From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f181.google.com (mail-pd0-f181.google.com [209.85.192.181]) by kanga.kvack.org (Postfix) with ESMTP id D6D0D6B0038 for ; Sat, 21 Mar 2015 07:58:11 -0400 (EDT) Received: by pdnc3 with SMTP id c3so134882746pdn.0 for ; Sat, 21 Mar 2015 04:58:11 -0700 (PDT) Received: from lgeamrelo02.lge.com (lgeamrelo02.lge.com. [156.147.1.126]) by mx.google.com with ESMTP id zb2si2230200pbb.57.2015.03.21.04.58.10 for ; Sat, 21 Mar 2015 04:58:11 -0700 (PDT) From: Gioh Kim Subject: [PATCH] mm/compaction: reset compaction scanner positions Date: Sat, 21 Mar 2015 20:58:26 +0900 Message-Id: <1426939106-30347-1-git-send-email-gioh.kim@lge.com> Sender: owner-linux-mm@kvack.org List-ID: To: akpm@linux-foundation.org, vbabka@suse.cz, rientjes@google.com, iamjoonsoo.kim@lge.com Cc: mgorman@suse.de, linux-mm@kvack.org, linux-kernel@vger.kernel.org, gunho.lee@lge.com, Gioh Kim Gioh Kim When the compaction is activated via /proc/sys/vm/compact_memory it would better scan the whole zone. And some platform, for instance ARM, has the start_pfn of a zone is zero. Therefore the first try to compaction via /proc doesn't work. It needs to force to reset compaction scanner position at first. Signed-off-by: Gioh Kim Acked-by: Vlastimil Babka --- mm/compaction.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/mm/compaction.c b/mm/compaction.c index 8c0d945..ccf48ce 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -1587,6 +1587,14 @@ static void __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc) INIT_LIST_HEAD(&cc->freepages); INIT_LIST_HEAD(&cc->migratepages); + /* + * When called via /proc/sys/vm/compact_memory + * this makes sure we compact the whole zone regardless of + * cached scanner positions. + */ + if (cc->order == -1) + __reset_isolation_suitable(zone); + if (cc->order == -1 || !compaction_deferred(zone, cc->order)) compact_zone(zone, cc); -- 1.7.9.5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org