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Thu, 9 Apr 2020 15:15:42 +0000 From: Alex Belits To: "frederic@kernel.org" , "rostedt@goodmis.org" Subject: [PATCH 01/13] task_isolation: vmstat: add quiet_vmstat_sync function Thread-Topic: [PATCH 01/13] task_isolation: vmstat: add quiet_vmstat_sync function Thread-Index: AQHWDoG87dqkhBWgL0Cw8QsE6xEP5A== Date: Thu, 9 Apr 2020 15:15:42 +0000 Message-ID: References: <4473787e1b6bc3cc226067e8d122092a678b63de.camel@marvell.com> <07c25c246c55012981ec0296eee23e68c719333a.camel@marvell.com> In-Reply-To: <07c25c246c55012981ec0296eee23e68c719333a.camel@marvell.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [173.228.7.197] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 283ce317-d806-4a32-2928-08d7dc98ded4 x-ms-traffictypediagnostic: BYAPR18MB2758: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:1186; x-forefront-prvs: 0368E78B5B x-forefront-antispam-report: CIP:255.255.255.255; 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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 In commit f01f17d3705b ("mm, vmstat: make quiet_vmstat lighter") the quiet_vmstat() function became asynchronous, in the sense that the vmstat work was still scheduled to run on the core when the function returned. For task isolation, we need a synchronous version of the function that guarantees that the vmstat worker will not run on the core on return from the function. Add a quiet_vmstat_sync() function with that semantic. Signed-off-by: Chris Metcalf Signed-off-by: Alex Belits --- include/linux/vmstat.h | 2 ++ mm/vmstat.c | 9 +++++++++ 2 files changed, 11 insertions(+) diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h index 292485f3d24d..2bc5e85f2514 100644 --- a/include/linux/vmstat.h +++ b/include/linux/vmstat.h @@ -270,6 +270,7 @@ extern void __dec_zone_state(struct zone *, enum zone_stat_item); extern void __dec_node_state(struct pglist_data *, enum node_stat_item); void quiet_vmstat(void); +void quiet_vmstat_sync(void); void cpu_vm_stats_fold(int cpu); void refresh_zone_stat_thresholds(void); @@ -372,6 +373,7 @@ static inline void __dec_node_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 quiet_vmstat_sync(void) { } static inline void drain_zonestat(struct zone *zone, struct per_cpu_pageset *pset) { } diff --git a/mm/vmstat.c b/mm/vmstat.c index 78d53378db99..1fa0b2d04afa 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1870,6 +1870,15 @@ void quiet_vmstat(void) refresh_cpu_vm_stats(false); } +/* + * Synchronously quiet vmstat so the work is guaranteed not to run on return. + */ +void quiet_vmstat_sync(void) +{ + cancel_delayed_work_sync(this_cpu_ptr(&vmstat_work)); + refresh_cpu_vm_stats(false); +} + /* * 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