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authorChristoph Lameter <cl@linux.com>2016-01-15 02:21:40 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-15 03:00:49 +0300
commit0eb77e9880321915322d42913c3b53241739c8aa (patch)
tree5beff1411a4178b6157b78fcd6ef7302050f2641 /include/linux/vmstat.h
parent686739f6af5e8d5687ffebbf1193ff066aada6d9 (diff)
downloadlinux-0eb77e9880321915322d42913c3b53241739c8aa.tar.xz
vmstat: make vmstat_updater deferrable again and shut down on idle
Currently the vmstat updater is not deferrable as a result of commit ba4877b9ca51 ("vmstat: do not use deferrable delayed work for vmstat_update"). This in turn can cause multiple interruptions of the applications because the vmstat updater may run at Make vmstate_update deferrable again and provide a function that folds the differentials when the processor is going to idle mode thus addressing the issue of the above commit in a clean way. Note that the shepherd thread will continue scanning the differentials from another processor and will reenable the vmstat workers if it detects any changes. Fixes: ba4877b9ca51 ("vmstat: do not use deferrable delayed work for vmstat_update") Signed-off-by: Christoph Lameter <cl@linux.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/vmstat.h')
-rw-r--r--include/linux/vmstat.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index 3e5d9075960f..73fae8c4a5fb 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -189,6 +189,7 @@ extern void __inc_zone_state(struct zone *, enum zone_stat_item);
extern void dec_zone_state(struct zone *, enum zone_stat_item);
extern void __dec_zone_state(struct zone *, enum zone_stat_item);
+void quiet_vmstat(void);
void cpu_vm_stats_fold(int cpu);
void refresh_zone_stat_thresholds(void);
@@ -249,6 +250,7 @@ static inline void __dec_zone_page_state(struct page *page,
static inline void refresh_zone_stat_thresholds(void) { }
static inline void cpu_vm_stats_fold(int cpu) { }
+static inline void quiet_vmstat(void) { }
static inline void drain_zonestat(struct zone *zone,
struct per_cpu_pageset *pset) { }