The patch titled
VM statistics: Make timer deferrable
has been added to the -mm tree. Its filename is
vm-statistics-make-timer-deferrable.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: VM statistics: Make timer deferrable
From: Christoph Lameter <clameter@xxxxxxx>
VM statistics updates do not matter if the kernel is in idle powersaving
mode. So allow the timer to be deferred.
It would be better though if we could switch the timer between deferrable
and nondeferrable based on differentials present. The timer would start
out nondeferrable and if we find that there were no updates in the last
statistics interval then we would switch the timer to deferrable. If the
timer later finds again that there are differentials then go to
nondeferrable again.
And yet another way would be to run the timer shortly before going to idle?
The solution here means that the VM counters may be slightly off during
idle since differentials may be still pending while the timer is deferred.
Signed-off-by: Christoph Lameter <clameter@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmstat.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/vmstat.c~vm-statistics-make-timer-deferrable mm/vmstat.c
--- a/mm/vmstat.c~vm-statistics-make-timer-deferrable
+++ a/mm/vmstat.c
@@ -698,7 +698,7 @@ static void __devinit start_cpu_timer(in
{
struct delayed_work *vmstat_work = &per_cpu(vmstat_work, cpu);
- INIT_DELAYED_WORK(vmstat_work, vmstat_update);
+ INIT_DELAYED_WORK_DEFERRABLE(vmstat_work, vmstat_update);
schedule_delayed_work_on(cpu, vmstat_work, HZ + cpu);
}
_
Patches currently in -mm which might be from clameter@xxxxxxx are
origin.patch
quicklist-support-for-ia64.patch
quicklist-support-for-x86_64.patch
slub-i386-support.patch
vm-statistics-make-timer-deferrable.patch
change-zonelist-order-zonelist-order-selection-logic.patch
change-zonelist-order-v6-zonelist-fix.patch
change-zonelist-order-auto-configuration.patch
change-zonelist-order-documentaion.patch
group-short-lived-and-reclaimable-kernel-allocations-use-slab_account_reclaim-to-determine-when-__gfp_reclaimable-should-be-used.patch
group-short-lived-and-reclaimable-kernel-allocations-use-slab_account_reclaim-to-determine-when-__gfp_reclaimable-should-be-used-fix.patch
slub-mm-only-make-slub-the-default-slab-allocator.patch
slub-exploit-page-mobility-to-increase-allocation-order.patch
slub-reduce-antifrag-max-order.patch
slub-reduce-antifrag-max-order-use-antifrag-constant-instead-of-hardcoding-page-order.patch
define-percpu-smp-cacheline-align-interface.patch
call-percpu-smp-cacheline-algin-interface.patch
remove-constructor-from-buffer_head.patch
mm-implement-swap-prefetching.patch
revoke-core-code.patch
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