From: Mel Gorman <mgorman@techsingularity.net> To: Andrew Morton <akpm@linux-foundation.org>, Linux-MM <linux-mm@kvack.org> Cc: Rik van Riel <riel@surriel.com>, Vlastimil Babka <vbabka@suse.cz>, Johannes Weiner <hannes@cmpxchg.org>, LKML <linux-kernel@vger.kernel.org>, Mel Gorman <mgorman@techsingularity.net> Subject: [PATCH 11/27] mm: vmscan: Do not reclaim from kswapd if there is any eligible zone Date: Tue, 21 Jun 2016 15:15:50 +0100 [thread overview] Message-ID: <1466518566-30034-12-git-send-email-mgorman@techsingularity.net> (raw) In-Reply-To: <1466518566-30034-1-git-send-email-mgorman@techsingularity.net> kswapd scans from highest to lowest for a zone that requires balancing. This was necessary when reclaim was per-zone to fairly age pages on lower zones. Now that we are reclaiming on a per-node basis, any eligible zone can be used and pages will still be aged fairly. This patch avoids reclaiming excessively unless buffer_heads are over the limit and it's necessary to reclaim from a higher zone than requested by the waker of kswapd to relieve low memory pressure. Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Acked-by: Vlastimil Babka <vbabka@suse.cz> --- mm/vmscan.c | 32 +++++++++++++++++++------------- 1 file changed, 19 insertions(+), 13 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 8347406c75fa..d42a86e603e8 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -3132,24 +3132,30 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) sc.nr_reclaimed = 0; - /* Scan from the highest requested zone to dma */ + /* + * If the number of buffer_heads in the machine exceeds the + * maximum allowed level and this node has a highmem zone, + * force kswapd to reclaim from it to relieve lowmem pressure. + */ + if (buffer_heads_over_limit) { + for (i = MAX_NR_ZONES - 1; i >= 0; i--) { + zone = pgdat->node_zones + i; + if (!populated_zone(zone)) + continue; + + if (is_highmem_idx(i)) + classzone_idx = i; + break; + } + } + + /* Only reclaim if there are no eligible zones */ for (i = classzone_idx; i >= 0; i--) { zone = pgdat->node_zones + i; if (!populated_zone(zone)) continue; - /* - * If the number of buffer_heads in the machine - * exceeds the maximum allowed level and this node - * has a highmem zone, force kswapd to reclaim from - * it to relieve lowmem pressure. - */ - if (buffer_heads_over_limit && is_highmem_idx(i)) { - classzone_idx = i; - break; - } - - if (!zone_balanced(zone, order, 0)) { + if (!zone_balanced(zone, sc.order, classzone_idx)) { classzone_idx = i; break; } -- 2.6.4
WARNING: multiple messages have this Message-ID (diff)
From: Mel Gorman <mgorman@techsingularity.net> To: Andrew Morton <akpm@linux-foundation.org>, Linux-MM <linux-mm@kvack.org> Cc: Rik van Riel <riel@surriel.com>, Vlastimil Babka <vbabka@suse.cz>, Johannes Weiner <hannes@cmpxchg.org>, LKML <linux-kernel@vger.kernel.org>, Mel Gorman <mgorman@techsingularity.net> Subject: [PATCH 11/27] mm: vmscan: Do not reclaim from kswapd if there is any eligible zone Date: Tue, 21 Jun 2016 15:15:50 +0100 [thread overview] Message-ID: <1466518566-30034-12-git-send-email-mgorman@techsingularity.net> (raw) In-Reply-To: <1466518566-30034-1-git-send-email-mgorman@techsingularity.net> kswapd scans from highest to lowest for a zone that requires balancing. This was necessary when reclaim was per-zone to fairly age pages on lower zones. Now that we are reclaiming on a per-node basis, any eligible zone can be used and pages will still be aged fairly. This patch avoids reclaiming excessively unless buffer_heads are over the limit and it's necessary to reclaim from a higher zone than requested by the waker of kswapd to relieve low memory pressure. Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Acked-by: Vlastimil Babka <vbabka@suse.cz> --- mm/vmscan.c | 32 +++++++++++++++++++------------- 1 file changed, 19 insertions(+), 13 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 8347406c75fa..d42a86e603e8 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -3132,24 +3132,30 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) sc.nr_reclaimed = 0; - /* Scan from the highest requested zone to dma */ + /* + * If the number of buffer_heads in the machine exceeds the + * maximum allowed level and this node has a highmem zone, + * force kswapd to reclaim from it to relieve lowmem pressure. + */ + if (buffer_heads_over_limit) { + for (i = MAX_NR_ZONES - 1; i >= 0; i--) { + zone = pgdat->node_zones + i; + if (!populated_zone(zone)) + continue; + + if (is_highmem_idx(i)) + classzone_idx = i; + break; + } + } + + /* Only reclaim if there are no eligible zones */ for (i = classzone_idx; i >= 0; i--) { zone = pgdat->node_zones + i; if (!populated_zone(zone)) continue; - /* - * If the number of buffer_heads in the machine - * exceeds the maximum allowed level and this node - * has a highmem zone, force kswapd to reclaim from - * it to relieve lowmem pressure. - */ - if (buffer_heads_over_limit && is_highmem_idx(i)) { - classzone_idx = i; - break; - } - - if (!zone_balanced(zone, order, 0)) { + if (!zone_balanced(zone, sc.order, classzone_idx)) { classzone_idx = i; break; } -- 2.6.4 -- 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: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2016-06-21 14:18 UTC|newest] Thread overview: 130+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-06-21 14:15 [PATCH 00/27] Move LRU page reclaim from zones to nodes v7 Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-21 14:15 ` [PATCH 01/27] mm, vmstat: Add infrastructure for per-node vmstats Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-21 14:15 ` [PATCH 02/27] mm, vmscan: Move lru_lock to the node Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-21 14:15 ` [PATCH 03/27] mm, vmscan: Move LRU lists to node Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-22 12:50 ` Vlastimil Babka 2016-06-22 12:50 ` Vlastimil Babka 2016-06-21 14:15 ` [PATCH 04/27] mm, vmscan: Begin reclaiming pages on a per-node basis Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-22 14:04 ` Vlastimil Babka 2016-06-22 14:04 ` Vlastimil Babka 2016-06-22 16:00 ` Vlastimil Babka 2016-06-22 16:00 ` Vlastimil Babka 2016-06-23 11:07 ` Mel Gorman 2016-06-23 11:07 ` Mel Gorman 2016-06-23 11:13 ` Michal Hocko 2016-06-23 11:13 ` Michal Hocko 2016-06-23 10:58 ` Mel Gorman 2016-06-23 10:58 ` Mel Gorman 2016-06-21 14:15 ` [PATCH 05/27] mm, vmscan: Have kswapd only scan based on the highest requested zone Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-21 14:15 ` [PATCH 06/27] mm, vmscan: Make kswapd reclaim in terms of nodes Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-21 14:15 ` [PATCH 07/27] mm, vmscan: Remove balance gap Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-21 14:15 ` [PATCH 08/27] mm, vmscan: Simplify the logic deciding whether kswapd sleeps Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-22 15:30 ` Vlastimil Babka 2016-06-22 15:30 ` Vlastimil Babka 2016-06-21 14:15 ` [PATCH 09/27] mm, vmscan: By default have direct reclaim only shrink once per node Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-21 14:15 ` [PATCH 10/27] mm, vmscan: Remove duplicate logic clearing node congestion and dirty state Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-21 14:15 ` Mel Gorman [this message] 2016-06-21 14:15 ` [PATCH 11/27] mm: vmscan: Do not reclaim from kswapd if there is any eligible zone Mel Gorman 2016-06-21 14:15 ` [PATCH 12/27] mm, vmscan: Make shrink_node decisions more node-centric Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-22 13:20 ` Michal Hocko 2016-06-22 13:20 ` Michal Hocko 2016-06-22 15:42 ` Vlastimil Babka 2016-06-22 15:42 ` Vlastimil Babka 2016-06-21 14:15 ` [PATCH 13/27] mm, memcg: Move memcg limit enforcement from zones to nodes Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-22 13:15 ` Michal Hocko 2016-06-22 13:15 ` Michal Hocko 2016-06-21 14:15 ` [PATCH 14/27] mm, workingset: Make working set detection node-aware Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-21 14:15 ` [PATCH 15/27] mm, page_alloc: Consider dirtyable memory in terms of nodes Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-22 14:15 ` Michal Hocko 2016-06-22 14:15 ` Michal Hocko 2016-06-22 14:27 ` Michal Hocko 2016-06-22 14:27 ` Michal Hocko 2016-06-23 12:53 ` Mel Gorman 2016-06-23 12:53 ` Mel Gorman 2016-06-23 13:13 ` Michal Hocko 2016-06-23 13:13 ` Michal Hocko 2016-06-21 14:15 ` [PATCH 16/27] mm: Move page mapped accounting to the node Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-21 22:32 ` Andrew Morton 2016-06-21 22:32 ` Andrew Morton 2016-06-23 8:35 ` Mel Gorman 2016-06-23 8:35 ` Mel Gorman 2016-06-22 14:35 ` Michal Hocko 2016-06-22 14:35 ` Michal Hocko 2016-06-21 14:15 ` [PATCH 17/27] mm: Rename NR_ANON_PAGES to NR_ANON_MAPPED Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-22 14:28 ` Michal Hocko 2016-06-22 14:28 ` Michal Hocko 2016-06-21 14:15 ` [PATCH 18/27] mm: Move most file-based accounting to the node Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-22 14:38 ` Michal Hocko 2016-06-22 14:38 ` Michal Hocko 2016-06-21 14:15 ` [PATCH 19/27] mm: Move vmscan writes and file write " Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-22 14:40 ` Michal Hocko 2016-06-22 14:40 ` Michal Hocko 2016-06-23 13:57 ` Mel Gorman 2016-06-23 13:57 ` Mel Gorman 2016-06-23 14:06 ` Vlastimil Babka 2016-06-23 14:06 ` Vlastimil Babka 2016-06-23 16:03 ` Mel Gorman 2016-06-23 16:03 ` Mel Gorman 2016-06-21 14:15 ` [PATCH 20/27] mm, vmscan: Update classzone_idx if buffer_heads_over_limit Mel Gorman 2016-06-21 14:15 ` Mel Gorman 2016-06-22 14:49 ` Michal Hocko 2016-06-22 14:49 ` Michal Hocko 2016-06-21 14:16 ` [PATCH 21/27] mm, vmscan: Only wakeup kswapd once per node for the requested classzone Mel Gorman 2016-06-21 14:16 ` Mel Gorman 2016-06-22 16:08 ` Vlastimil Babka 2016-06-22 16:08 ` Vlastimil Babka 2016-06-21 14:16 ` [PATCH 22/27] mm: Convert zone_reclaim to node_reclaim Mel Gorman 2016-06-21 14:16 ` Mel Gorman 2016-06-21 14:16 ` [PATCH 23/27] mm, vmscan: Add classzone information to tracepoints Mel Gorman 2016-06-21 14:16 ` Mel Gorman 2016-06-21 14:16 ` [PATCH 24/27] mm, page_alloc: Remove fair zone allocation policy Mel Gorman 2016-06-21 14:16 ` Mel Gorman 2016-06-21 14:16 ` [PATCH 25/27] mm: page_alloc: Cache the last node whose dirty limit is reached Mel Gorman 2016-06-21 14:16 ` Mel Gorman 2016-06-21 14:16 ` [PATCH 26/27] mm: vmstat: Replace __count_zone_vm_events with a zone id equivalent Mel Gorman 2016-06-21 14:16 ` Mel Gorman 2016-06-21 14:16 ` [PATCH 27/27] mm: vmstat: Account per-zone stalls and pages skipped during reclaim Mel Gorman 2016-06-21 14:16 ` Mel Gorman 2016-06-23 10:26 ` [PATCH 00/27] Move LRU page reclaim from zones to nodes v7 Mel Gorman 2016-06-23 10:26 ` Mel Gorman 2016-06-23 11:27 ` Michal Hocko 2016-06-23 11:27 ` Michal Hocko 2016-06-23 12:33 ` Mel Gorman 2016-06-23 12:33 ` Mel Gorman 2016-06-23 12:44 ` Michal Hocko 2016-06-23 12:44 ` Michal Hocko 2016-06-23 21:45 ` Andrew Morton 2016-06-23 21:45 ` Andrew Morton 2016-06-24 6:35 ` Balbir Singh 2016-06-24 6:35 ` Balbir Singh 2016-06-24 7:50 ` Mel Gorman 2016-06-24 7:50 ` Mel Gorman 2016-06-27 12:48 ` Balbir Singh 2016-06-27 12:48 ` Balbir Singh -- strict thread matches above, loose matches on Subject: below -- 2016-06-09 18:04 [PATCH 00/27] Move LRU page reclaim from zones to nodes v6 Mel Gorman 2016-06-09 18:04 ` [PATCH 11/27] mm: vmscan: Do not reclaim from kswapd if there is any eligible zone Mel Gorman 2016-06-09 18:04 ` Mel Gorman 2016-06-16 10:08 ` Vlastimil Babka 2016-06-16 10:08 ` Vlastimil Babka 2016-04-15 9:13 [PATCH 00/27] Move LRU page reclaim from zones to nodes v5 Mel Gorman 2016-04-15 9:13 ` [PATCH 11/27] mm: vmscan: Do not reclaim from kswapd if there is any eligible zone Mel Gorman 2016-04-15 9:13 ` Mel Gorman 2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman 2016-04-06 11:20 ` [PATCH 11/27] mm: vmscan: Do not reclaim from kswapd if there is any eligible zone Mel Gorman 2016-04-06 11:20 ` Mel Gorman
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