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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "linux-arch@vger.kernel.org" , "pauld@redhat.com" , "catalin.marinas@arm.com" , "peterz@infradead.org" , Prasun Kapoor , "mtosatti@redhat.com" , "linux-kernel@vger.kernel.org" , "rostedt@goodmis.org" , "davem@davemloft.net" , "leon@sidebranch.com" , "netdev@vger.kernel.org" , "peterx@redhat.com" , "trix@redhat.com" , "tglx@linutronix.de" , "linux-api@vger.kernel.org" , "will@kernel.org" , "mingo@kernel.org" , "linux-arm-kernel@lists.infradead.org" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+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 300ce6648923..24392a957cfc 100644 --- a/include/linux/vmstat.h +++ b/include/linux/vmstat.h @@ -285,6 +285,7 @@ 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); @@ -393,6 +394,7 @@ 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 43999caf47a4..5b0ad7ed65f7 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1945,6 +1945,16 @@ 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