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

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Message-Id: <20101012100207.4efbdab6.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 12 Oct 2010 10:02:07 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
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 Mon, 11 Oct 2010 17:22:26 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> 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.
> 
ok, will do today.

-Kame

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