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Tue, 7 Nov 2023 21:59:43 +0000 From: Ankur Arora To: linux-kernel@vger.kernel.org Cc: tglx@linutronix.de, peterz@infradead.org, torvalds@linux-foundation.org, paulmck@kernel.org, linux-mm@kvack.org, x86@kernel.org, akpm@linux-foundation.org, luto@kernel.org, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, willy@infradead.org, mgorman@suse.de, jon.grimm@amd.com, bharata@amd.com, raghavendra.kt@amd.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com, jgross@suse.com, andrew.cooper3@citrix.com, mingo@kernel.org, bristot@kernel.org, mathieu.desnoyers@efficios.com, geert@linux-m68k.org, glaubitz@physik.fu-berlin.de, anton.ivanov@cambridgegreys.com, mattst88@gmail.com, krypton@ulrich-teichert.org, rostedt@goodmis.org, David.Laight@ACULAB.COM, richard@nod.at, mjguzik@gmail.com, Ankur Arora Subject: [RFC PATCH 39/86] sched: handle lazy resched in set_nr_*_polling() Date: Tue, 7 Nov 2023 13:57:25 -0800 Message-Id: <20231107215742.363031-40-ankur.a.arora@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20231107215742.363031-1-ankur.a.arora@oracle.com> References: <20231107215742.363031-1-ankur.a.arora@oracle.com> X-ClientProxiedBy: MW4P221CA0015.NAMP221.PROD.OUTLOOK.COM (2603:10b6:303:8b::20) To CO6PR10MB5409.namprd10.prod.outlook.com (2603:10b6:5:357::14) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO6PR10MB5409:EE_|CY5PR10MB6141:EE_ X-MS-Office365-Filtering-Correlation-Id: c09bc759-dae1-4d26-4eb9-08dbdfdcd929 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Tue, 07 Nov 2023 14:04:22 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1781944459043624302 X-GMAIL-MSGID: 1781944459043624302 To trigger a reschedule on a target runqueue a few things need to happen first: 1. set_tsk_need_resched(target_rq->curr, RESCHED_eager) 2. ensure that the target CPU sees the need-resched bit 3. preempt_fold_need_resched() Most of this is done via some combination of: resched_curr(), set_nr_if_polling(), and set_nr_and_not_polling(). Update the last two to also handle TIF_NEED_RESCHED_LAZY. One thing to note is that TIF_NEED_RESCHED_LAZY has run to completion semantics, so unlike TIF_NEED_RESCHED, we don't need to ensure that the caller sees it, and of course there is no preempt folding. Originally-by: Thomas Gleixner Signed-off-by: Ankur Arora --- kernel/sched/core.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index e2215c417323..01df5ac2982c 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -892,14 +892,15 @@ static inline void hrtick_rq_init(struct rq *rq) #if defined(CONFIG_SMP) && defined(TIF_POLLING_NRFLAG) /* - * Atomically set TIF_NEED_RESCHED and test for TIF_POLLING_NRFLAG, + * Atomically set TIF_NEED_RESCHED[_LAZY] and test for TIF_POLLING_NRFLAG, * this avoids any races wrt polling state changes and thereby avoids * spurious IPIs. */ -static inline bool set_nr_and_not_polling(struct task_struct *p) +static inline bool set_nr_and_not_polling(struct task_struct *p, resched_t rs) { struct thread_info *ti = task_thread_info(p); - return !(fetch_or(&ti->flags, _TIF_NEED_RESCHED) & _TIF_POLLING_NRFLAG); + + return !(fetch_or(&ti->flags, _tif_resched(rs)) & _TIF_POLLING_NRFLAG); } /* @@ -916,7 +917,7 @@ static bool set_nr_if_polling(struct task_struct *p) for (;;) { if (!(val & _TIF_POLLING_NRFLAG)) return false; - if (val & _TIF_NEED_RESCHED) + if (val & (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY)) return true; if (try_cmpxchg(&ti->flags, &val, val | _TIF_NEED_RESCHED)) break; @@ -925,9 +926,9 @@ static bool set_nr_if_polling(struct task_struct *p) } #else -static inline bool set_nr_and_not_polling(struct task_struct *p) +static inline bool set_nr_and_not_polling(struct task_struct *p, resched_t rs) { - set_tsk_need_resched(p, RESCHED_eager); + set_tsk_need_resched(p, rs); return true; } @@ -1050,7 +1051,7 @@ void resched_curr(struct rq *rq) return; } - if (set_nr_and_not_polling(curr)) + if (set_nr_and_not_polling(curr, RESCHED_eager)) smp_send_reschedule(cpu); else trace_sched_wake_idle_without_ipi(cpu); @@ -1126,7 +1127,7 @@ static void wake_up_idle_cpu(int cpu) if (cpu == smp_processor_id()) return; - if (set_nr_and_not_polling(rq->idle)) + if (set_nr_and_not_polling(rq->idle, RESCHED_eager)) smp_send_reschedule(cpu); else trace_sched_wake_idle_without_ipi(cpu);