Re: [PATCH 06/16] mm: page_alloc: Calculate classzone_idx once from the zonelist ref

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On Fri, Apr 18, 2014 at 02:03:09PM -0400, Johannes Weiner wrote:
> On Fri, Apr 18, 2014 at 03:50:33PM +0100, Mel Gorman wrote:
> > @@ -2463,7 +2462,7 @@ static inline struct page *
> >  __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
> >  	struct zonelist *zonelist, enum zone_type high_zoneidx,
> >  	nodemask_t *nodemask, struct zone *preferred_zone,
> > -	int migratetype)
> > +	int classzone_idx, int migratetype)
> >  {
> >  	const gfp_t wait = gfp_mask & __GFP_WAIT;
> >  	struct page *page = NULL;
> 
> There is another potential update of preferred_zone in this function
> after which the classzone_idx should probably be refreshed:
> 
> 	/*
> 	 * Find the true preferred zone if the allocation is unconstrained by
> 	 * cpusets.
> 	 */
> 	if (!(alloc_flags & ALLOC_CPUSET) && !nodemask)
> 		first_zones_zonelist(zonelist, high_zoneidx, NULL,
> 					&preferred_zone);

Thanks, I'll fix it up for v2.

-- 
Mel Gorman
SUSE Labs
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