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authorJohannes Weiner <hannes@cmpxchg.org>2009-01-06 14:39:17 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-06 15:59:00 -0800
commit4917e5d0499b5ae7b26b56fccaefddf9aec9369c (patch)
tree78f55c2d3019d1811b5447cae130c0f647916a37 /mm/memory.c
parent64cdd548ffe26849d4cd113ac640f60606063b14 (diff)
mm: more likely reclaim MADV_SEQUENTIAL mappings
File pages mapped only in sequentially read mappings are perfect reclaim canditates. This patch makes these mappings behave like weak references, their pages will be reclaimed unless they have a strong reference from a normal mapping as well. It changes the reclaim and the unmap path where they check if the page has been referenced. In both cases, accesses through sequentially read mappings will be ignored. Benchmark results from KOSAKI Motohiro: http://marc.info/?l=linux-mm&m=122485301925098&w=2 Signed-off-by: Johannes Weiner <hannes@saeurebad.de> Signed-off-by: Rik van Riel <riel@redhat.com> Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory.c')
-rw-r--r--mm/memory.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 5e0e91cc6b67..99e8d5c7b312 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -767,7 +767,8 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
else {
if (pte_dirty(ptent))
set_page_dirty(page);
- if (pte_young(ptent))
+ if (pte_young(ptent) &&
+ likely(!VM_SequentialReadHint(vma)))
mark_page_accessed(page);
file_rss--;
}