The patch titled
Subject: vmstat: make vmstat_update deferrable
has been added to the -mm tree. Its filename is
vmstat-make-vmstat_update-deferrable.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/vmstat-make-vmstat_update-deferrable.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/vmstat-make-vmstat_update-deferrable.patch
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From: Michal Hocko <mhocko@xxxxxxxx>
Subject: vmstat: make vmstat_update deferrable
0eb77e988032 ("vmstat: make vmstat_updater deferrable again and shut down
on idle") made vmstat_shepherd deferrable. vmstat_update itself is still
useing standard timer which might interrupt idle task. This is possible
because "mm, vmstat: make quiet_vmstat lighter" removed
cancel_delayed_work from the quiet_vmstat. Change vmstat_work to use
DEFERRABLE_WORK to prevent from pointless wakeups from the idle context.
Acked-by: Christoph Lameter <cl@xxxxxxxxx>
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Mike Galbraith <umgwanakikbuti@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmstat.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/vmstat.c~vmstat-make-vmstat_update-deferrable mm/vmstat.c
--- a/mm/vmstat.c~vmstat-make-vmstat_update-deferrable
+++ a/mm/vmstat.c
@@ -1512,7 +1512,7 @@ static void __init start_shepherd_timer(
int cpu;
for_each_possible_cpu(cpu)
- INIT_DELAYED_WORK(per_cpu_ptr(&vmstat_work, cpu),
+ INIT_DEFERRABLE_WORK(per_cpu_ptr(&vmstat_work, cpu),
vmstat_update);
if (!alloc_cpumask_var(&cpu_stat_off, GFP_KERNEL))
_
Patches currently in -mm which might be from mhocko@xxxxxxxx are
mm-vmstat-make-quiet_vmstat-lighter.patch
vmstat-make-vmstat_update-deferrable.patch
mm-oom-rework-oom-detection.patch
mm-throttle-on-io-only-when-there-are-too-many-dirty-and-writeback-pages.patch
mm-use-watermak-checks-for-__gfp_repeat-high-order-allocations.patch
mm-oom-introduce-oom-reaper.patch
mm-oom-introduce-oom-reaper-v4.patch
oom-reaper-handle-anonymous-mlocked-pages.patch
oom-clear-tif_memdie-after-oom_reaper-managed-to-unmap-the-address-space.patch
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