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| author | Vlastimil Babka <vbabka@suse.cz> | 2016-10-07 16:57:41 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-07 18:46:27 -0700 |
| commit | cf378319d335663b6722e74db0211b8af55049d5 (patch) | |
| tree | e87f81df15b4c322098412bf1bbe7230e8c1b7ab /mm/compaction.c | |
| parent | 791cae9620e35d18df2cedf2bd444920c3ecf04a (diff) | |
| download | linux-cf378319d335663b6722e74db0211b8af55049d5.tar.gz linux-cf378319d335663b6722e74db0211b8af55049d5.tar.bz2 linux-cf378319d335663b6722e74db0211b8af55049d5.zip | |
mm, compaction: rename COMPACT_PARTIAL to COMPACT_SUCCESS
COMPACT_PARTIAL has historically meant that compaction returned after
doing some work without fully compacting a zone. It however didn't
distinguish if compaction terminated because it succeeded in creating
the requested high-order page. This has changed recently and now we
only return COMPACT_PARTIAL when compaction thinks it succeeded, or the
high-order watermark check in compaction_suitable() passes and no
compaction needs to be done.
So at this point we can make the return value clearer by renaming it to
COMPACT_SUCCESS. The next patch will remove some redundant tests for
success where compaction just returned COMPACT_SUCCESS.
Link: http://lkml.kernel.org/r/20160810091226.6709-4-vbabka@suse.cz
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Tested-by: Lorenzo Stoakes <lstoakes@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/compaction.c')
| -rw-r--r-- | mm/compaction.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/mm/compaction.c b/mm/compaction.c index 8e32778fba5b..335eeeed0c91 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -1329,13 +1329,13 @@ static enum compact_result __compact_finished(struct zone *zone, struct compact_ /* Job done if page is free of the right migratetype */ if (!list_empty(&area->free_list[migratetype])) - return COMPACT_PARTIAL; + return COMPACT_SUCCESS; #ifdef CONFIG_CMA /* MIGRATE_MOVABLE can fallback on MIGRATE_CMA */ if (migratetype == MIGRATE_MOVABLE && !list_empty(&area->free_list[MIGRATE_CMA])) - return COMPACT_PARTIAL; + return COMPACT_SUCCESS; #endif /* * Job done if allocation would steal freepages from @@ -1343,7 +1343,7 @@ static enum compact_result __compact_finished(struct zone *zone, struct compact_ */ if (find_suitable_fallback(area, order, migratetype, true, &can_steal) != -1) - return COMPACT_PARTIAL; + return COMPACT_SUCCESS; } return COMPACT_NO_SUITABLE_PAGE; @@ -1367,7 +1367,7 @@ static enum compact_result compact_finished(struct zone *zone, * compaction_suitable: Is this suitable to run compaction on this zone now? * Returns * COMPACT_SKIPPED - If there are too few free pages for compaction - * COMPACT_PARTIAL - If the allocation would succeed without compaction + * COMPACT_SUCCESS - If the allocation would succeed without compaction * COMPACT_CONTINUE - If compaction should run now */ static enum compact_result __compaction_suitable(struct zone *zone, int order, @@ -1388,7 +1388,7 @@ static enum compact_result __compaction_suitable(struct zone *zone, int order, */ if (zone_watermark_ok(zone, order, watermark, classzone_idx, alloc_flags)) - return COMPACT_PARTIAL; + return COMPACT_SUCCESS; /* * Watermarks for order-0 must be met for compaction. Note the 2UL. @@ -1477,7 +1477,7 @@ static enum compact_result compact_zone(struct zone *zone, struct compact_contro ret = compaction_suitable(zone, cc->order, cc->alloc_flags, cc->classzone_idx); /* Compaction is likely to fail */ - if (ret == COMPACT_PARTIAL || ret == COMPACT_SKIPPED) + if (ret == COMPACT_SUCCESS || ret == COMPACT_SKIPPED) return ret; /* huh, compaction_suitable is returning something unexpected */ |