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authorVlastimil Babka <vbabka@suse.cz>2014-01-21 15:51:07 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-21 16:19:48 -0800
commitde6c60a6c115acaa721cfd499e028a413d1fcbf3 (patch)
tree81277ea0bf611f37544dbb0a22e4eff3fc2a9aa8 /include
parent0eb927c0ab789d3d7d69f68acb850f69d4e7c36f (diff)
mm: compaction: encapsulate defer reset logic
Currently there are several functions to manipulate the deferred compaction state variables. The remaining case where the variables are touched directly is when a successful allocation occurs in direct compaction, or is expected to be successful in the future by kswapd. Here, the lowest order that is expected to fail is updated, and in the case of successful allocation, the deferred status and counter is reset completely. Create a new function compaction_defer_reset() to encapsulate this functionality and make it easier to understand the code. No functional change. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Mel Gorman <mgorman@suse.de> Reviewed-by: Rik van Riel <riel@redhat.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/compaction.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/compaction.h b/include/linux/compaction.h
index 091d72e70d8a..7e1c76e3cd68 100644
--- a/include/linux/compaction.h
+++ b/include/linux/compaction.h
@@ -62,6 +62,22 @@ static inline bool compaction_deferred(struct zone *zone, int order)
return zone->compact_considered < defer_limit;
}
+/*
+ * Update defer tracking counters after successful compaction of given order,
+ * which means an allocation either succeeded (alloc_success == true) or is
+ * expected to succeed.
+ */
+static inline void compaction_defer_reset(struct zone *zone, int order,
+ bool alloc_success)
+{
+ if (alloc_success) {
+ zone->compact_considered = 0;
+ zone->compact_defer_shift = 0;
+ }
+ if (order >= zone->compact_order_failed)
+ zone->compact_order_failed = order + 1;
+}
+
/* Returns true if restarting compaction after many failures */
static inline bool compaction_restarting(struct zone *zone, int order)
{