The patch titled
mm: move pagevec stripping to save unlock-relock
has been added to the -mm tree. Its filename is
mm-move-pagevec-stripping-to-save-unlock-relock.patch
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------------------------------------------------------
Subject: mm: move pagevec stripping to save unlock-relock
From: Johannes Weiner <hannes@xxxxxxxxxxx>
In shrink_active_list() after the deactivation loop, we strip buffer heads
from the potentially remaining pages in the pagevec.
Currently, this drops the zone's lru lock for stripping, only to reacquire
it again afterwards to update statistics.
It is not necessary to strip the pages before updating the stats, so move
the whole thing out of the protected region and save the extra locking.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Reviewed-by: MinChan Kim <minchan.kim@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff -puN mm/vmscan.c~mm-move-pagevec-stripping-to-save-unlock-relock mm/vmscan.c
--- a/mm/vmscan.c~mm-move-pagevec-stripping-to-save-unlock-relock
+++ a/mm/vmscan.c
@@ -1298,14 +1298,11 @@ static void shrink_active_list(unsigned
}
__mod_zone_page_state(zone, NR_LRU_BASE + lru, pgmoved);
pgdeactivate += pgmoved;
- if (buffer_heads_over_limit) {
- spin_unlock_irq(&zone->lru_lock);
- pagevec_strip(&pvec);
- spin_lock_irq(&zone->lru_lock);
- }
__count_zone_vm_events(PGREFILL, zone, pgscanned);
__count_vm_events(PGDEACTIVATE, pgdeactivate);
spin_unlock_irq(&zone->lru_lock);
+ if (buffer_heads_over_limit)
+ pagevec_strip(&pvec);
if (vm_swap_full())
pagevec_swap_free(&pvec);
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
linux-next.patch
cifs-use-kzfree.patch
md-use-kzfree.patch
s390-use-kzfree.patch
usb-use-kzfree.patch
crypto-use-kzfree.patch
vmscan-rename-scmay_swap-to-may_unmap.patch
mm-introduce-for_each_populated_zone-macro.patch
mm-introduce-for_each_populated_zone-macro-cleanup.patch
mm-shrink_all_memory-use-scnr_reclaimed.patch
mm-shrink_all_memory-use-scnr_reclaimed-checkpatch-fixes.patch
vmscan-clip-swap_cluster_max-in-shrink_all_memory.patch
vmscan-respect-higher-order-in-zone_reclaim.patch
mm-move-pagevec-stripping-to-save-unlock-relock.patch
ecryptfs-use-kzfree.patch
memcg-remove-mem_cgroup_calc_mapped_ratio-take2.patch
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