The patch titled
Subject: mm, compaction: more reliably increase direct compaction priority-fix
has been added to the -mm tree. Its filename is
mm-compaction-more-reliably-increase-direct-compaction-priority-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-compaction-more-reliably-increase-direct-compaction-priority-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-compaction-more-reliably-increase-direct-compaction-priority-fix.patch
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------------------------------------------------------
From: Vlastimil Babka <vbabka@xxxxxxx>
Subject: mm, compaction: more reliably increase direct compaction priority-fix
When increasing the compaction priority, also reset retries. Otherwise we
can consume all retries on the lower priorities. Also pull the retries
increment into should_compact_retry() so it counts only the rounds where
we actually rely on it.
Suggested-by: Michal Hocko <mhocko@xxxxxxxx>
Link: http://lkml.kernel.org/r/20160926162025.21555-2-vbabka@xxxxxxx
Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 19 ++++++++++---------
1 file changed, 10 insertions(+), 9 deletions(-)
diff -puN mm/page_alloc.c~mm-compaction-more-reliably-increase-direct-compaction-priority-fix mm/page_alloc.c
--- a/mm/page_alloc.c~mm-compaction-more-reliably-increase-direct-compaction-priority-fix
+++ a/mm/page_alloc.c
@@ -3160,13 +3160,16 @@ static inline bool
should_compact_retry(struct alloc_context *ac, int order, int alloc_flags,
enum compact_result compact_result,
enum compact_priority *compact_priority,
- int compaction_retries)
+ int *compaction_retries)
{
int max_retries = MAX_COMPACT_RETRIES;
if (!order)
return false;
+ if (compaction_made_progress(compact_result))
+ (*compaction_retries)++;
+
/*
* compaction considers all the zone as desperately out of memory
* so it doesn't really make much sense to retry except when the
@@ -3194,16 +3197,17 @@ should_compact_retry(struct alloc_contex
*/
if (order > PAGE_ALLOC_COSTLY_ORDER)
max_retries /= 4;
- if (compaction_retries <= max_retries)
+ if (*compaction_retries <= max_retries)
return true;
/*
- * Make sure there is at least one attempt at the highest priority
- * if we exhausted all retries at the lower priorities
+ * Make sure there are attempts at the highest priority if we exhausted
+ * all retries or failed at the lower priorities.
*/
check_priority:
if (*compact_priority > MIN_COMPACT_PRIORITY) {
(*compact_priority)--;
+ *compaction_retries = 0;
return true;
}
return false;
@@ -3222,7 +3226,7 @@ static inline bool
should_compact_retry(struct alloc_context *ac, unsigned int order, int alloc_flags,
enum compact_result compact_result,
enum compact_priority *compact_priority,
- int compaction_retries)
+ int *compaction_retries)
{
struct zone *zone;
struct zoneref *z;
@@ -3624,9 +3628,6 @@ retry:
if (page)
goto got_pg;
- if (order && compaction_made_progress(compact_result))
- compaction_retries++;
-
/* Do not loop if specifically requested */
if (gfp_mask & __GFP_NORETRY)
goto nopage;
@@ -3661,7 +3662,7 @@ retry:
if (did_some_progress > 0 &&
should_compact_retry(ac, order, alloc_flags,
compact_result, &compact_priority,
- compaction_retries))
+ &compaction_retries))
goto retry;
/* Reclaim has failed us, start killing things */
_
Patches currently in -mm which might be from vbabka@xxxxxxx are
mm-compaction-make-whole_zone-flag-ignore-cached-scanner-positions.patch
mm-compaction-cleanup-unused-functions.patch
mm-compaction-rename-compact_partial-to-compact_success.patch
mm-compaction-dont-recheck-watermarks-after-compact_success.patch
mm-compaction-add-the-ultimate-direct-compaction-priority.patch
mm-compaction-add-the-ultimate-direct-compaction-priority-fix.patch
mm-compaction-use-correct-watermark-when-checking-compaction-success.patch
mm-compaction-create-compact_gap-wrapper.patch
mm-compaction-create-compact_gap-wrapper-fix.patch
mm-compaction-use-proper-alloc_flags-in-__compaction_suitable.patch
mm-compaction-require-only-min-watermarks-for-non-costly-orders.patch
mm-compaction-require-only-min-watermarks-for-non-costly-orders-fix.patch
mm-vmscan-make-compaction_ready-more-accurate-and-readable.patch
revert-mm-oom-prevent-premature-oom-killer-invocation-for-high-order-request.patch
mm-compaction-more-reliably-increase-direct-compaction-priority.patch
mm-compaction-more-reliably-increase-direct-compaction-priority-fix.patch
mm-compaction-restrict-full-priority-to-non-costly-orders.patch
mm-compaction-make-full-priority-ignore-pageblock-suitability.patch
mm-page_alloc-pull-no_progress_loops-update-to-should_reclaim_retry.patch
mm-compaction-ignore-fragindex-from-compaction_zonelist_suitable.patch
mm-compaction-restrict-fragindex-to-costly-orders.patch
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