The patch titled
mm: unlockless reclaim
has been removed from the -mm tree. Its filename was
mm-unlockless-reclaim.patch
This patch was dropped because it doesn't compile
------------------------------------------------------
Subject: mm: unlockless reclaim
From: Nick Piggin <npiggin@xxxxxxx>
unlock_page() is fairly expensive. It can be avoided in page reclaim.
Signed-off-by: Nick Piggin <npiggin@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff -puN mm/vmscan.c~mm-unlockless-reclaim mm/vmscan.c
--- a/mm/vmscan.c~mm-unlockless-reclaim
+++ a/mm/vmscan.c
@@ -589,7 +589,14 @@ static unsigned long shrink_page_list(st
goto keep_locked;
free_it:
- unlock_page(page);
+ /*
+ * At this point, we have no other references and there is
+ * no way to pick any more up (removed from LRU, removed
+ * from pagecache). Can use non-atomic bitops now (and
+ * we obviously don't have to worry about waking up a process
+ * waiting on the page lock, because there are no references.
+ */
+ __clear_page_locked(page);
nr_reclaimed++;
if (!pagevec_add(&freed_pvec, page))
__pagevec_release_nonlru(&freed_pvec);
_
Patches currently in -mm which might be from npiggin@xxxxxxx are
nfs-use-gfp_nofs-preloads-for-radix-tree-insertion.patch
rd-fix-data-corruption-on-memory-pressure.patch
slub-use-non-atomic-bit-unlock.patch
radix-tree-avoid-atomic-allocations-for-preloaded-insertions.patch
mm-page-trylock-rename.patch
fs-buffer-trylock-rename.patch
mm-unlockless-reclaim.patch
fs-introduce-write_begin-write_end-and-perform_write-aops-revoke.patch
fs-introduce-write_begin-write_end-and-perform_write-aops-revoke-fix.patch
reiser4.patch
-
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