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Date: Wed, 15 Jun 2011 22:16:11 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Paul McKenney <paulmck@linux.vnet.ibm.com>,
        Tim Chen <tim.c.chen@linux.intel.com>, Hugh Dickins <hughd@google.com>,
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        Tony Luck <tony.luck@intel.com>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
        Mel Gorman <mel@csn.ul.ie>, Nick Piggin <npiggin@kernel.dk>,
        Namhyung Kim <namhyung@gmail.com>, ak@linux.intel.com,
        shaohua.li@intel.com, alex.shi@intel.com, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, "Rafael J. Wysocki" <rjw@sisk.pl>
Subject: Re: REGRESSION: Performance regressions from switching
 anon_vma->lock to mutex
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* Andrew Morton <akpm@linux-foundation.org> wrote:

> It could be that if more things move away from dedicated threads 
> and into worker threads, we'll need to build a separate accounting 
> system so we can see how much time worker threads are spending on a 
> per-handler basis.  Which means a new top-like tool, etc.

perf record -g will go a long way towards such a tool already - but i 
think it would be useful to create a more top-alike view as well. 

Thanks,

	Ingo
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