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| author | Mel Gorman <mel@csn.ul.ie> | 2007-10-16 01:25:55 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 09:43:00 -0700 |
| commit | 46dafbca2bba811665b01d8cedf911204820623c (patch) | |
| tree | c0dbc78b3da9749f257fa8756cd3133f39cd4f88 /mm | |
| parent | 5adc5be7cd1bcef6bb64f5255d2a33f20a3cf5be (diff) | |
| download | lwn-46dafbca2bba811665b01d8cedf911204820623c.tar.gz lwn-46dafbca2bba811665b01d8cedf911204820623c.zip | |
Be more agressive about stealing when MIGRATE_RECLAIMABLE allocations fallback
MIGRATE_RECLAIMABLE allocations tend to be very bursty in nature like when
updatedb starts. It is likely this will occur in situations where MAX_ORDER
blocks of pages are not free. This means that updatedb can scatter
MIGRATE_RECLAIMABLE pages throughout the address space. This patch is more
agressive about stealing blocks of pages for MIGRATE_RECLAIMABLE.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/page_alloc.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index e1d87ee1d9c6..b864584c92b4 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -821,11 +821,23 @@ retry: /* * If breaking a large block of pages, move all free - * pages to the preferred allocation list + * pages to the preferred allocation list. If falling + * back for a reclaimable kernel allocation, be more + * agressive about taking ownership of free pages */ - if (unlikely(current_order >= MAX_ORDER / 2)) { + if (unlikely(current_order >= MAX_ORDER / 2) || + start_migratetype == MIGRATE_RECLAIMABLE) { + unsigned long pages; + pages = move_freepages_block(zone, page, + start_migratetype); + + /* Claim the whole block if over half of it is free */ + if ((pages << current_order) >= (1 << (MAX_ORDER-2)) && + migratetype != MIGRATE_HIGHATOMIC) + set_pageblock_migratetype(page, + start_migratetype); + migratetype = start_migratetype; - move_freepages_block(zone, page, migratetype); } /* Remove the page from the freelists */ |