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Groups > linux.kernel > #1446146
| From | tip-bot for Thomas Gleixner <tipbot@zytor.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [tip:smp/hotplug] workqueue: Convert to state machine callbacks |
| Date | 2016-07-19 09:20 +0200 |
| Message-ID | <rWxtV-129-47@gated-at.bofh.it> (permalink) |
| References | <rUw8X-67L-69@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Commit-ID: 7ee681b25284782ecf380bf5ccf55f13c52fd0ce
Gitweb: http://git.kernel.org/tip/7ee681b25284782ecf380bf5ccf55f13c52fd0ce
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Wed, 13 Jul 2016 17:16:29 +0000
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 14 Jul 2016 09:34:43 +0200
workqueue: Convert to state machine callbacks
Get rid of the prio ordering of the separate notifiers and use a proper state
callback pair.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153335.197083890@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
include/linux/cpu.h | 9 ----
include/linux/cpuhotplug.h | 2 +
include/linux/workqueue.h | 6 +++
kernel/cpu.c | 10 +++++
kernel/workqueue.c | 108 ++++++++++++++++++---------------------------
5 files changed, 61 insertions(+), 74 deletions(-)
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index ca2dd86..797d9c8 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -55,15 +55,6 @@ extern ssize_t arch_cpu_release(const char *, size_t);
#endif
struct notifier_block;
-/*
- * CPU notifier priorities.
- */
-enum {
- /* bring up workqueues before normal notifiers and down after */
- CPU_PRI_WORKQUEUE_UP = 5,
- CPU_PRI_WORKQUEUE_DOWN = -5,
-};
-
#define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */
#define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */
#define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index acfeda1..60557a9 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -12,6 +12,7 @@ enum cpuhp_state {
CPUHP_PERF_BFIN,
CPUHP_PERF_POWER,
CPUHP_PERF_SUPERH,
+ CPUHP_WORKQUEUE_PREP,
CPUHP_NOTIFY_PREPARE,
CPUHP_BRINGUP_CPU,
CPUHP_AP_IDLE_DEAD,
@@ -49,6 +50,7 @@ enum cpuhp_state {
CPUHP_AP_PERF_S390_SF_ONLINE,
CPUHP_AP_PERF_ARM_CCI_ONLINE,
CPUHP_AP_PERF_ARM_CCN_ONLINE,
+ CPUHP_AP_WORKQUEUE_ONLINE,
CPUHP_AP_NOTIFY_ONLINE,
CPUHP_AP_ONLINE_DYN,
CPUHP_AP_ONLINE_DYN_END = CPUHP_AP_ONLINE_DYN + 30,
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index ca73c50..26cc1df 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -625,4 +625,10 @@ void wq_watchdog_touch(int cpu);
static inline void wq_watchdog_touch(int cpu) { }
#endif /* CONFIG_WQ_WATCHDOG */
+#ifdef CONFIG_SMP
+int workqueue_prepare_cpu(unsigned int cpu);
+int workqueue_online_cpu(unsigned int cpu);
+int workqueue_offline_cpu(unsigned int cpu);
+#endif
+
#endif
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 3705d90..af53f82 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -1185,6 +1185,11 @@ static struct cpuhp_step cpuhp_bp_states[] = {
.startup = perf_event_init_cpu,
.teardown = perf_event_exit_cpu,
},
+ [CPUHP_WORKQUEUE_PREP] = {
+ .name = "workqueue prepare",
+ .startup = workqueue_prepare_cpu,
+ .teardown = NULL,
+ },
/*
* Preparatory and dead notifiers. Will be replaced once the notifiers
* are converted to states.
@@ -1267,6 +1272,11 @@ static struct cpuhp_step cpuhp_ap_states[] = {
.startup = perf_event_init_cpu,
.teardown = perf_event_exit_cpu,
},
+ [CPUHP_AP_WORKQUEUE_ONLINE] = {
+ .name = "workqueue online",
+ .startup = workqueue_online_cpu,
+ .teardown = workqueue_offline_cpu,
+ },
/*
* Online/down_prepare notifiers. Will be removed once the notifiers
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index e1c0e99..c9dd5fb 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4611,84 +4611,65 @@ static void restore_unbound_workers_cpumask(struct worker_pool *pool, int cpu)
pool->attrs->cpumask) < 0);
}
-/*
- * Workqueues should be brought up before normal priority CPU notifiers.
- * This will be registered high priority CPU notifier.
- */
-static int workqueue_cpu_up_callback(struct notifier_block *nfb,
- unsigned long action,
- void *hcpu)
+int workqueue_prepare_cpu(unsigned int cpu)
+{
+ struct worker_pool *pool;
+
+ for_each_cpu_worker_pool(pool, cpu) {
+ if (pool->nr_workers)
+ continue;
+ if (!create_worker(pool))
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+int workqueue_online_cpu(unsigned int cpu)
{
- int cpu = (unsigned long)hcpu;
struct worker_pool *pool;
struct workqueue_struct *wq;
int pi;
- switch (action & ~CPU_TASKS_FROZEN) {
- case CPU_UP_PREPARE:
- for_each_cpu_worker_pool(pool, cpu) {
- if (pool->nr_workers)
- continue;
- if (!create_worker(pool))
- return NOTIFY_BAD;
- }
- break;
-
- case CPU_DOWN_FAILED:
- case CPU_ONLINE:
- mutex_lock(&wq_pool_mutex);
+ mutex_lock(&wq_pool_mutex);
- for_each_pool(pool, pi) {
- mutex_lock(&pool->attach_mutex);
+ for_each_pool(pool, pi) {
+ mutex_lock(&pool->attach_mutex);
- if (pool->cpu == cpu)
- rebind_workers(pool);
- else if (pool->cpu < 0)
- restore_unbound_workers_cpumask(pool, cpu);
+ if (pool->cpu == cpu)
+ rebind_workers(pool);
+ else if (pool->cpu < 0)
+ restore_unbound_workers_cpumask(pool, cpu);
- mutex_unlock(&pool->attach_mutex);
- }
+ mutex_unlock(&pool->attach_mutex);
+ }
- /* update NUMA affinity of unbound workqueues */
- list_for_each_entry(wq, &workqueues, list)
- wq_update_unbound_numa(wq, cpu, true);
+ /* update NUMA affinity of unbound workqueues */
+ list_for_each_entry(wq, &workqueues, list)
+ wq_update_unbound_numa(wq, cpu, true);
- mutex_unlock(&wq_pool_mutex);
- break;
- }
- return NOTIFY_OK;
+ mutex_unlock(&wq_pool_mutex);
+ return 0;
}
-/*
- * Workqueues should be brought down after normal priority CPU notifiers.
- * This will be registered as low priority CPU notifier.
- */
-static int workqueue_cpu_down_callback(struct notifier_block *nfb,
- unsigned long action,
- void *hcpu)
+int workqueue_offline_cpu(unsigned int cpu)
{
- int cpu = (unsigned long)hcpu;
struct work_struct unbind_work;
struct workqueue_struct *wq;
- switch (action & ~CPU_TASKS_FROZEN) {
- case CPU_DOWN_PREPARE:
- /* unbinding per-cpu workers should happen on the local CPU */
- INIT_WORK_ONSTACK(&unbind_work, wq_unbind_fn);
- queue_work_on(cpu, system_highpri_wq, &unbind_work);
-
- /* update NUMA affinity of unbound workqueues */
- mutex_lock(&wq_pool_mutex);
- list_for_each_entry(wq, &workqueues, list)
- wq_update_unbound_numa(wq, cpu, false);
- mutex_unlock(&wq_pool_mutex);
-
- /* wait for per-cpu unbinding to finish */
- flush_work(&unbind_work);
- destroy_work_on_stack(&unbind_work);
- break;
- }
- return NOTIFY_OK;
+ /* unbinding per-cpu workers should happen on the local CPU */
+ INIT_WORK_ONSTACK(&unbind_work, wq_unbind_fn);
+ queue_work_on(cpu, system_highpri_wq, &unbind_work);
+
+ /* update NUMA affinity of unbound workqueues */
+ mutex_lock(&wq_pool_mutex);
+ list_for_each_entry(wq, &workqueues, list)
+ wq_update_unbound_numa(wq, cpu, false);
+ mutex_unlock(&wq_pool_mutex);
+
+ /* wait for per-cpu unbinding to finish */
+ flush_work(&unbind_work);
+ destroy_work_on_stack(&unbind_work);
+ return 0;
}
#ifdef CONFIG_SMP
@@ -5490,9 +5471,6 @@ static int __init init_workqueues(void)
pwq_cache = KMEM_CACHE(pool_workqueue, SLAB_PANIC);
- cpu_notifier(workqueue_cpu_up_callback, CPU_PRI_WORKQUEUE_UP);
- hotcpu_notifier(workqueue_cpu_down_callback, CPU_PRI_WORKQUEUE_DOWN);
-
wq_numa_init();
/* initialize CPU pools */
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[patch V2 32/67] x86/kvm/kvmclock: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
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[patch V2 07/67] irqchip/bcm2836: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
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[patch V2 18/67] powerpc/perf: Convert book3s notifier to state machine callbacks Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
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[patch V2 08/67] ARM: mvebu: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
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[patch V2 24/67] xtensa/perf: Convert the hotplug notifier to state machine callbacks Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
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[patch V2 11/67] perf/x86/intel/uncore: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
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[patch V2 23/67] bus/arm-ccn: Convert to hotplug statemachine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
Re: [patch V2 23/67] bus/arm-ccn: Convert to hotplug statemachine Pawel Moll <pawel.moll@arm.com> - 2016-07-18 20:40 +0200
[tip:smp/hotplug] bus/arm-ccn: Convert to hotplug statemachine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:20 +0200
[patch V2 25/67] perf/x86/amd/power: Change hotplug notifier to a symmetric structure Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] perf/x86/amd/power: Change hotplug notifier to a symmetric structure tip-bot for Anna-Maria Gleixner <tipbot@zytor.com> - 2016-07-19 09:20 +0200
[patch V2 20/67] s390/perf: Convert the hotplug notifier to state machine callbacks (Sampling) Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] s390/perf: Convert the hotplug notifier to state machine callbacks (Sampling) tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:10 +0200
[patch V2 33/67] x86/apb_timer: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] x86/apb_timer: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:20 +0200
[patch V2 61/67] rcu: Convert rcutree to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] rcu: Convert rcutree to hotplug state machine tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2016-07-19 09:40 +0200
[patch V2 31/67] KVM/x86: Remove superfluous SMP function call Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
Re: [patch V2 31/67] KVM/x86: Remove superfluous SMP function call Paolo Bonzini <pbonzini@redhat.com> - 2016-07-14 10:30 +0200
[tip:smp/hotplug] KVM/x86: Remove superfluous SMP function call tip-bot for Anna-Maria Gleixner <tipbot@zytor.com> - 2016-07-19 09:20 +0200
[patch V2 09/67] perf/core: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] perf/core: Convert to hotplug state machine tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2016-07-19 09:10 +0200
[patch V2 16/67] perf/x86/intel/cstate: Convert Intel CSTATE to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] perf/x86/intel/cstate: Convert Intel CSTATE to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:10 +0200
[patch V2 22/67] bus/arm-cci: Convert to hotplug statemachine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
Re: [patch V2 22/67] bus/arm-cci: Convert to hotplug statemachine Punit Agrawal <punit.agrawal@arm.com> - 2016-07-15 14:40 +0200
[tip:smp/hotplug] bus/arm-cci: Convert to hotplug statemachine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:10 +0200
[patch V2 34/67] arm: Convert VFP hotplug notifiers to state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] arm: Convert VFP hotplug notifiers to state machine tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2016-07-19 09:20 +0200
[patch V2 36/67] virt: Convert kvm hotplug to state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] virt: Convert kvm hotplug to state machine tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2016-07-19 09:20 +0200
[patch V2 37/67] ACPI/processor: Avoid STARTING/DYING actions in a more logical way Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] ACPI/processor: Avoid STARTING/DYING actions in a more logical way tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:20 +0200
[patch V2 41/67] clocksource/qcom-timer: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] clocksource/qcom-timer: Convert to hotplug state machine tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:30 +0200
[patch V2 52/67] hwtracing/coresight-etm4x: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] hwtracing/coresight-etm4x: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:30 +0200
[patch V2 38/67] clocksource/arm_arch_timer: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] clocksource/arm_arch_timer: Convert to hotplug state machine tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:20 +0200
[patch V2 45/67] arm/kvm/arch_timer: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] arm/kvm/arch_timer: Convert to hotplug state machine tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:30 +0200
[patch V2 30/67] powerpc/numa: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine Anton Blanchard <anton@samba.org> - 2016-07-14 23:50 +0200
Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-15 02:10 +0200
Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine Anton Blanchard <anton@samba.org> - 2016-07-15 02:30 +0200
Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine Ingo Molnar <mingo@kernel.org> - 2016-07-15 10:50 +0200
Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine Anton Blanchard <anton@samba.org> - 2016-07-15 14:20 +0200
Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-07-15 18:30 +0200
[PATCH v2] powerpc/numa: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-07-18 16:10 +0200
[tip:smp/hotplug] powerpc/numa: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-22 22:00 +0200
[patch V2 46/67] metag/perf: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] metag/perf: Convert to hotplug state machine tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:30 +0200
[patch V2 57/67] profile: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] profile: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:30 +0200
[patch V2 12/67] perf/x86/amd/uncore: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] perf/x86/amd/uncore: Convert to hotplug state machine tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:10 +0200
Re: [patch V2 00/67] cpuhotplug: Convert all priority notifiers to the state machine Jason Cooper <jason@lakedaemon.net> - 2016-07-13 21:40 +0200
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