linux-kernel - Re: lockmeter

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Message-ID: <20070128192634.GA25370@elte.hu>
Date:	Sun, 28 Jan 2007 20:26:34 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Bill Huey <billh@...ppy.monkey.org>
Cc:	"Martin J. Bligh" <mbligh@...igh.org>,
	Christoph Hellwig <hch@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	Dipankar Sarma <dipankar@...l9.org>
Subject: Re: lockmeter


* Bill Huey <billh@...ppy.monkey.org> wrote:

> > ISTR we still thought dcache scalability was a significant problem 
> > last time anyone looked at it seriously - just never got fixed. 
> > Dipankar?
> 
> My lock stat stuff shows dcache to a be a problem under -rt as well. 
> [...]

yeah, it shows up frequently, but it's hard to fix.

for a well-cached kernel rebuild on a system with lots of RAM and lots 
of CPUs, files_lock is the leading lock. (because the dcache is mostly 
populated already) files_lock is even more of a problem for workloads 
that do lots of open()/close() [Apache comes to mind].

	Ingo
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