From: Jing-Ting Wu <jing-ting.wu@mediatek.com> To: Peter Zijlstra <peterz@infradead.org> Cc: Daniel Bristot de Oliveira <bristot@redhat.com>, Valentin Schneider <vschneid@redhat.com>, <tglx@linutronix.de>, <wsd_upstream@mediatek.com>, <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-mediatek@lists.infradead.org>, <Jonathan.JMChen@mediatek.com>, "chris.redpath@arm.com" <chris.redpath@arm.com>, Dietmar Eggemann <dietmar.eggemann@arm.com>, Vincent Donnefort <vdonnefort@gmail.com>, "Ingo Molnar" <mingo@redhat.com>, Juri Lelli <juri.lelli@redhat.com>, "Vincent Guittot" <vincent.guittot@linaro.org>, Steven Rostedt <rostedt@goodmis.org>, Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>, "Christian Brauner" <brauner@kernel.org> Subject: Re: [SPAM]Re: [Bug] Race condition between CPU hotplug off flow and __sched_setscheduler() Date: Fri, 3 Jun 2022 00:15:51 +0800 [thread overview] Message-ID: <78f3347e01a5c46975b9029f93deea2b31bb8393.camel@mediatek.com> (raw) In-Reply-To: <ba7ddde1829ee9eedcd6673f923d731d60719dc5.camel@mediatek.com> Hi Peter > > > How easy can you reproduce; does the below hack make it better? The patch is helpful to the syndrome, passed stability test over 10 days so far. (as-is: < 48 hours failed) Could you help to upstream this patch to linux kernel mainline? Thank you. > > > > diff --git a/kernel/sched/core.c b/kernel/sched/core.c > > > index 95bac3b094b3..f18ee22b29bc 100644 > > > --- a/kernel/sched/core.c > > > +++ b/kernel/sched/core.c > > > @@ -4763,20 +4763,30 @@ struct callback_head > > > balance_push_callback > > > = > > > { > > > .func = (void (*)(struct callback_head *))balance_push, > > > }; > > > > > > -static inline struct callback_head > > > *splice_balance_callbacks(struct > > > rq *rq) > > > +static inline struct callback_head * > > > +__splice_balance_callbacks(struct rq *rq, bool foo) > > > { > > > struct callback_head *head = rq->balance_callback; > > > > > > lockdep_assert_rq_held(rq); > > > - if (head) > > > - rq->balance_callback = NULL; > > > + if (head) { > > > + if (foo && head == &balance_push_callback) > > > + head = NULL; > > > + else > > > + rq->balance_callback = NULL; > > > + } > > > > > > return head; > > > } > > > > > > +static inline struct callback_head > > > *splice_balance_callbacks(struct > > > rq *rq) > > > +{ > > > + return __splice_balance_callbacks(rq, true); > > > +} > > > + > > > static void __balance_callbacks(struct rq *rq) > > > { > > > - do_balance_callbacks(rq, splice_balance_callbacks(rq)); > > > + do_balance_callbacks(rq, __splice_balance_callbacks(rq, > > > false)); > > > } > > > > > > static inline void balance_callbacks(struct rq *rq, struct > > > callback_head *head) > > > Best Regards, Jing-Ting Wu > > _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek
WARNING: multiple messages have this Message-ID (diff)
From: Jing-Ting Wu <jing-ting.wu@mediatek.com> To: Peter Zijlstra <peterz@infradead.org> Cc: Daniel Bristot de Oliveira <bristot@redhat.com>, Valentin Schneider <vschneid@redhat.com>, <tglx@linutronix.de>, <wsd_upstream@mediatek.com>, <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-mediatek@lists.infradead.org>, <Jonathan.JMChen@mediatek.com>, "chris.redpath@arm.com" <chris.redpath@arm.com>, Dietmar Eggemann <dietmar.eggemann@arm.com>, Vincent Donnefort <vdonnefort@gmail.com>, "Ingo Molnar" <mingo@redhat.com>, Juri Lelli <juri.lelli@redhat.com>, "Vincent Guittot" <vincent.guittot@linaro.org>, Steven Rostedt <rostedt@goodmis.org>, Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>, "Christian Brauner" <brauner@kernel.org> Subject: Re: [SPAM]Re: [Bug] Race condition between CPU hotplug off flow and __sched_setscheduler() Date: Fri, 3 Jun 2022 00:15:51 +0800 [thread overview] Message-ID: <78f3347e01a5c46975b9029f93deea2b31bb8393.camel@mediatek.com> (raw) In-Reply-To: <ba7ddde1829ee9eedcd6673f923d731d60719dc5.camel@mediatek.com> Hi Peter > > > How easy can you reproduce; does the below hack make it better? The patch is helpful to the syndrome, passed stability test over 10 days so far. (as-is: < 48 hours failed) Could you help to upstream this patch to linux kernel mainline? Thank you. > > > > diff --git a/kernel/sched/core.c b/kernel/sched/core.c > > > index 95bac3b094b3..f18ee22b29bc 100644 > > > --- a/kernel/sched/core.c > > > +++ b/kernel/sched/core.c > > > @@ -4763,20 +4763,30 @@ struct callback_head > > > balance_push_callback > > > = > > > { > > > .func = (void (*)(struct callback_head *))balance_push, > > > }; > > > > > > -static inline struct callback_head > > > *splice_balance_callbacks(struct > > > rq *rq) > > > +static inline struct callback_head * > > > +__splice_balance_callbacks(struct rq *rq, bool foo) > > > { > > > struct callback_head *head = rq->balance_callback; > > > > > > lockdep_assert_rq_held(rq); > > > - if (head) > > > - rq->balance_callback = NULL; > > > + if (head) { > > > + if (foo && head == &balance_push_callback) > > > + head = NULL; > > > + else > > > + rq->balance_callback = NULL; > > > + } > > > > > > return head; > > > } > > > > > > +static inline struct callback_head > > > *splice_balance_callbacks(struct > > > rq *rq) > > > +{ > > > + return __splice_balance_callbacks(rq, true); > > > +} > > > + > > > static void __balance_callbacks(struct rq *rq) > > > { > > > - do_balance_callbacks(rq, splice_balance_callbacks(rq)); > > > + do_balance_callbacks(rq, __splice_balance_callbacks(rq, > > > false)); > > > } > > > > > > static inline void balance_callbacks(struct rq *rq, struct > > > callback_head *head) > > > Best Regards, Jing-Ting Wu > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-06-02 16:16 UTC|newest] Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-05-19 12:53 [Bug] Race condition between CPU hotplug off flow and __sched_setscheduler() Jing-Ting Wu 2022-05-19 12:53 ` Jing-Ting Wu 2022-05-19 12:53 ` Jing-Ting Wu 2022-05-19 13:14 ` Peter Zijlstra 2022-05-19 13:14 ` Peter Zijlstra 2022-05-19 13:14 ` Peter Zijlstra 2022-05-19 13:19 ` Peter Zijlstra 2022-05-19 13:19 ` Peter Zijlstra 2022-05-19 13:19 ` Peter Zijlstra 2022-05-19 13:47 ` Peter Zijlstra 2022-05-19 13:47 ` Peter Zijlstra 2022-05-19 13:47 ` Peter Zijlstra 2022-05-23 7:12 ` [SPAM]Re: " Jing-Ting Wu 2022-05-23 7:12 ` Jing-Ting Wu 2022-05-26 5:57 ` Jing-Ting Wu 2022-05-26 5:57 ` Jing-Ting Wu 2022-06-02 16:15 ` Jing-Ting Wu [this message] 2022-06-02 16:15 ` Jing-Ting Wu 2022-06-07 20:40 ` Peter Zijlstra 2022-06-07 20:40 ` Peter Zijlstra 2022-06-07 21:39 ` [PATCH] sched: Fix balance_push() vs __sched_setscheduler() Peter Zijlstra 2022-06-07 21:39 ` Peter Zijlstra 2022-06-07 21:39 ` Peter Zijlstra 2022-06-08 14:16 ` Jing-Ting Wu 2022-06-08 14:16 ` Jing-Ting Wu 2022-06-08 14:16 ` Jing-Ting Wu 2022-06-08 14:48 ` Peter Zijlstra 2022-06-08 14:48 ` Peter Zijlstra 2022-06-08 14:48 ` Peter Zijlstra 2022-06-13 8:29 ` [tip: sched/urgent] " tip-bot2 for Peter Zijlstra
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