linux-kernel - [PATCH 2/5] mm, vmscan: avoid passing in classzone_idx unnecessarily to compaction

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Message-Id: <1468588165-12461-3-git-send-email-mgorman@techsingularity.net>
Date:	Fri, 15 Jul 2016 14:09:22 +0100
From:	Mel Gorman <mgorman@...hsingularity.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Minchan Kim <minchan@...nel.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mel Gorman <mgorman@...hsingularity.net>
Subject: [PATCH 2/5] mm, vmscan: avoid passing in classzone_idx unnecessarily to compaction_ready -fix

As pointed out by Vlastimil, there is a redundant check in shrink_zones
since commit "mm, vmscan: avoid passing in classzone_idx unnecessarily to
compaction_ready".  The zonelist iterator only returns zones that already
meet the requirements of the allocation request.

This is a fix to the mmotm patch
mm-vmscan-avoid-passing-in-classzone_idx-unnecessarily-to-compaction_ready.patch

Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
---
 mm/vmscan.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 4fdb9e419588..c2ad4263f965 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2606,7 +2606,6 @@ static void shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
 			 */
 			if (IS_ENABLED(CONFIG_COMPACTION) &&
 			    sc->order > PAGE_ALLOC_COSTLY_ORDER &&
-			    zonelist_zone_idx(z) <= sc->reclaim_idx &&
 			    compaction_ready(zone, sc)) {
 				sc->compaction_ready = true;
 				continue;
-- 
2.6.4