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 26/28] mm: page_alloc: Cache the last node whose dirty limit is reached
Date: Tue, 12 Apr 2016 11:45:02 +0100 [thread overview]
Message-ID: <1460457904-754-13-git-send-email-mgorman@techsingularity.net> (raw)
In-Reply-To: <1460457904-754-1-git-send-email-mgorman@techsingularity.net>
If a page is about to be dirtied then the page allocator attempts to limit
the total number of dirty pages that exists in any given zone. The call
to node_dirty_ok is expensive so this patch records if the last pgdat
examined hit the dirty limits. In some cases, this reduces the number
of calls to node_dirty_ok().
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
mm/page_alloc.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b54f45876130..490a3cd34b7d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2699,6 +2699,8 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags,
{
struct zoneref *z = ac->preferred_zoneref;
struct zone *zone;
+ struct pglist_data *last_pgdat_dirty_limit = NULL;
+
/*
* Scan zonelist, looking for a zone with enough free.
* See also __cpuset_node_allowed() comment in kernel/cpuset.c.
@@ -2731,8 +2733,15 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags,
* will require awareness of nodes in the
* dirty-throttling and the flusher threads.
*/
- if (ac->spread_dirty_pages && !node_dirty_ok(zone->zone_pgdat))
- continue;
+ if (ac->spread_dirty_pages) {
+ if (last_pgdat_dirty_limit == zone->zone_pgdat)
+ continue;
+
+ if (!node_dirty_ok(zone->zone_pgdat)) {
+ last_pgdat_dirty_limit = zone->zone_pgdat;
+ continue;
+ }
+ }
mark = zone->watermark[alloc_flags & ALLOC_WMARK_MASK];
if (!zone_watermark_fast(zone, order, mark,
--
2.6.4
--
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next prev parent reply other threads:[~2016-04-12 10:45 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-12 10:25 [PATCH 00/28] Move LRU page reclaim from zones to nodes v4 Mel Gorman
2016-04-12 10:25 ` [PATCH 01/28] mm, page_alloc: Use ac->classzone_idx instead of zone_idx(preferred_zone) Mel Gorman
2016-04-12 10:25 ` [PATCH 02/28] mm, vmstat: Add infrastructure for per-node vmstats Mel Gorman
2016-04-12 10:25 ` [PATCH 03/28] mm, vmscan: Move lru_lock to the node Mel Gorman
2016-04-12 10:25 ` [PATCH 04/28] mm, vmscan: Move LRU lists to node Mel Gorman
2016-04-12 10:26 ` [PATCH 05/28] mm, vmscan: Begin reclaiming pages on a per-node basis Mel Gorman
2016-04-12 10:26 ` [PATCH 06/28] mm, vmscan: Have kswapd only scan based on the highest requested zone Mel Gorman
2016-04-12 10:26 ` [PATCH 07/28] mm, vmscan: Make kswapd reclaim in terms of nodes Mel Gorman
2016-04-12 10:26 ` [PATCH 08/28] mm, vmscan: Remove balance gap Mel Gorman
2016-04-12 10:26 ` [PATCH 09/28] mm, vmscan: Simplify the logic deciding whether kswapd sleeps Mel Gorman
2016-04-12 10:26 ` [PATCH 10/28] mm, vmscan: By default have direct reclaim only shrink once per node Mel Gorman
2016-04-12 10:26 ` [PATCH 11/28] mm, vmscan: Clear congestion, dirty and need for compaction on a per-node basis Mel Gorman
2016-04-12 10:26 ` [PATCH 12/28] mm: vmscan: Do not reclaim from kswapd if there is any eligible zone Mel Gorman
2016-04-12 10:26 ` [PATCH 13/28] mm, vmscan: Make shrink_node decisions more node-centric Mel Gorman
2016-04-12 10:44 ` [PATCH 14/28] mm, memcg: Move memcg limit enforcement from zones to nodes Mel Gorman
2016-04-12 10:44 ` [PATCH 15/28] mm, workingset: Make working set detection node-aware Mel Gorman
2016-04-12 10:44 ` [PATCH 16/28] mm, page_alloc: Consider dirtyable memory in terms of nodes Mel Gorman
2016-04-12 10:44 ` [PATCH 17/28] mm: Move page mapped accounting to the node Mel Gorman
2016-04-12 10:44 ` [PATCH 18/28] mm: Rename NR_ANON_PAGES to NR_ANON_MAPPED Mel Gorman
2016-04-12 10:44 ` [PATCH 19/28] mm: Move most file-based accounting to the node Mel Gorman
2016-04-12 10:44 ` [PATCH 20/28] mm: Move vmscan writes and file write " Mel Gorman
2016-04-12 10:44 ` [PATCH 21/28] mm, vmscan: Update classzone_idx if buffer_heads_over_limit Mel Gorman
2016-04-12 10:44 ` [PATCH 22/28] mm, vmscan: Only wakeup kswapd once per node for the requested classzone Mel Gorman
2016-04-12 10:44 ` [PATCH 23/28] mm: Convert zone_reclaim to node_reclaim Mel Gorman
2016-04-12 10:45 ` [PATCH 24/28] mm, vmscan: Add classzone information to tracepoints Mel Gorman
2016-04-12 10:45 ` [PATCH 25/28] mm, page_alloc: Remove fair zone allocation policy Mel Gorman
2016-04-12 10:45 ` Mel Gorman [this message]
2016-04-12 10:45 ` [PATCH 27/28] mm: vmstat: Replace __count_zone_vm_events with a zone id equivalent Mel Gorman
2016-04-12 10:46 ` [PATCH 28/28] mm: vmstat: Account per-zone stalls and pages skipped during reclaim Mel Gorman
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