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Date: Tue, 2 May 2006 18:07:53 +0200
From: Diego Calleja <diegocg@gmail.com>
To: Wu Fengguang <wfg@mail.ustc.edu.cn>
Cc: linux-kernel@vger.kernel.org, torvalds@osdl.org, akpm@osdl.org,
       axboe@suse.de, nickpiggin@yahoo.com.au, pbadari@us.ibm.com,
       arjan@infradead.org
Subject: Re: [RFC] kernel facilities for cache prefetching
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In-Reply-To: <346580906.19175@ustc.edu.cn>
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	<346580906.19175@ustc.edu.cn>
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El Tue, 2 May 2006 22:42:03 +0800,
Wu Fengguang <wfg@mail.ustc.edu.cn> escribi?:

> Nope. mincore() only provides info about files that are currently
> opened, by the process itself. The majority in the file cache are
> closed files.

Yes; what I meant was:
- start listening the process event connector as firsk task on startup
- get a list of what files are being used (every second or something)
  by looking at /proc/$PID/* stuff
- mincore() all those files at the end of the bootup

> Yes, it can still be useful after booting :) One can get the cache
> footprint of any task started at any time by taking snapshots of the
> cache before and after the task, and do a set-subtract on them.

Although this certainly looks simpler for userspace (and complete, if
you want to get absolutely all the info about files that get opened and
closed faster than the profile interval of a prefetcher) 

(another useful tool would be a dtrace-like thing)
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