linux-kernel - Re: [PATCH 08/10] mm, compaction: pass gfp mask to compact

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Date:	Wed, 11 Jun 2014 17:24:58 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Vlastimil Babka <vbabka@...e.cz>
cc:	Minchan Kim <minchan@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Thelen <gthelen@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Christoph Lameter <cl@...ux.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 08/10] mm, compaction: pass gfp mask to compact_control

On Wed, 11 Jun 2014, Vlastimil Babka wrote:

> > > diff --git a/mm/compaction.c b/mm/compaction.c
> > > index c339ccd..d1e30ba 100644
> > > --- a/mm/compaction.c
> > > +++ b/mm/compaction.c
> > > @@ -965,8 +965,8 @@ static isolate_migrate_t isolate_migratepages(struct
> > > zone *zone,
> > >   	return ISOLATE_SUCCESS;
> > >   }
> > > 
> > > -static int compact_finished(struct zone *zone,
> > > -			    struct compact_control *cc)
> > > +static int compact_finished(struct zone *zone, struct compact_control
> > > *cc,
> > > +			    const int migratetype)
> > 
> > If we has gfp_mask, we could use gfpflags_to_migratetype from cc->gfp_mask.
> > What's is your intention?
> 
> Can't speak for David but I left it this way as it means
> gfpflags_to_migratetype is only called once per compact_zone. Now I realize my
> patch 10/10 repeats the call in isolate_migratepages_range so I'll probably
> update that as well.
> 

Yes, that was definitely the intention: call it once in compact_zone() and 
store it as const and then avoid calling it every time for 
compact_finished().
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