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Wed, 22 Jul 2020 14:48:55 +0000 From: Alex Belits To: "frederic@kernel.org" , "rostedt@goodmis.org" Subject: [PATCH v4 02/13] task_isolation: vmstat: add vmstat_idle function Thread-Topic: [PATCH v4 02/13] task_isolation: vmstat: add vmstat_idle function Thread-Index: AQHWYDc5m+yfBf+oREWWYu7pQOOLOw== Date: Wed, 22 Jul 2020 14:48:55 +0000 Message-ID: <072c0cd559c6ad91898e4982bc32cc8918a3dde0.camel@marvell.com> References: <04be044c1bcd76b7438b7563edc35383417f12c8.camel@marvell.com> In-Reply-To: <04be044c1bcd76b7438b7563edc35383417f12c8.camel@marvell.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: kernel.org; dkim=none (message not signed) header.d=none;kernel.org; dmarc=none action=none header.from=marvell.com; x-originating-ip: [173.228.7.197] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: f637b885-826a-4f4c-9d97-08d82e4e5c0d x-ms-traffictypediagnostic: MWHPR18MB1279: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:4502; 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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 7823be8cd3ba2e66308f334a2e47f60ba7829e0b Mon Sep 17 00:00:00 2001 From: Chris Metcalf Date: Sat, 1 Feb 2020 08:05:45 +0000 Subject: [PATCH 02/13] task_isolation: vmstat: add vmstat_idle function 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 ded16dfd21fa..97bc9ed92036 100644 --- a/include/linux/vmstat.h +++ b/include/linux/vmstat.h @@ -273,6 +273,7 @@ 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); @@ -376,6 +377,7 @@ 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 93534f8537ca..f3693ef0a958 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1898,6 +1898,16 @@ 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 -- 2.26.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel