Message-ID: <4B6745AA.1070703@bx.jp.nec.com>
Date: Mon, 01 Feb 2010 16:20:42 -0500
From: Keiichi KII <k-keiichi@bx.jp.nec.com>
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To: Tom Zanussi <tzanussi@gmail.com>
CC: linux-kernel@vger.kernel.org, lwoodman@redhat.com, linux-mm@kvack.org,
       mingo@elte.hu, riel@redhat.com, rostedt@goodmis.org,
       akpm@linux-foundation.org, fweisbec@gmail.com,
       Munehiro Ikeda <m-ikeda@ds.jp.nec.com>,
       Atsushi Tsuji <a-tsuji@bk.jp.nec.com>
Subject: Re: [RFC PATCH -tip 2/2 v2] add a scripts for pagecache usage per
 process
References: <4B5A3D00.8080901@bx.jp.nec.com>	 <4B5A3E19.6060502@bx.jp.nec.com> <1264234865.6595.75.camel@tropicana>	 <4B5E1855.4090809@bx.jp.nec.com> <1265012255.6526.18.camel@tropicana>
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Hello,

(02/01/10 03:17), Tom Zanussi wrote:
> Here's one way, using the tracepoint filters - it does make a big
> difference in this case.
> 
> Before (using the new -P option, which includes perf in the trace
> data):  
> 
> root@tropicana:~# perf record -c 1 -f -a -M -R -e filemap:add_to_page_cache -e filemap:find_get_page -e filemap:remove_from_page_cache -P sleep 5
> [ perf record: Woken up 0 times to write data ]
> [ perf record: Captured and wrote 71.201 MB perf.data (~3110815 samples) ]
> 
> After (filters out events generated by perf):
> 
> root@tropicana:~# perf record -c 1 -f -a -M -R -e filemap:add_to_page_cache -e filemap:find_get_page -e filemap:remove_from_page_cache sleep 5
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.309 MB perf.data (~13479 samples) ]

I tried your patch.
It works well for me. Thank you.

Keiichi
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