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vmscan: only defer compaction for failed order and higher

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Currently a failed order-9 (transparent hugepage) compaction can lead to
memory compaction being temporarily disabled for a memory zone.  Even if
we only need compaction for an order 2 allocation, eg.  for jumbo frames
networking.

The fix is relatively straightforward: keep track of the highest order at
which compaction is succeeding, and only defer compaction for orders at
which compaction is failing.

Signed-off-by: Rik van Riel <riel@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Hillf Danton <dhillf@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rik van Riel 2012-03-21 16:33:52 -07:00 committed by Linus Torvalds
parent 7be62de99a
commit aff622495c
5 changed files with 27 additions and 8 deletions
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14
include/linux/compaction.h
View file

@ -34,20 +34,26 @@ extern unsigned long compaction_suitable(struct zone *zone, int order);
* allocation success. 1 << compact_defer_limit compactions are skipped up * allocation success. 1 << compact_defer_limit compactions are skipped up
* to a limit of 1 << COMPACT_MAX_DEFER_SHIFT * to a limit of 1 << COMPACT_MAX_DEFER_SHIFT
*/ */
static inline void defer_compaction(struct zone *zone) static inline void defer_compaction(struct zone *zone, int order)
{ {
zone->compact_considered = 0; zone->compact_considered = 0;
zone->compact_defer_shift++; zone->compact_defer_shift++;
if (order < zone->compact_order_failed)
zone->compact_order_failed = order;
if (zone->compact_defer_shift > COMPACT_MAX_DEFER_SHIFT) if (zone->compact_defer_shift > COMPACT_MAX_DEFER_SHIFT)
zone->compact_defer_shift = COMPACT_MAX_DEFER_SHIFT; zone->compact_defer_shift = COMPACT_MAX_DEFER_SHIFT;
} }
/* Returns true if compaction should be skipped this time */ /* Returns true if compaction should be skipped this time */
static inline bool compaction_deferred(struct zone *zone) static inline bool compaction_deferred(struct zone *zone, int order)
{ {
unsigned long defer_limit = 1UL << zone->compact_defer_shift; unsigned long defer_limit = 1UL << zone->compact_defer_shift;
if (order < zone->compact_order_failed)
return false;
/* Avoid possible overflow */ /* Avoid possible overflow */
if (++zone->compact_considered > defer_limit) if (++zone->compact_considered > defer_limit)
zone->compact_considered = defer_limit; zone->compact_considered = defer_limit;
@ -73,11 +79,11 @@ static inline unsigned long compaction_suitable(struct zone *zone, int order)
return COMPACT_SKIPPED; return COMPACT_SKIPPED;
} }
static inline void defer_compaction(struct zone *zone) static inline void defer_compaction(struct zone *zone, int order)
{ {
} }
static inline bool compaction_deferred(struct zone *zone) static inline bool compaction_deferred(struct zone *zone, int order)
{ {
return 1; return 1;
} }

1
include/linux/mmzone.h
View file

@ -365,6 +365,7 @@ struct zone {
*/ */
unsigned int compact_considered; unsigned int compact_considered;
unsigned int compact_defer_shift; unsigned int compact_defer_shift;
int compact_order_failed;
#endif #endif
ZONE_PADDING(_pad1_) ZONE_PADDING(_pad1_)

12
mm/compaction.c
View file

@ -695,9 +695,19 @@ static int __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc)
INIT_LIST_HEAD(&cc->freepages); INIT_LIST_HEAD(&cc->freepages);
INIT_LIST_HEAD(&cc->migratepages); INIT_LIST_HEAD(&cc->migratepages);
if (cc->order < 0 || !compaction_deferred(zone)) if (cc->order < 0 || !compaction_deferred(zone, cc->order))
compact_zone(zone, cc); compact_zone(zone, cc);
if (cc->order > 0) {
int ok = zone_watermark_ok(zone, cc->order,
low_wmark_pages(zone), 0, 0);
if (ok && cc->order > zone->compact_order_failed)
zone->compact_order_failed = cc->order + 1;
/* Currently async compaction is never deferred. */
else if (!ok && cc->sync)
defer_compaction(zone, cc->order);
}
VM_BUG_ON(!list_empty(&cc->freepages)); VM_BUG_ON(!list_empty(&cc->freepages));
VM_BUG_ON(!list_empty(&cc->migratepages)); VM_BUG_ON(!list_empty(&cc->migratepages));
} }

6
mm/page_alloc.c
View file

@ -1990,7 +1990,7 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
if (!order) if (!order)
return NULL; return NULL;
if (compaction_deferred(preferred_zone)) { if (compaction_deferred(preferred_zone, order)) {
*deferred_compaction = true; *deferred_compaction = true;
return NULL; return NULL;
} }
@ -2012,6 +2012,8 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
if (page) { if (page) {
preferred_zone->compact_considered = 0; preferred_zone->compact_considered = 0;
preferred_zone->compact_defer_shift = 0; preferred_zone->compact_defer_shift = 0;
if (order >= preferred_zone->compact_order_failed)
preferred_zone->compact_order_failed = order + 1;
count_vm_event(COMPACTSUCCESS); count_vm_event(COMPACTSUCCESS);
return page; return page;
} }
@ -2028,7 +2030,7 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
* defer if the failure was a sync compaction failure. * defer if the failure was a sync compaction failure.
*/ */
if (sync_migration) if (sync_migration)
defer_compaction(preferred_zone); defer_compaction(preferred_zone, order);
cond_resched(); cond_resched();
} }

2
mm/vmscan.c
View file

@ -2198,7 +2198,7 @@ static inline bool compaction_ready(struct zone *zone, struct scan_control *sc)
* If compaction is deferred, reclaim up to a point where * If compaction is deferred, reclaim up to a point where
* compaction will have a chance of success when re-enabled * compaction will have a chance of success when re-enabled
*/ */
if (compaction_deferred(zone)) if (compaction_deferred(zone, sc->order))
return watermark_ok; return watermark_ok;
/* If compaction is not ready to start, keep reclaiming */ /* If compaction is not ready to start, keep reclaiming */