diff options
Diffstat (limited to 'mm/compaction.c')
| -rw-r--r-- | mm/compaction.c | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/mm/compaction.c b/mm/compaction.c index 018f08da99a2..7077b81a4893 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -898,6 +898,16 @@ static bool suitable_migration_target(struct page *page) } /* + * Test whether the free scanner has reached the same or lower pageblock than + * the migration scanner, and compaction should thus terminate. + */ +static inline bool compact_scanners_met(struct compact_control *cc) +{ + return (cc->free_pfn >> pageblock_order) + <= (cc->migrate_pfn >> pageblock_order); +} + +/* * Based on information in the current compact_control, find blocks * suitable for isolating free pages from and then isolate them. */ @@ -1127,12 +1137,8 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone, } acct_isolated(zone, cc); - /* - * Record where migration scanner will be restarted. If we end up in - * the same pageblock as the free scanner, make the scanners fully - * meet so that compact_finished() terminates compaction. - */ - cc->migrate_pfn = (end_pfn <= cc->free_pfn) ? low_pfn : cc->free_pfn; + /* Record where migration scanner will be restarted. */ + cc->migrate_pfn = low_pfn; return cc->nr_migratepages ? ISOLATE_SUCCESS : ISOLATE_NONE; } @@ -1147,7 +1153,7 @@ static int __compact_finished(struct zone *zone, struct compact_control *cc, return COMPACT_PARTIAL; /* Compaction run completes if the migrate and free scanner meet */ - if (cc->free_pfn <= cc->migrate_pfn) { + if (compact_scanners_met(cc)) { /* Let the next compaction start anew. */ zone->compact_cached_migrate_pfn[0] = zone->zone_start_pfn; zone->compact_cached_migrate_pfn[1] = zone->zone_start_pfn; @@ -1376,7 +1382,7 @@ static int compact_zone(struct zone *zone, struct compact_control *cc) * migrate_pages() may return -ENOMEM when scanners meet * and we want compact_finished() to detect it */ - if (err == -ENOMEM && cc->free_pfn > cc->migrate_pfn) { + if (err == -ENOMEM && !compact_scanners_met(cc)) { ret = COMPACT_PARTIAL; goto out; } |