linux-kernel - Re: [PATCH 03/10] mm, page_alloc: Remove unnecessary recalculations for dirty zone balancing

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Date:	Thu, 23 Jul 2015 13:28:28 +0100
From:	Mel Gorman <mgorman@...hsingularity.net>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Linux-MM <linux-mm@...ck.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Rik van Riel <riel@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Pintu Kumar <pintu.k@...sung.com>,
	Xishi Qiu <qiuxishi@...wei.com>, Gioh Kim <gioh.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/10] mm, page_alloc: Remove unnecessary recalculations
 for dirty zone balancing

On Tue, Jul 21, 2015 at 05:08:42PM -0700, David Rientjes wrote:
> On Mon, 20 Jul 2015, Mel Gorman wrote:
> 
> > From: Mel Gorman <mgorman@...e.de>
> > 
> > File-backed pages that will be immediately dirtied are balanced between
> > zones but it's unnecessarily expensive. Move consider_zone_balanced into
> > the alloc_context instead of checking bitmaps multiple times.
> > 
> > Signed-off-by: Mel Gorman <mgorman@...e.de>
> 
> Acked-by: David Rientjes <rientjes@...gle.com>
> 

Thanks.

> consider_zone_dirty eliminates zones over their dirty limits and 
> zone_dirty_ok() returns true if zones are under their dirty limits, so the 
> naming of both are a little strange.  You might consider changing them 
> while you're here.

Yeah, that seems sensible. I named the struct field spread_dirty_page so
the relevant check now looks like

	if (ac->spread_dirty_page && !zone_dirty_ok(zone))

Alternative suggestions welcome but I think this is more meaningful than
consider_zone_dirty was.

-- 
Mel Gorman
SUSE Labs
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