82 lines
2.6 KiB
Diff
82 lines
2.6 KiB
Diff
From c01043c9aa51a63bd01c60e53494ca4a7e994542 Mon Sep 17 00:00:00 2001
|
|
From: Mel Gorman <mgorman@suse.de>
|
|
Date: Fri, 7 Oct 2011 16:17:23 +0100
|
|
Subject: [PATCH 2/2] mm: Abort reclaim/compaction if compaction can proceed
|
|
|
|
If compaction can proceed, shrink_zones() stops doing any work but
|
|
the callers still shrink_slab(), raises the priority and potentially
|
|
sleeps. This patch aborts direct reclaim/compaction entirely if
|
|
compaction can proceed.
|
|
|
|
Signed-off-by: Mel Gorman <mgorman@suse.de>
|
|
---
|
|
mm/vmscan.c | 20 ++++++++++++++++----
|
|
1 files changed, 16 insertions(+), 4 deletions(-)
|
|
|
|
diff --git a/mm/vmscan.c b/mm/vmscan.c
|
|
index 8c03534..b295a38 100644
|
|
--- a/mm/vmscan.c
|
|
+++ b/mm/vmscan.c
|
|
@@ -2000,14 +2000,19 @@ restart:
|
|
*
|
|
* If a zone is deemed to be full of pinned pages then just give it a light
|
|
* scan then give up on it.
|
|
+ *
|
|
+ * This function returns true if a zone is being reclaimed for a costly
|
|
+ * high-order allocation and compaction is either ready to begin or deferred.
|
|
+ * This indicates to the caller that it should retry the allocation or fail.
|
|
*/
|
|
-static void shrink_zones(int priority, struct zonelist *zonelist,
|
|
+static bool shrink_zones(int priority, struct zonelist *zonelist,
|
|
struct scan_control *sc)
|
|
{
|
|
struct zoneref *z;
|
|
struct zone *zone;
|
|
unsigned long nr_soft_reclaimed;
|
|
unsigned long nr_soft_scanned;
|
|
+ bool should_abort_reclaim = false;
|
|
|
|
for_each_zone_zonelist_nodemask(zone, z, zonelist,
|
|
gfp_zone(sc->gfp_mask), sc->nodemask) {
|
|
@@ -2025,12 +2030,15 @@ static void shrink_zones(int priority, struct zonelist *zonelist,
|
|
if (COMPACTION_BUILD) {
|
|
/*
|
|
* If we already have plenty of memory free
|
|
- * for compaction, don't free any more.
|
|
+ * for compaction in this zone , don't free any
|
|
+ * more.
|
|
*/
|
|
if (sc->order > PAGE_ALLOC_COSTLY_ORDER &&
|
|
(compaction_suitable(zone, sc->order) ||
|
|
- compaction_deferred(zone)))
|
|
+ compaction_deferred(zone))) {
|
|
+ should_abort_reclaim = true;
|
|
continue;
|
|
+ }
|
|
}
|
|
/*
|
|
* This steals pages from memory cgroups over softlimit
|
|
@@ -2049,6 +2057,8 @@ static void shrink_zones(int priority, struct zonelist *zonelist,
|
|
|
|
shrink_zone(priority, zone, sc);
|
|
}
|
|
+
|
|
+ return should_abort_reclaim;
|
|
}
|
|
|
|
static bool zone_reclaimable(struct zone *zone)
|
|
@@ -2113,7 +2123,9 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
|
|
sc->nr_scanned = 0;
|
|
if (!priority)
|
|
disable_swap_token(sc->mem_cgroup);
|
|
- shrink_zones(priority, zonelist, sc);
|
|
+ if (shrink_zones(priority, zonelist, sc))
|
|
+ break;
|
|
+
|
|
/*
|
|
* Don't shrink slabs when reclaiming memory from
|
|
* over limit cgroups
|
|
--
|
|
1.7.6.4
|
|
|