linux-kernel - Re: Problem: scaling of /proc/stat on large systems

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Message-Id: <20101011172226.6162476c.akpm@linux-foundation.org>
Date:	Mon, 11 Oct 2010 17:22:26 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Jack Steiner <steiner@....com>, yinghai@...nel.org, mingo@...e.hu,
	linux-kernel@...r.kernel.org
Subject: Re: Problem: scaling of /proc/stat on large systems

On Tue, 12 Oct 2010 09:09:07 +0900 KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> > > 
> > > How about this ? This is an add-on patch.
> > 
> > Nice!!
> > 
> > The combination of the 2 patches solves the problem.
> > The timings are (4096p, 256 nodes, 4592 irqs):
> > 
> > 	# time cat /proc/stat > /dev/null
> > 
> > 	Baseline:		12.627 sec
> > 	Patch1  :		 2.459 sec
> > 	Patch 1 + Patch 2:	  .561 sec
> > 
> > 
> > Acked-by: Jack Steiner <steiner@....com>
> > 
> 
> Thank you for testing. I'll post again if necessary.

Yes please.  This has been going on for two weeks so memories need
refreshing.  Also we have no patch title and no changelog which
includes the testing results.

I could stitch all that together of course, but it's best that it all
be done afresh, I think.

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