The patch titled
Subject: mm, compaction: restrict full priority to non-costly orders
has been added to the -mm tree. Its filename is
mm-compaction-restrict-full-priority-to-non-costly-orders.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-compaction-restrict-full-priority-to-non-costly-orders.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-compaction-restrict-full-priority-to-non-costly-orders.patch
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From: Vlastimil Babka <vbabka@xxxxxxx>
Subject: mm, compaction: restrict full priority to non-costly orders
The new ultimate compaction priority disables some heuristics, which may
result in excessive cost. This is fine for non-costly orders where we
want to try hard before resulting for OOM, but might be disruptive for
costly orders which do not trigger OOM and should generally have some
fallback. Thus, we disable the full priority for costly orders.
Suggested-by: Michal Hocko <mhocko@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/20160906135258.18335-4-vbabka@xxxxxxx
Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/compaction.h | 1 +
mm/page_alloc.c | 5 ++++-
2 files changed, 5 insertions(+), 1 deletion(-)
diff -puN include/linux/compaction.h~mm-compaction-restrict-full-priority-to-non-costly-orders include/linux/compaction.h
--- a/include/linux/compaction.h~mm-compaction-restrict-full-priority-to-non-costly-orders
+++ a/include/linux/compaction.h
@@ -9,6 +9,7 @@ enum compact_priority {
COMPACT_PRIO_SYNC_FULL,
MIN_COMPACT_PRIORITY = COMPACT_PRIO_SYNC_FULL,
COMPACT_PRIO_SYNC_LIGHT,
+ MIN_COMPACT_COSTLY_PRIORITY = COMPACT_PRIO_SYNC_LIGHT,
DEF_COMPACT_PRIORITY = COMPACT_PRIO_SYNC_LIGHT,
COMPACT_PRIO_ASYNC,
INIT_COMPACT_PRIORITY = COMPACT_PRIO_ASYNC
diff -puN mm/page_alloc.c~mm-compaction-restrict-full-priority-to-non-costly-orders mm/page_alloc.c
--- a/mm/page_alloc.c~mm-compaction-restrict-full-priority-to-non-costly-orders
+++ a/mm/page_alloc.c
@@ -3163,6 +3163,7 @@ should_compact_retry(struct alloc_contex
int compaction_retries)
{
int max_retries = MAX_COMPACT_RETRIES;
+ int min_priority;
if (!order)
return false;
@@ -3202,7 +3203,9 @@ should_compact_retry(struct alloc_contex
* if we exhausted all retries at the lower priorities
*/
check_priority:
- if (*compact_priority > MIN_COMPACT_PRIORITY) {
+ min_priority = (order > PAGE_ALLOC_COSTLY_ORDER) ?
+ MIN_COMPACT_COSTLY_PRIORITY : MIN_COMPACT_PRIORITY;
+ if (*compact_priority > min_priority) {
(*compact_priority)--;
return true;
}
_
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-restrict-full-priority-to-non-costly-orders.patch
mm-compaction-make-full-priority-ignore-pageblock-suitability.patch
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