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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Chris Metcalf This function checks to see if a vmstat worker is not running, and the vmstat diffs don't require an update. The function is called from the task-isolation code to see if we need to actually do some work to quiet vmstat. Signed-off-by: Chris Metcalf Signed-off-by: Alex Belits --- include/linux/vmstat.h | 2 ++ mm/vmstat.c | 10 ++++++++++ 2 files changed, 12 insertions(+) diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h index 2bc5e85f2514..66d9ae32cf07 100644 --- a/include/linux/vmstat.h +++ b/include/linux/vmstat.h @@ -271,6 +271,7 @@ extern void __dec_node_state(struct pglist_data *, enum node_stat_item); void quiet_vmstat(void); void quiet_vmstat_sync(void); +bool vmstat_idle(void); void cpu_vm_stats_fold(int cpu); void refresh_zone_stat_thresholds(void); @@ -374,6 +375,7 @@ 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 quiet_vmstat_sync(void) { } +static inline bool vmstat_idle(void) { return true; } static inline void drain_zonestat(struct zone *zone, struct per_cpu_pageset *pset) { } diff --git a/mm/vmstat.c b/mm/vmstat.c index 1fa0b2d04afa..5c4aec651062 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1879,6 +1879,16 @@ void quiet_vmstat_sync(void) refresh_cpu_vm_stats(false); } +/* + * Report on whether vmstat processing is quiesced on the core currently: + * no vmstat worker running and no vmstat updates to perform. + */ +bool vmstat_idle(void) +{ + return !delayed_work_pending(this_cpu_ptr(&vmstat_work)) && + !need_update(smp_processor_id()); +} + /* * Shepherd worker thread that checks the * differentials of processors that have their worker -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel