linux-kernel - Re: meminfo Committed

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Date:	Mon, 27 Apr 2009 13:27:22 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	balbir@...ux.vnet.ibm.com
Cc:	kosaki.motohiro@...fujitsu.com, dave@...ux.vnet.ibm.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	ebmunson@...ibm.com, mel@...ux.vnet.ibm.com,
	cl@...ux-foundation.org
Subject: Re: meminfo Committed_AS underflows

On Wed, 15 Apr 2009 14:17:13 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> * KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> [2009-04-15 13:10:06]:
> 
> > > * KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> [2009-04-15 11:04:59]:
> > > 
> > > >  	committed = atomic_long_read(&vm_committed_space);
> > > > +	if (committed < 0)
> > > > +		committed = 0;
> > > 

Is there a reason why we can't use a boring old percpu_counter for
vm_committed_space?  That way the meminfo code can just use
percpu_counter_read_positive().

Or perhaps just percpu_counter_read().  The percpu_counter code does a
better job of handling large cpu counts than the
mysteriously-duplicative open-coded stuff we have there.


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