linux-kernel - [PATCH 2/3] mm, compaction: skip over holes in __reset_isolation

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Date:   Sat, 15 Apr 2017 14:17:33 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     linux-mm@...ck.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Reza Arbab <arbab@...ux.vnet.ibm.com>,
        Yasuaki Ishimatsu <yasu.isimatu@...il.com>,
        qiuxishi@...wei.com, Kani Toshimitsu <toshi.kani@....com>,
        slaoub@...il.com, Joonsoo Kim <js1304@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Daniel Kiper <daniel.kiper@...cle.com>,
        Igor Mammedov <imammedo@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>
Subject: [PATCH 2/3] mm, compaction: skip over holes in __reset_isolation_suitable

From: Michal Hocko <mhocko@...e.com>

__reset_isolation_suitable walks the whole zone pfn range and it tries
to jump over holes by checking the zone for each page. It might still
stumble over offline pages, though. Skip those by checking PageReserved.

Signed-off-by: Michal Hocko <mhocko@...e.com>
---
 mm/compaction.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/compaction.c b/mm/compaction.c
index de64dedefe0e..df4156d8b037 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -239,6 +239,8 @@ static void __reset_isolation_suitable(struct zone *zone)
 			continue;
 
 		page = pfn_to_page(pfn);
+		if (PageReserved(page))
+			continue;
 		if (zone != page_zone(page))
 			continue;
 
-- 
2.11.0