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Date:	Mon, 10 Nov 2014 11:23:15 +0800
From:	"Hillf Danton" <hillf.zj@...baba-inc.com>
To:	"'Vlastimil Babka'" <vbabka@...e.cz>,
	"'P. Christeas'" <xrg@...ux.gr>,
	"'linux-kernel'" <linux-kernel@...r.kernel.org>
Cc:	<linux-mm@...ck.org>
Subject: Re: Early test: hangs in mm/compact.c w. Linus's 12d7aacab56e9ef185c

> >
> > I guess this one would mitigate against Vlastmil's migration scanner issue,
> > wouldn't it?
> 
Nope, I wanted to see  if free pages are low enough.

> Please no, that's a wrong fix. The purpose of compaction is to make the
> high-order watermark meet, not give up.
> 
Yupe, have to spin.

--- a/mm/compaction.c	Sun Nov  9 12:02:59 2014
+++ b/mm/compaction.c	Mon Nov 10 11:12:07 2014
@@ -1074,6 +1074,8 @@ static int compact_finished(struct zone 
 	watermark = low_wmark_pages(zone);
 	watermark += (1 << cc->order);
 
+	if (!zone_watermark_ok(zone, 0, watermark, 0, 0))
+		return COMPACT_SKIPPED;
 	if (!zone_watermark_ok(zone, cc->order, watermark, 0, 0))
 		return COMPACT_CONTINUE;
 
--


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