs
>        214,553,875 cycles                   #   2386.679 M/sec
>        226,915,559 instructions             #      1.058 IPC

That's a very nice speedup :-)

Thanks,

	Ingo
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