linux-kernel - [PATCH RFC 3/3] mm, vmscan: correct prepare_kswapd

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Date:   Tue, 24 Jan 2017 15:49:04 +0800
From:   Jia He <hejianet@...il.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Michal Hocko <mhocko@...e.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        zhong jiang <zhongjiang@...wei.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Vaishali Thakkar <vaishali.thakkar@...cle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Vlastimil Babka <vbabka@...e.cz>,
        Minchan Kim <minchan@...nel.org>,
        Rik van Riel <riel@...hat.com>, Jia He <hejianet@...il.com>
Subject: [PATCH RFC 3/3] mm, vmscan: correct prepare_kswapd_sleep return value

When there is no reclaimable pages in the zone, even the zone is
not balanced, we let kswapd go sleeping. That is prepare_kswapd_sleep
will return true in this case.

Signed-off-by: Jia He <hejianet@...il.com>
---
 mm/vmscan.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 7396a0a..54445e2 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3140,7 +3140,8 @@ static bool prepare_kswapd_sleep(pg_data_t *pgdat, int order, int classzone_idx)
 		if (!managed_zone(zone))
 			continue;
 
-		if (!zone_balanced(zone, order, classzone_idx))
+		if (!zone_balanced(zone, order, classzone_idx)
+			&& !zone_reclaimable_pages(zone))
 			return false;
 	}
 
-- 
2.5.5