linux-kernel - Re: Avoid allocating during interleave from almost full nodes

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Message-Id: <1162999085.14238.17.camel@twins>
Date:	Wed, 08 Nov 2006 16:18:05 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Paul Jackson <pj@....com>
Cc:	Christoph Lameter <clameter@....com>, akpm@...l.org,
	linux-kernel@...r.kernel.org
Subject: Re: Avoid allocating during interleave from almost full nodes

On Wed, 2006-11-08 at 02:21 -0800, Paul Jackson wrote:
> Christoph wrote:
> > On Sat, 4 Nov 2006, Paul Jackson wrote:
> > 
> > >   Do you know of any existing counters that we could use like this?
> > > 
> > > Adding a system wide count of pages allocated or scanned, just for
> > > these fullnode hint caches, bothers me.
> > 
> > There are already such counters. PGALLOC_* and PGSCAN_*. See 
> > include/linux/vmstat.h
> 
> 
>   Andrew,
> 
>     I'm willing to take a shot at replacing the wall clock time
>     base with one of these vm counters, in my patch in *-mm:
> 
> 	memory-page_alloc-zonelist-caching-speedup.patch
> 
>     But it will be a few weeks before I can get to it.
> 
>     I really need to do some other stuff first.

The swap token code in -mm (which I still have to review) has a global
fault counter to measure 'time'. Perhaps we can generalise that.


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