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| author | Andrea Arcangeli <aarcange@redhat.com> | 2011-01-13 15:47:08 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-13 17:32:45 -0800 |
| commit | bc835011afbea3957217ee716093d791fb2fe44f (patch) | |
| tree | 50d1f2ffb4c1ff8cef4c9fb7fb115faeed0d0339 | |
| parent | 5d6892407cab23d4bf2f6de065ca351a53849323 (diff) | |
| download | linux-bc835011afbea3957217ee716093d791fb2fe44f.tar.bz2 | |
thp: transhuge isolate_migratepages()
It's not worth migrating transparent hugepages during compaction. Those
hugepages don't create fragmentation.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-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>
| -rw-r--r-- | mm/compaction.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/mm/compaction.c b/mm/compaction.c index b0fbfdfad298..da25b5a2e476 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -295,10 +295,25 @@ static unsigned long isolate_migratepages(struct zone *zone, continue; } + if (!PageLRU(page)) + continue; + + /* + * PageLRU is set, and lru_lock excludes isolation, + * splitting and collapsing (collapsing has already + * happened if PageLRU is set). + */ + if (PageTransHuge(page)) { + low_pfn += (1 << compound_order(page)) - 1; + continue; + } + /* Try isolate the page */ if (__isolate_lru_page(page, ISOLATE_BOTH, 0) != 0) continue; + VM_BUG_ON(PageTransCompound(page)); + /* Successfully isolated */ del_page_from_lru_list(zone, page, page_lru(page)); list_add(&page->lru, migratelist); |