linux-kernel - Re: [PATCH] Apply memory policies to top two highest zones when highest zone is ZONE

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Message-Id: <20070806124408.16034ab8.akpm@linux-foundation.org>
Date:	Mon, 6 Aug 2007 12:44:08 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Mel Gorman <mel@...net.ie>, pj@....com, Lee.Schermerhorn@...com,
	kamezawa.hiroyu@...fujitsu.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [PATCH] Apply memory policies to top two highest zones when
 highest zone is ZONE_MOVABLE

On Thu, 2 Aug 2007 13:45:23 -0700 (PDT) Christoph Lameter <clameter@....com> wrote:

> On Thu, 2 Aug 2007, Mel Gorman wrote:
> 
> > +#ifdef CONFIG_NUMA
> > +/*
> > + * Only custom zonelists like MPOL_BIND need to be filtered as part of
> > + * policies. As described in the comment for struct zonelist_cache, these
> > + * zonelists will not have a zlcache so zlcache_ptr will not be set. Use
> > + * that to determine if the zonelists needs to be filtered or not.
> > + */
> > +static inline int alloc_should_filter_zonelist(struct zonelist *zonelist)
> > +{
> > +	return !zonelist->zlcache_ptr;
> > +}
> 
> I guess Paul needs to have a look at this one.

Which Paul?

> Otherwise
> 
> Acked-by: Christoph Lameter <clameter@....com>
> 
> > @@ -1166,6 +1167,18 @@ zonelist_scan:
> >  	z = zonelist->zones;
> >  
> >  	do {
> > +		/*
> > +		 * In NUMA, this could be a policy zonelist which contains
> > +		 * zones that may not be allowed by the current gfp_mask.
> > +		 * Check the zone is allowed by the current flags
> > +		 */
> > +		if (unlikely(alloc_should_filter_zonelist(zonelist))) {
> > +			if (highest_zoneidx == -1)
> > +				highest_zoneidx = gfp_zone(gfp_mask);
> > +			if (zone_idx(*z) > highest_zoneidx)
> > +				continue;
> > +		}
> > +
> >  		if (NUMA_BUILD && zlc_active &&
> 
> Hotpath. Sigh.
-
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