diff options
| -rw-r--r-- | mm/compaction.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/mm/compaction.c b/mm/compaction.c index 38ce48805c0..b27802e04b9 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -153,7 +153,6 @@ static void isolate_freepages(struct zone *zone, * pages on cc->migratepages. We stop searching if the migrate * and free page scanners meet or enough free pages are isolated. */ - spin_lock_irqsave(&zone->lock, flags); for (; pfn > low_pfn && cc->nr_migratepages > nr_freepages; pfn -= pageblock_nr_pages) { unsigned long isolated; @@ -176,9 +175,19 @@ static void isolate_freepages(struct zone *zone, if (!suitable_migration_target(page)) continue; - /* Found a block suitable for isolating free pages from */ - isolated = isolate_freepages_block(zone, pfn, freelist); - nr_freepages += isolated; + /* + * Found a block suitable for isolating free pages from. Now + * we disabled interrupts, double check things are ok and + * isolate the pages. This is to minimise the time IRQs + * are disabled + */ + isolated = 0; + spin_lock_irqsave(&zone->lock, flags); + if (suitable_migration_target(page)) { + isolated = isolate_freepages_block(zone, pfn, freelist); + nr_freepages += isolated; + } + spin_unlock_irqrestore(&zone->lock, flags); /* * Record the highest PFN we isolated pages from. When next @@ -188,7 +197,6 @@ static void isolate_freepages(struct zone *zone, if (isolated) high_pfn = max(high_pfn, pfn); } - spin_unlock_irqrestore(&zone->lock, flags); /* split_free_page does not map the pages */ list_for_each_entry(page, freelist, lru) { |