linux-kernel - Re: [PATCH 2/6] Use one zonelist that is filtered instead of multiple zonelists

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Message-ID: <20070821085147.GB29794@skynet.ie>
Date:	Tue, 21 Aug 2007 09:51:47 +0100
From:	mel@...net.ie (Mel Gorman)
To:	Christoph Lameter <clameter@....com>
Cc:	Lee.Schermerhorn@...com, ak@...e.de, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 2/6] Use one zonelist that is filtered instead of multiple zonelists

On (17/08/07 13:59), Christoph Lameter didst pronounce:
> On Fri, 17 Aug 2007, Mel Gorman wrote:
> 
> > +/* Returns the first zone at or below highest_zoneidx in a zonelist */
> > +static inline struct zone **first_zones_zonelist(struct zonelist *zonelist,
> > +					enum zone_type highest_zoneidx)
> > +{
> > +	struct zone **z;
> > +	for (z = zonelist->zones; zone_idx(*z) > highest_zoneidx; z++);
> > +	return z;
> > +}
> 
> The formatting above is a bit confusing. Add requires empty lines and put 
> the ; on a separate line.
> 
> 
> > +/* Returns the next zone at or below highest_zoneidx in a zonelist */
> > +static inline struct zone **next_zones_zonelist(struct zone **z,
> > +					enum zone_type highest_zoneidx)
> > +{
> > +	for (++z; zone_idx(*z) > highest_zoneidx; z++);
> 
> Looks weird too.
> 
> ++z on an earlier line and then
> 
> 	for ( ; zone_idx(*z) ...)
> 
> ?
> 

Ok, the relevant section now looks like

+/* Returns the first zone at or below highest_zoneidx in a zonelist */
+static inline struct zone **first_zones_zonelist(struct zonelist *zonelist,
+					enum zone_type highest_zoneidx)
+{
+	struct zone **z;
+
+	for (z = zonelist->zones;
+			zone_idx(*z) > highest_zoneidx;
+			z++)
+		;
+
+	return z;
+}
+
+/* Returns the next zone at or below highest_zoneidx in a zonelist */
+static inline struct zone **next_zones_zonelist(struct zone **z,
+					enum zone_type highest_zoneidx)
+{
+	/* Advance to the next zone in the zonelist */
+	z++;
+
+	/* Find the next suitable zone to use for the allocation */
+	for (; zone_idx(*z) > highest_zoneidx; z++)
+		;
+
+	return z;
+}

Is that better?

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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