From: Alexandre Chartre <alexandre.chartre@oracle.com>
To: Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>
Cc: x86@kernel.org, "Paul E. McKenney" <paulmck@kernel.org>,
Andy Lutomirski <luto@kernel.org>,
Frederic Weisbecker <frederic@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Petr Mladek <pmladek@suse.com>,
Steven Rostedt <rostedt@goodmis.org>,
Joel Fernandes <joel@joelfernandes.org>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>, Brian Gerst <brgerst@gmail.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Will Deacon <will@kernel.org>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>
Subject: Re: [patch V4 part 1 03/36] sched: Clean up scheduler_ipi()
Date: Wed, 6 May 2020 14:37:19 +0200 [thread overview]
Message-ID: <f969427d-a151-2c69-a779-a2b602e39d9e@oracle.com> (raw)
In-Reply-To: <20200505134058.361859938@linutronix.de>
On 5/5/20 3:16 PM, Thomas Gleixner wrote:
> The scheduler IPI has grown weird and wonderful over the years, time
> for spring cleaning.
>
> Move all the non-trivial stuff out of it and into a regular smp function
> call IPI. This then reduces the schedule_ipi() to most of it's former MOP
> glory and ensures to keep the interrupt vector lean and mean.
>
> Aside of that avoiding the full irq_enter() in the x86 IPI implementation
> is incorrect as scheduler_ipi() can be instrumented. To work around that
> scheduler_ipi() had an irq_enter/exit() hack when heavy work was
> pending. This is gone now.
>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> ---
> kernel/sched/core.c | 64 +++++++++++++++++++++++----------------------------
> kernel/sched/fair.c | 5 +--
> kernel/sched/sched.h | 6 +++-
> 3 files changed, 36 insertions(+), 39 deletions(-)
>
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -219,6 +219,13 @@ void update_rq_clock(struct rq *rq)
> update_rq_clock_task(rq, delta);
> }
>
> +static inline void
> +rq_csd_init(struct rq *rq, call_single_data_t *csd, smp_call_func_t func)
> +{
> + csd->flags = 0;
> + csd->func = func;
> + csd->info = rq;
> +}
>
> #ifdef CONFIG_SCHED_HRTICK
> /*
> @@ -314,16 +321,14 @@ void hrtick_start(struct rq *rq, u64 del
> hrtimer_start(&rq->hrtick_timer, ns_to_ktime(delay),
> HRTIMER_MODE_REL_PINNED_HARD);
> }
> +
> #endif /* CONFIG_SMP */
>
> static void hrtick_rq_init(struct rq *rq)
> {
> #ifdef CONFIG_SMP
> - rq->hrtick_csd.flags = 0;
> - rq->hrtick_csd.func = __hrtick_start;
> - rq->hrtick_csd.info = rq;
> + rq_csd_init(rq, &rq->hrtick_csd, __hrtick_start);
> #endif
> -
> hrtimer_init(&rq->hrtick_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_HARD);
> rq->hrtick_timer.function = hrtick;
> }
> @@ -650,6 +655,16 @@ static inline bool got_nohz_idle_kick(vo
> return false;
> }
>
> +static void nohz_csd_func(void *info)
> +{
> + struct rq *rq = info;
> +
> + if (got_nohz_idle_kick()) {
> + rq->idle_balance = 1;
> + raise_softirq_irqoff(SCHED_SOFTIRQ);
> + }
> +}
> +
> #else /* CONFIG_NO_HZ_COMMON */
>
> static inline bool got_nohz_idle_kick(void)
> @@ -2292,6 +2307,11 @@ void sched_ttwu_pending(void)
> rq_unlock_irqrestore(rq, &rf);
> }
>
> +static void wake_csd_func(void *info)
> +{
> + sched_ttwu_pending();
> +}
> +
> void scheduler_ipi(void)
> {
> /*
> @@ -2300,34 +2320,6 @@ void scheduler_ipi(void)
> * this IPI.
> */
> preempt_fold_need_resched();
> -
> - if (llist_empty(&this_rq()->wake_list) && !got_nohz_idle_kick())
> - return;
> -
> - /*
> - * Not all reschedule IPI handlers call irq_enter/irq_exit, since
> - * traditionally all their work was done from the interrupt return
> - * path. Now that we actually do some work, we need to make sure
> - * we do call them.
> - *
> - * Some archs already do call them, luckily irq_enter/exit nest
> - * properly.
> - *
> - * Arguably we should visit all archs and update all handlers,
> - * however a fair share of IPIs are still resched only so this would
> - * somewhat pessimize the simple resched case.
> - */
> - irq_enter();
> - sched_ttwu_pending();
> -
> - /*
> - * Check if someone kicked us for doing the nohz idle load balance.
> - */
> - if (unlikely(got_nohz_idle_kick())) {
> - this_rq()->idle_balance = 1;
> - raise_softirq_irqoff(SCHED_SOFTIRQ);
> - }
> - irq_exit();
> }
>
> static void ttwu_queue_remote(struct task_struct *p, int cpu, int wake_flags)
> @@ -2336,9 +2328,9 @@ static void ttwu_queue_remote(struct tas
>
> p->sched_remote_wakeup = !!(wake_flags & WF_MIGRATED);
>
> - if (llist_add(&p->wake_entry, &cpu_rq(cpu)->wake_list)) {
> + if (llist_add(&p->wake_entry, &rq->wake_list)) {
> if (!set_nr_if_polling(rq->idle))
> - smp_send_reschedule(cpu);
> + smp_call_function_single_async(cpu, &rq->wake_csd);
> else
> trace_sched_wake_idle_without_ipi(cpu);
> }
> @@ -6685,12 +6677,16 @@ void __init sched_init(void)
> rq->avg_idle = 2*sysctl_sched_migration_cost;
> rq->max_idle_balance_cost = sysctl_sched_migration_cost;
>
> + rq_csd_init(rq, &rq->wake_csd, wake_csd_func);
> +
> INIT_LIST_HEAD(&rq->cfs_tasks);
>
> rq_attach_root(rq, &def_root_domain);
> #ifdef CONFIG_NO_HZ_COMMON
> rq->last_blocked_load_update_tick = jiffies;
> atomic_set(&rq->nohz_flags, 0);
> +
> + rq_csd_init(rq, &rq->nohz_csd, nohz_csd_func);
> #endif
> #endif /* CONFIG_SMP */
> hrtick_rq_init(rq);
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -10009,12 +10009,11 @@ static void kick_ilb(unsigned int flags)
> return;
>
> /*
> - * Use smp_send_reschedule() instead of resched_cpu().
> - * This way we generate a sched IPI on the target CPU which
> + * This way we generate an IPI on the target CPU which
> * is idle. And the softirq performing nohz idle load balance
> * will be run before returning from the IPI.
> */
> - smp_send_reschedule(ilb_cpu);
> + smp_call_function_single_async(ilb_cpu, &cpu_rq(ilb_cpu)->wake_csd);
This should be nohz_csd instead of wake_csd, no? I.e.:
smp_call_function_single_async(ilb_cpu, &cpu_rq(ilb_cpu)->nohz_csd);
With that:
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
alex.
> }
>
> /*
> --- a/kernel/sched/sched.h
> +++ b/kernel/sched/sched.h
> @@ -890,9 +890,10 @@ struct rq {
> #ifdef CONFIG_SMP
> unsigned long last_blocked_load_update_tick;
> unsigned int has_blocked_load;
> + call_single_data_t nohz_csd;
> #endif /* CONFIG_SMP */
> unsigned int nohz_tick_stopped;
> - atomic_t nohz_flags;
> + atomic_t nohz_flags;
> #endif /* CONFIG_NO_HZ_COMMON */
>
> unsigned long nr_load_updates;
> @@ -979,7 +980,7 @@ struct rq {
>
> /* This is used to determine avg_idle's max value */
> u64 max_idle_balance_cost;
> -#endif
> +#endif /* CONFIG_SMP */
>
> #ifdef CONFIG_IRQ_TIME_ACCOUNTING
> u64 prev_irq_time;
> @@ -1021,6 +1022,7 @@ struct rq {
> #endif
>
> #ifdef CONFIG_SMP
> + call_single_data_t wake_csd;
> struct llist_head wake_list;
> #endif
>
>
next prev parent reply other threads:[~2020-05-06 12:39 UTC|newest]
Thread overview: 178+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-05 13:16 [patch V4 part 1 00/36] x86/entry: Entry/exception code rework, preparatory patches Thomas Gleixner
2020-05-05 13:16 ` [patch V4 part 1 01/36] rcu: Add comments marking transitions between RCU watching and not Thomas Gleixner
2020-05-05 13:16 ` [patch V4 part 1 02/36] x86/hw_breakpoint: Prevent data breakpoints on cpu_entry_area Thomas Gleixner
2020-05-06 8:14 ` Borislav Petkov
2020-05-06 12:11 ` Alexandre Chartre
2020-05-09 9:00 ` Lai Jiangshan
2020-05-09 9:23 ` Lai Jiangshan
2020-05-09 19:08 ` Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Andy Lutomirski
2020-05-05 13:16 ` [patch V4 part 1 03/36] sched: Clean up scheduler_ipi() Thomas Gleixner
2020-05-06 8:32 ` Thomas Gleixner
2020-05-06 8:40 ` Borislav Petkov
2020-05-06 9:12 ` Thomas Gleixner
2020-05-06 10:02 ` Borislav Petkov
2020-05-06 12:37 ` Alexandre Chartre [this message]
2020-05-06 15:03 ` Thomas Gleixner
2020-05-06 15:33 ` Peter Zijlstra
2020-05-06 18:28 ` Paul E. McKenney
2020-05-06 18:37 ` Peter Zijlstra
2020-05-06 18:46 ` Paul E. McKenney
2020-05-12 15:13 ` [tip: sched/core] " tip-bot2 for Peter Zijlstra (Intel)
2020-05-05 13:16 ` [patch V4 part 1 04/36] sched: Make scheduler_ipi inline Thomas Gleixner
2020-05-06 12:42 ` Alexandre Chartre
2020-05-12 15:13 ` [tip: sched/core] " tip-bot2 for Thomas Gleixner
2020-05-05 13:16 ` [patch V4 part 1 05/36] x86/entry: Flip _TIF_SIGPENDING and _TIF_NOTIFY_RESUME handling Thomas Gleixner
2020-05-06 11:53 ` Miroslav Benes
2020-05-06 12:06 ` Thomas Gleixner
2020-05-06 15:35 ` Peter Zijlstra
2020-05-06 13:06 ` Alexandre Chartre
2020-05-06 16:26 ` Borislav Petkov
2020-05-07 17:35 ` Andy Lutomirski
2020-05-13 20:56 ` Mathieu Desnoyers
2020-05-13 21:10 ` Steven Rostedt
2020-05-13 22:48 ` Mathieu Desnoyers
2020-05-14 0:12 ` Thomas Gleixner
2020-05-14 0:37 ` Steven Rostedt
2020-05-14 0:49 ` Thomas Gleixner
2020-05-14 1:22 ` Andy Lutomirski
2020-05-14 2:51 ` Mathieu Desnoyers
2020-05-14 9:19 ` Peter Zijlstra
2020-05-05 13:16 ` [patch V4 part 1 06/36] compiler: Simple READ/WRITE_ONCE() implementations Thomas Gleixner
2020-05-06 13:11 ` Alexandre Chartre
2020-05-06 13:33 ` Will Deacon
2020-05-06 15:36 ` Peter Zijlstra
2020-05-06 16:33 ` Borislav Petkov
2020-05-05 13:16 ` [patch V4 part 1 07/36] locking/atomics: Flip fallbacks and instrumentation Thomas Gleixner
2020-05-05 16:04 ` Mark Rutland
2020-05-07 23:41 ` Steven Rostedt
2020-05-08 8:40 ` Peter Zijlstra
2020-05-12 14:36 ` [tip: locking/kcsan] " tip-bot2 for Peter Zijlstra
2020-05-05 13:16 ` [patch V4 part 1 08/36] x86/doublefault: Remove memmove() call Thomas Gleixner
2020-05-06 13:47 ` Alexandre Chartre
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Peter Zijlstra
2020-05-05 13:16 ` [patch V4 part 1 09/36] x86/entry/64: Avoid pointless code when CONTEXT_TRACKING=n Thomas Gleixner
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:16 ` [patch V4 part 1 10/36] x86/entry: Remove the unused LOCKDEP_SYSEXIT cruft Thomas Gleixner
2020-05-06 13:52 ` Alexandre Chartre
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:16 ` [patch V4 part 1 11/36] x86/kvm: Handle async page faults directly through do_page_fault() Thomas Gleixner
2020-05-06 7:00 ` Paolo Bonzini
2020-05-06 14:05 ` Alexandre Chartre
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Andy Lutomirski
2020-05-05 13:16 ` [patch V4 part 1 12/36] x86/kvm: Sanitize kvm_async_pf_task_wait() Thomas Gleixner
2020-05-05 17:54 ` Paul E. McKenney
2020-05-05 21:50 ` Thomas Gleixner
2020-05-06 7:00 ` Paolo Bonzini
2020-05-06 12:53 ` Steven Rostedt
2020-05-06 15:13 ` Alexandre Chartre
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:16 ` [patch V4 part 1 13/36] x86/kvm: Restrict ASYNC_PF to user space Thomas Gleixner
2020-05-06 7:00 ` Paolo Bonzini
2020-05-06 15:29 ` Alexandre Chartre
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:16 ` [patch V4 part 1 14/36] x86/entry: Get rid of ist_begin/end_non_atomic() Thomas Gleixner
2020-05-06 15:34 ` Alexandre Chartre
2020-05-07 17:46 ` Andy Lutomirski
2020-05-13 22:57 ` Mathieu Desnoyers
2020-05-14 0:13 ` Steven Rostedt
2020-05-15 9:34 ` Thomas Gleixner
2020-05-15 13:11 ` Mathieu Desnoyers
2020-05-19 19:52 ` [tip: core/rcu] " tip-bot2 for Thomas Gleixner
2020-05-05 13:16 ` [patch V4 part 1 15/36] kprobes: Lock kprobe_mutex while showing kprobe_blacklist Thomas Gleixner
2020-05-06 15:38 ` Alexandre Chartre
2020-05-12 15:18 ` [tip: core/kprobes] " tip-bot2 for Masami Hiramatsu
2020-05-05 13:16 ` [patch V4 part 1 16/36] kprobes: Support __kprobes blacklist in modules Thomas Gleixner
2020-05-06 15:47 ` Alexandre Chartre
2020-05-12 15:18 ` [tip: core/kprobes] " tip-bot2 for Masami Hiramatsu
2020-05-05 13:16 ` [patch V4 part 1 17/36] kprobes: Support NOKPROBE_SYMBOL() " Thomas Gleixner
2020-05-06 15:54 ` Alexandre Chartre
2020-05-12 15:18 ` [tip: core/kprobes] " tip-bot2 for Masami Hiramatsu
2020-05-05 13:16 ` [patch V4 part 1 18/36] samples/kprobes: Add __kprobes and NOKPROBE_SYMBOL() for handlers Thomas Gleixner
2020-05-06 15:57 ` Alexandre Chartre
2020-05-12 15:18 ` [tip: core/kprobes] " tip-bot2 for Masami Hiramatsu
2020-05-05 13:16 ` [patch V4 part 1 19/36] x86/entry: Exclude low level entry code from sanitizing Thomas Gleixner
2020-05-05 20:39 ` Brian Gerst
2020-05-06 15:42 ` Peter Zijlstra
2020-05-06 16:03 ` Alexandre Chartre
2020-05-13 22:58 ` Mathieu Desnoyers
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Peter Zijlstra
2020-05-05 13:16 ` [patch V4 part 1 20/36] vmlinux.lds.h: Create section for protection against instrumentation Thomas Gleixner
2020-05-06 16:08 ` Sean Christopherson
2020-05-06 16:28 ` Peter Zijlstra
2020-05-06 16:57 ` Thomas Gleixner
2020-05-19 19:52 ` [tip: core/rcu] " tip-bot2 for Thomas Gleixner
2020-05-05 13:16 ` [patch V4 part 1 21/36] kprobes: Prevent probes in .noinstr.text section Thomas Gleixner
2020-05-08 6:30 ` Masami Hiramatsu
2020-05-19 19:52 ` [tip: core/kprobes] " tip-bot2 for Thomas Gleixner
2020-05-05 13:16 ` [patch V4 part 1 22/36] tracing: Provide lockdep less trace_hardirqs_on/off() variants Thomas Gleixner
2020-05-07 17:55 ` Andy Lutomirski
2020-05-07 18:52 ` Thomas Gleixner
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:16 ` [patch V4 part 1 23/36] bug: Annotate WARN/BUG/stackfail as noinstr safe Thomas Gleixner
2020-05-13 23:12 ` Mathieu Desnoyers
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:16 ` [patch V4 part 1 24/36] lockdep: Prepare for noinstr sections Thomas Gleixner
2020-05-08 0:23 ` Steven Rostedt
2020-05-08 8:44 ` Peter Zijlstra
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Peter Zijlstra
2020-05-05 13:16 ` [patch V4 part 1 25/36] rcu/tree: Mark the idle relevant functions noinstr Thomas Gleixner
2020-05-05 18:07 ` Paul E. McKenney
2020-05-19 19:48 ` Joel Fernandes
2020-05-19 19:52 ` [tip: core/rcu] " tip-bot2 for Thomas Gleixner
2020-09-28 22:22 ` Kim Phillips
2020-09-28 22:55 ` Paul E. McKenney
2020-09-29 7:25 ` Peter Zijlstra
2020-09-29 11:25 ` Peter Zijlstra
2020-09-29 14:34 ` Steven Rostedt
2020-09-29 14:52 ` Peter Zijlstra
2020-05-05 13:16 ` [patch V4 part 1 26/36] printk: Prepare for nested printk_nmi_enter() Thomas Gleixner
2020-05-19 19:52 ` [tip: core/rcu] " tip-bot2 for Petr Mladek
2020-05-05 13:16 ` [patch V4 part 1 27/36] arm64: Prepare arch_nmi_enter() for recursion Thomas Gleixner
2020-05-13 23:28 ` Mathieu Desnoyers
2020-05-15 14:04 ` Frederic Weisbecker
2020-05-15 15:45 ` Will Deacon
2020-05-15 16:01 ` Mathieu Desnoyers
2020-05-15 21:29 ` Thomas Gleixner
2020-05-15 21:31 ` Frederic Weisbecker
2020-05-19 19:52 ` [tip: core/rcu] " tip-bot2 for Frederic Weisbecker
2020-05-05 13:16 ` [patch V4 part 1 28/36] hardirq/nmi: Allow nested nmi_enter() Thomas Gleixner
2020-05-19 19:52 ` [tip: core/rcu] " tip-bot2 for Peter Zijlstra
2020-05-05 13:16 ` [patch V4 part 1 29/36] x86/mce: Send #MC singal from task work Thomas Gleixner
2020-05-07 18:02 ` Andy Lutomirski
2020-05-08 8:48 ` Peter Zijlstra
2020-05-08 21:30 ` Andy Lutomirski
2020-05-14 14:16 ` Borislav Petkov
2020-05-13 23:42 ` Mathieu Desnoyers
2020-05-14 17:38 ` Thomas Gleixner
2020-05-14 17:42 ` Mathieu Desnoyers
2020-05-14 14:17 ` Borislav Petkov
2020-05-14 16:03 ` Mathieu Desnoyers
2020-05-14 16:19 ` Andy Lutomirski
2020-05-14 16:39 ` Borislav Petkov
2020-05-14 17:05 ` Mathieu Desnoyers
2020-05-19 19:52 ` [tip: core/rcu] " tip-bot2 for Peter Zijlstra
2020-05-05 13:16 ` [patch V4 part 1 30/36] lockdep: Always inline lockdep_{off,on}() Thomas Gleixner
2020-05-13 23:46 ` Mathieu Desnoyers
2020-05-19 19:52 ` [tip: core/rcu] " tip-bot2 for Peter Zijlstra
2020-05-05 13:16 ` [patch V4 part 1 31/36] printk: Disallow instrumenting print_nmi_enter() Thomas Gleixner
2020-05-19 19:52 ` [tip: core/rcu] " tip-bot2 for Peter Zijlstra
2020-05-05 13:16 ` [patch V4 part 1 32/36] sh/ftrace: Move arch_ftrace_nmi_{enter,exit} into nmi exception Thomas Gleixner
2020-05-08 0:34 ` Steven Rostedt
2020-05-19 19:52 ` [tip: core/rcu] " tip-bot2 for Peter Zijlstra
2020-05-05 13:16 ` [patch V4 part 1 33/36] x86,tracing: Robustify ftrace_nmi_enter() Thomas Gleixner
2020-05-08 6:19 ` Masami Hiramatsu
2020-05-05 13:16 ` [patch V4 part 1 34/36] sched,rcu,tracing: Avoid tracing before in_nmi() is correct Thomas Gleixner
2020-05-19 19:52 ` [tip: core/rcu] " tip-bot2 for Peter Zijlstra
2020-05-05 13:16 ` [patch V4 part 1 35/36] x86: Replace ist_enter() with nmi_enter() Thomas Gleixner
2020-05-07 18:04 ` Andy Lutomirski
2020-05-07 18:17 ` Mathieu Desnoyers
2020-05-08 8:50 ` Peter Zijlstra
2020-05-08 17:12 ` Josh Poimboeuf
2020-05-14 0:12 ` Mathieu Desnoyers
2020-05-19 19:52 ` [tip: core/rcu] " tip-bot2 for Peter Zijlstra
2020-05-05 13:16 ` [patch V4 part 1 36/36] rcu: Make RCU IRQ enter/exit functions rely on in_nmi() Thomas Gleixner
2020-05-05 18:13 ` Paul E. McKenney
2020-05-06 17:09 ` Alexandre Chartre
2020-05-19 19:52 ` [tip: core/rcu] " tip-bot2 for Paul E. McKenney
2020-05-07 18:05 ` [patch V4 part 1 00/36] x86/entry: Entry/exception code rework, preparatory patches Andy Lutomirski
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