From: Alex Belits <abelits@marvell.com> To: "frederic@kernel.org" <frederic@kernel.org>, "rostedt@goodmis.org" <rostedt@goodmis.org> Cc: Prasun Kapoor <pkapoor@marvell.com>, "mingo@kernel.org" <mingo@kernel.org>, "davem@davemloft.net" <davem@davemloft.net>, "linux-api@vger.kernel.org" <linux-api@vger.kernel.org>, "peterz@infradead.org" <peterz@infradead.org>, "linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>, "catalin.marinas@arm.com" <catalin.marinas@arm.com>, "tglx@linutronix.de" <tglx@linutronix.de>, "will@kernel.org" <will@kernel.org>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "netdev@vger.kernel.org" <netdev@vger.kernel.org> Subject: [PATCH v3 09/13] task_isolation: don't interrupt CPUs with tick_nohz_full_kick_cpu() Date: Thu, 9 Apr 2020 15:25:37 +0000 Message-ID: <eb1f4ecbda4aa49a23bc459a37b8f160828f2919.camel@marvell.com> (raw) In-Reply-To: <07c25c246c55012981ec0296eee23e68c719333a.camel@marvell.com> From: Yuri Norov <ynorov@marvell.com> For nohz_full CPUs the desirable behavior is to receive interrupts generated by tick_nohz_full_kick_cpu(). But for hard isolation it's obviously not desirable because it breaks isolation. This patch adds check for it. Signed-off-by: Yuri Norov <ynorov@marvell.com> [abelits@marvell.com: updated, only exclude CPUs running isolated tasks] Signed-off-by: Alex Belits <abelits@marvell.com> --- kernel/time/tick-sched.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 1d4dec9d3ee7..8488c2825a45 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -20,6 +20,7 @@ #include <linux/sched/clock.h> #include <linux/sched/stat.h> #include <linux/sched/nohz.h> +#include <linux/isolation.h> #include <linux/module.h> #include <linux/irq_work.h> #include <linux/posix-timers.h> @@ -262,7 +263,8 @@ static void tick_nohz_full_kick(void) */ void tick_nohz_full_kick_cpu(int cpu) { - if (!tick_nohz_full_cpu(cpu)) + smp_rmb(); + if (!tick_nohz_full_cpu(cpu) || task_isolation_on_cpu(cpu)) return; irq_work_queue_on(&per_cpu(nohz_full_kick_work, cpu), cpu); -- 2.20.1
next prev parent reply index Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-03-04 16:01 [PATCH 00/12] "Task_isolation" mode Alex Belits 2020-03-04 16:03 ` [PATCH 01/12] task_isolation: vmstat: add quiet_vmstat_sync function Alex Belits 2020-03-04 16:04 ` [PATCH 02/12] task_isolation: vmstat: add vmstat_idle function Alex Belits 2020-03-04 16:07 ` [PATCH 03/12] task_isolation: userspace hard isolation from kernel Alex Belits 2020-03-05 18:33 ` Frederic Weisbecker 2020-03-08 5:32 ` [EXT] " Alex Belits 2020-04-28 14:12 ` Marcelo Tosatti 2020-03-06 15:26 ` Frederic Weisbecker 2020-03-08 6:06 ` [EXT] " Alex Belits 2020-03-06 16:00 ` Frederic Weisbecker 2020-03-08 7:16 ` [EXT] " Alex Belits 2020-03-04 16:08 ` [PATCH 04/12] task_isolation: Add task isolation hooks to arch-independent code Alex Belits 2020-03-04 16:09 ` [PATCH 05/12] task_isolation: arch/x86: enable task isolation functionality Alex Belits 2020-03-04 16:10 ` [PATCH 06/12] task_isolation: arch/arm64: " Alex Belits 2020-03-04 16:31 ` Mark Rutland 2020-03-08 4:48 ` [EXT] " Alex Belits 2020-03-04 16:11 ` [PATCH 07/12] task_isolation: arch/arm: " Alex Belits 2020-03-04 16:12 ` [PATCH 08/12] task_isolation: don't interrupt CPUs with tick_nohz_full_kick_cpu() Alex Belits 2020-03-06 16:03 ` Frederic Weisbecker 2020-03-08 7:28 ` [EXT] " Alex Belits 2020-03-09 2:38 ` Frederic Weisbecker 2020-03-04 16:13 ` [PATCH 09/12] task_isolation: net: don't flush backlog on CPUs running isolated tasks Alex Belits 2020-03-04 16:14 ` [PATCH 10/12] task_isolation: ringbuffer: don't interrupt CPUs running isolated tasks on buffer resize Alex Belits 2020-03-04 16:15 ` [PATCH 11/12] task_isolation: kick_all_cpus_sync: don't kick isolated cpus Alex Belits 2020-03-06 15:34 ` Frederic Weisbecker 2020-03-08 6:48 ` [EXT] " Alex Belits 2020-03-09 2:28 ` Frederic Weisbecker 2020-03-04 16:16 ` [PATCH 12/12] task_isolation: CONFIG_TASK_ISOLATION prevents distribution of jobs to non-housekeeping CPUs Alex Belits 2020-03-08 3:42 ` [PATCH v2 00/12] "Task_isolation" mode Alex Belits 2020-03-08 3:44 ` [PATCH v2 01/12] task_isolation: vmstat: add quiet_vmstat_sync function Alex Belits 2020-03-08 3:46 ` [PATCH v2 02/12] task_isolation: vmstat: add vmstat_idle function Alex Belits 2020-03-08 3:47 ` [PATCH v2 03/12] task_isolation: userspace hard isolation from kernel Alex Belits [not found] ` <20200307214254.7a8f6c22@hermes.lan> 2020-03-08 7:33 ` [EXT] " Alex Belits 2020-03-27 8:42 ` Marta Rybczynska 2020-04-06 4:31 ` Kevyn-Alexandre Paré 2020-04-06 4:43 ` Kevyn-Alexandre Paré 2020-03-08 3:48 ` [PATCH v2 04/12] task_isolation: Add task isolation hooks to arch-independent code Alex Belits 2020-03-08 3:49 ` [PATCH v2 05/12] task_isolation: arch/x86: enable task isolation functionality Alex Belits 2020-03-08 3:50 ` [PATCH v2 06/12] task_isolation: arch/arm64: " Alex Belits 2020-03-09 16:59 ` Mark Rutland 2020-03-08 3:52 ` [PATCH v2 07/12] task_isolation: arch/arm: " Alex Belits 2020-03-08 3:53 ` [PATCH v2 08/12] task_isolation: don't interrupt CPUs with tick_nohz_full_kick_cpu() Alex Belits 2020-03-08 3:54 ` [PATCH v2 09/12] task_isolation: net: don't flush backlog on CPUs running isolated tasks Alex Belits 2020-03-08 3:55 ` [PATCH v2 10/12] task_isolation: ringbuffer: don't interrupt CPUs running isolated tasks on buffer resize Alex Belits 2020-04-06 4:27 ` Kevyn-Alexandre Paré 2020-03-08 3:56 ` [PATCH v2 11/12] task_isolation: kick_all_cpus_sync: don't kick isolated cpus Alex Belits 2020-03-08 3:57 ` [PATCH v2 12/12] task_isolation: CONFIG_TASK_ISOLATION prevents distribution of jobs to non-housekeeping CPUs Alex Belits 2020-04-09 15:09 ` [PATCH v3 00/13] "Task_isolation" mode Alex Belits 2020-04-09 15:15 ` [PATCH 01/13] task_isolation: vmstat: add quiet_vmstat_sync function Alex Belits 2020-04-09 15:16 ` [PATCH 02/13] task_isolation: vmstat: add vmstat_idle function Alex Belits 2020-04-09 15:17 ` [PATCH v3 03/13] task_isolation: add instruction synchronization memory barrier Alex Belits 2020-04-15 12:44 ` Mark Rutland 2020-04-19 5:02 ` [EXT] " Alex Belits 2020-04-20 12:23 ` Will Deacon 2020-04-20 12:36 ` Mark Rutland 2020-04-20 13:55 ` Will Deacon 2020-04-21 7:41 ` Will Deacon 2020-04-20 12:45 ` Mark Rutland 2020-04-09 15:20 ` [PATCH v3 04/13] task_isolation: userspace hard isolation from kernel Alex Belits 2020-04-09 18:00 ` Andy Lutomirski 2020-04-19 5:07 ` Alex Belits 2020-04-09 15:21 ` [PATCH 05/13] task_isolation: Add task isolation hooks to arch-independent code Alex Belits 2020-04-09 15:22 ` [PATCH 06/13] task_isolation: arch/x86: enable task isolation functionality Alex Belits 2020-04-09 15:23 ` [PATCH v3 07/13] task_isolation: arch/arm64: " Alex Belits 2020-04-22 12:08 ` Catalin Marinas 2020-04-09 15:24 ` [PATCH v3 08/13] task_isolation: arch/arm: " Alex Belits 2020-04-09 15:25 ` Alex Belits [this message] 2020-04-09 15:26 ` [PATCH v3 10/13] task_isolation: net: don't flush backlog on CPUs running isolated tasks Alex Belits 2020-04-09 15:27 ` [PATCH v3 11/13] task_isolation: ringbuffer: don't interrupt CPUs running isolated tasks on buffer resize Alex Belits 2020-04-09 15:27 ` [PATCH v3 12/13] task_isolation: kick_all_cpus_sync: don't kick isolated cpus Alex Belits 2020-04-09 15:28 ` [PATCH v3 13/13] task_isolation: CONFIG_TASK_ISOLATION prevents distribution of jobs to non-housekeeping CPUs Alex Belits
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