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| author | Andrea Arcangeli <aarcange@redhat.com> | 2010-05-21 01:14:04 +0200 |
|---|---|---|
| committer | Andrea Arcangeli <aarcange@redhat.com> | 2010-05-20 23:16:49 +0000 |
| commit | 0ca2c9c3a96392bdd7ccbc45b52cbe06e986cc17 (patch) | |
| tree | 609784ce951f9000f61129d78e8ce00493530451 | |
| parent | 387f91bc797fd90c84e92378aa115cd86eca3fcc (diff) | |
transhuge isolate_migratepages()THP-25-anon_vma_chain
It's not worth migrating transparent hugepages during compaction. Those
hugepages don't create fragmentation.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
| -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 94cce51b0b35..c5c99e0422f5 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -271,10 +271,25 @@ static unsigned long isolate_migratepages(struct zone *zone, if (PageBuddy(page)) 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); |