diff options
Diffstat (limited to 'mm/compaction.c')
| -rw-r--r-- | mm/compaction.c | 50 |
1 files changed, 35 insertions, 15 deletions
diff --git a/mm/compaction.c b/mm/compaction.c index dba02dec7195..b6f145ed7ae1 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -200,7 +200,8 @@ static void reset_cached_positions(struct zone *zone) { zone->compact_cached_migrate_pfn[0] = zone->zone_start_pfn; zone->compact_cached_migrate_pfn[1] = zone->zone_start_pfn; - zone->compact_cached_free_pfn = zone_end_pfn(zone); + zone->compact_cached_free_pfn = + round_down(zone_end_pfn(zone) - 1, pageblock_nr_pages); } /* @@ -552,13 +553,17 @@ unsigned long isolate_freepages_range(struct compact_control *cc, unsigned long start_pfn, unsigned long end_pfn) { - unsigned long isolated, pfn, block_end_pfn; + unsigned long isolated, pfn, block_start_pfn, block_end_pfn; LIST_HEAD(freelist); pfn = start_pfn; + block_start_pfn = pfn & ~(pageblock_nr_pages - 1); + if (block_start_pfn < cc->zone->zone_start_pfn) + block_start_pfn = cc->zone->zone_start_pfn; block_end_pfn = ALIGN(pfn + 1, pageblock_nr_pages); for (; pfn < end_pfn; pfn += isolated, + block_start_pfn = block_end_pfn, block_end_pfn += pageblock_nr_pages) { /* Protect pfn from changing by isolate_freepages_block */ unsigned long isolate_start_pfn = pfn; @@ -571,11 +576,13 @@ isolate_freepages_range(struct compact_control *cc, * scanning range to right one. */ if (pfn >= block_end_pfn) { + block_start_pfn = pfn & ~(pageblock_nr_pages - 1); block_end_pfn = ALIGN(pfn + 1, pageblock_nr_pages); block_end_pfn = min(block_end_pfn, end_pfn); } - if (!pageblock_pfn_to_page(pfn, block_end_pfn, cc->zone)) + if (!pageblock_pfn_to_page(block_start_pfn, + block_end_pfn, cc->zone)) break; isolated = isolate_freepages_block(cc, &isolate_start_pfn, @@ -861,18 +868,23 @@ unsigned long isolate_migratepages_range(struct compact_control *cc, unsigned long start_pfn, unsigned long end_pfn) { - unsigned long pfn, block_end_pfn; + unsigned long pfn, block_start_pfn, block_end_pfn; /* Scan block by block. First and last block may be incomplete */ pfn = start_pfn; + block_start_pfn = pfn & ~(pageblock_nr_pages - 1); + if (block_start_pfn < cc->zone->zone_start_pfn) + block_start_pfn = cc->zone->zone_start_pfn; block_end_pfn = ALIGN(pfn + 1, pageblock_nr_pages); for (; pfn < end_pfn; pfn = block_end_pfn, + block_start_pfn = block_end_pfn, block_end_pfn += pageblock_nr_pages) { block_end_pfn = min(block_end_pfn, end_pfn); - if (!pageblock_pfn_to_page(pfn, block_end_pfn, cc->zone)) + if (!pageblock_pfn_to_page(block_start_pfn, + block_end_pfn, cc->zone)) continue; pfn = isolate_migratepages_block(cc, pfn, block_end_pfn, @@ -1090,7 +1102,9 @@ int sysctl_compact_unevictable_allowed __read_mostly = 1; static isolate_migrate_t isolate_migratepages(struct zone *zone, struct compact_control *cc) { - unsigned long low_pfn, end_pfn; + unsigned long block_start_pfn; + unsigned long block_end_pfn; + unsigned long low_pfn; unsigned long isolate_start_pfn; struct page *page; const isolate_mode_t isolate_mode = @@ -1102,16 +1116,21 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone, * initialized by compact_zone() */ low_pfn = cc->migrate_pfn; + block_start_pfn = cc->migrate_pfn & ~(pageblock_nr_pages - 1); + if (block_start_pfn < zone->zone_start_pfn) + block_start_pfn = zone->zone_start_pfn; /* Only scan within a pageblock boundary */ - end_pfn = ALIGN(low_pfn + 1, pageblock_nr_pages); + block_end_pfn = ALIGN(low_pfn + 1, pageblock_nr_pages); /* * Iterate over whole pageblocks until we find the first suitable. * Do not cross the free scanner. */ - for (; end_pfn <= cc->free_pfn; - low_pfn = end_pfn, end_pfn += pageblock_nr_pages) { + for (; block_end_pfn <= cc->free_pfn; + low_pfn = block_end_pfn, + block_start_pfn = block_end_pfn, + block_end_pfn += pageblock_nr_pages) { /* * This can potentially iterate a massively long zone with @@ -1122,7 +1141,8 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone, && compact_should_abort(cc)) break; - page = pageblock_pfn_to_page(low_pfn, end_pfn, zone); + page = pageblock_pfn_to_page(block_start_pfn, block_end_pfn, + zone); if (!page) continue; @@ -1141,8 +1161,8 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone, /* Perform the isolation */ isolate_start_pfn = low_pfn; - low_pfn = isolate_migratepages_block(cc, low_pfn, end_pfn, - isolate_mode); + low_pfn = isolate_migratepages_block(cc, low_pfn, + block_end_pfn, isolate_mode); if (!low_pfn || cc->contended) { acct_isolated(zone, cc); @@ -1358,11 +1378,11 @@ static int compact_zone(struct zone *zone, struct compact_control *cc) */ cc->migrate_pfn = zone->compact_cached_migrate_pfn[sync]; cc->free_pfn = zone->compact_cached_free_pfn; - if (cc->free_pfn < start_pfn || cc->free_pfn > end_pfn) { - cc->free_pfn = end_pfn & ~(pageblock_nr_pages-1); + if (cc->free_pfn < start_pfn || cc->free_pfn >= end_pfn) { + cc->free_pfn = round_down(end_pfn - 1, pageblock_nr_pages); zone->compact_cached_free_pfn = cc->free_pfn; } - if (cc->migrate_pfn < start_pfn || cc->migrate_pfn > end_pfn) { + if (cc->migrate_pfn < start_pfn || cc->migrate_pfn >= end_pfn) { cc->migrate_pfn = start_pfn; zone->compact_cached_migrate_pfn[0] = cc->migrate_pfn; zone->compact_cached_migrate_pfn[1] = cc->migrate_pfn; |