Date: Fri, 4 Nov 2005 02:06:34 -0800
From: Paul Jackson <pj@sgi.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: akpm@osdl.org, pbadari@gmail.com, torvalds@osdl.org, jdike@addtoit.com,
       rob@landley.net, nickpiggin@yahoo.com.au, gh@us.ibm.com,
       kamezawa.hiroyu@jp.fujitsu.com, haveblue@us.ibm.com, mel@csn.ul.ie,
       mbligh@mbligh.org, kravetz@us.ibm.com, linux-mm@kvack.org,
       linux-kernel@vger.kernel.org, lhms-devel@lists.sourceforge.net
Subject: Re: [patch] swapin rlimit
Message-Id: <20051104020634.592dd38b.pj@sgi.com>
In-Reply-To: <20051104080731.GB21321@elte.hu>
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Ingo wrote:
> Seriously, while nr_swapped_in_pages ought to be OK, i think there is a 
> generic problem with /proc based stats.
> 
> System instrumentation people are already complaining about how costly 
> /proc parsing is. If you have to get some nontrivial stat from all 
> threads in the system, and if Linux doesnt offer that counter or summary 
> by default, it gets pretty expensive.

Agreed.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@sgi.com> 1.925.600.0401
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