From: Peter Zijlstra <peterz@infradead.org>
To: linux-kernel@vger.kernel.org, mingo@kernel.org, rjw@rjwysocki.net
Cc: tglx@linutronix.de, peterz@infradead.org
Subject: [PATCH 11/35] clockevents: Cleanup dead cpu explicitely
Date: Mon, 16 Feb 2015 13:14:46 +0100 [thread overview]
Message-ID: <20150216122412.618821882@infradead.org> (raw)
In-Reply-To: 20150216121435.203983131@infradead.org
[-- Attachment #1: clockevents-cleanup-dead-cpu-explicitely.patch --]
[-- Type: text/plain, Size: 11608 bytes --]
From: Thomas Gleixner <tglx@linutronix.de>
clockevents_notify() is a leftover from the early design of the
clockevents facility. It's really not a notification mechanism, it's a
multiplex call. We are way better off to have explicit calls instead of this
monstrosity.
Split out the cleanup function for a dead cpu and invoke it directly
from the cpu down code. Make it conditional on CPU_HOTPLUG as well.
Temporary change, will be refined in later patches.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/clockchips.h | 1
include/linux/tick.h | 2 +
kernel/cpu.c | 1
kernel/time/clockevents.c | 61 +++++++++++++++++++++++++------------------
kernel/time/hrtimer.c | 3 --
kernel/time/tick-broadcast.c | 29 ++++++++++----------
kernel/time/tick-common.c | 6 ++--
kernel/time/tick-internal.h | 10 +++----
8 files changed, 62 insertions(+), 51 deletions(-)
Index: linux/include/linux/clockchips.h
===================================================================
--- linux.orig/include/linux/clockchips.h
+++ linux/include/linux/clockchips.h
@@ -16,7 +16,6 @@ enum clock_event_nofitiers {
CLOCK_EVT_NOTIFY_BROADCAST_FORCE,
CLOCK_EVT_NOTIFY_BROADCAST_ENTER,
CLOCK_EVT_NOTIFY_BROADCAST_EXIT,
- CLOCK_EVT_NOTIFY_CPU_DEAD,
};
#ifdef CONFIG_GENERIC_CLOCKEVENTS
Index: linux/include/linux/tick.h
===================================================================
--- linux.orig/include/linux/tick.h
+++ linux/include/linux/tick.h
@@ -30,10 +30,12 @@ extern void __init tick_init(void);
/* Should be core only, but XEN resume magic requires this */
extern void tick_resume_local(void);
extern void tick_handover_do_timer(void);
+extern void tick_cleanup_dead_cpu(int cpu);
#else /* CONFIG_GENERIC_CLOCKEVENTS */
static inline void tick_init(void) { }
static inline void tick_resume_local(void) { }
static inline void tick_handover_do_timer(void) { }
+static inline void tick_cleanup_dead_cpu(int cpu) { }
#endif /* !CONFIG_GENERIC_CLOCKEVENTS */
#ifdef CONFIG_TICK_ONESHOT
Index: linux/kernel/cpu.c
===================================================================
--- linux.orig/kernel/cpu.c
+++ linux/kernel/cpu.c
@@ -428,6 +428,7 @@ static int __ref _cpu_down(unsigned int
__cpu_die(cpu);
/* CPU is completely dead: tell everyone. Too late to complain. */
+ tick_cleanup_dead_cpu(cpu);
cpu_notify_nofail(CPU_DEAD | mod, hcpu);
check_for_tasks(cpu);
Index: linux/kernel/time/clockevents.c
===================================================================
--- linux.orig/kernel/time/clockevents.c
+++ linux/kernel/time/clockevents.c
@@ -538,15 +538,49 @@ void clockevents_resume(void)
dev->resume(dev);
}
+#ifdef CONFIG_HOTPLUG_CPU
+/**
+ * tick_cleanup_dead_cpu - Cleanup the tick and clockevents of a dead cpu
+ */
+void tick_cleanup_dead_cpu(int cpu)
+{
+ struct clock_event_device *dev, *tmp;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&clockevents_lock, flags);
+
+ tick_shutdown_broadcast_oneshot(cpu);
+ tick_shutdown_broadcast(cpu);
+ tick_shutdown(cpu);
+ /*
+ * Unregister the clock event devices which were
+ * released from the users in the notify chain.
+ */
+ list_for_each_entry_safe(dev, tmp, &clockevents_released, list)
+ list_del(&dev->list);
+ /*
+ * Now check whether the CPU has left unused per cpu devices
+ */
+ list_for_each_entry_safe(dev, tmp, &clockevent_devices, list) {
+ if (cpumask_test_cpu(cpu, dev->cpumask) &&
+ cpumask_weight(dev->cpumask) == 1 &&
+ !tick_is_broadcast_device(dev)) {
+ BUG_ON(dev->mode != CLOCK_EVT_MODE_UNUSED);
+ list_del(&dev->list);
+ }
+ }
+ raw_spin_unlock_irqrestore(&clockevents_lock, flags);
+}
+#endif
+
/**
* clockevents_notify - notification about relevant events
* Returns 0 on success, any other value on error
*/
int clockevents_notify(unsigned long reason, void *arg)
{
- struct clock_event_device *dev, *tmp;
unsigned long flags;
- int cpu, ret = 0;
+ int ret = 0;
raw_spin_lock_irqsave(&clockevents_lock, flags);
@@ -562,29 +596,6 @@ int clockevents_notify(unsigned long rea
ret = tick_broadcast_oneshot_control(reason);
break;
- case CLOCK_EVT_NOTIFY_CPU_DEAD:
- tick_shutdown_broadcast_oneshot(arg);
- tick_shutdown_broadcast(arg);
- tick_shutdown(arg);
- /*
- * Unregister the clock event devices which were
- * released from the users in the notify chain.
- */
- list_for_each_entry_safe(dev, tmp, &clockevents_released, list)
- list_del(&dev->list);
- /*
- * Now check whether the CPU has left unused per cpu devices
- */
- cpu = *((int *)arg);
- list_for_each_entry_safe(dev, tmp, &clockevent_devices, list) {
- if (cpumask_test_cpu(cpu, dev->cpumask) &&
- cpumask_weight(dev->cpumask) == 1 &&
- !tick_is_broadcast_device(dev)) {
- BUG_ON(dev->mode != CLOCK_EVT_MODE_UNUSED);
- list_del(&dev->list);
- }
- }
- break;
default:
break;
}
Index: linux/kernel/time/hrtimer.c
===================================================================
--- linux.orig/kernel/time/hrtimer.c
+++ linux/kernel/time/hrtimer.c
@@ -1717,11 +1717,8 @@ static int hrtimer_cpu_notify(struct not
#ifdef CONFIG_HOTPLUG_CPU
case CPU_DEAD:
case CPU_DEAD_FROZEN:
- {
- clockevents_notify(CLOCK_EVT_NOTIFY_CPU_DEAD, &scpu);
migrate_hrtimers(scpu);
break;
- }
#endif
default:
Index: linux/kernel/time/tick-broadcast.c
===================================================================
--- linux.orig/kernel/time/tick-broadcast.c
+++ linux/kernel/time/tick-broadcast.c
@@ -418,14 +418,14 @@ void tick_set_periodic_handler(struct cl
dev->event_handler = tick_handle_periodic_broadcast;
}
+#ifdef CONFIG_HOTPLUG_CPU
/*
* Remove a CPU from broadcasting
*/
-void tick_shutdown_broadcast(unsigned int *cpup)
+void tick_shutdown_broadcast(unsigned int cpu)
{
struct clock_event_device *bc;
unsigned long flags;
- unsigned int cpu = *cpup;
raw_spin_lock_irqsave(&tick_broadcast_lock, flags);
@@ -440,6 +440,7 @@ void tick_shutdown_broadcast(unsigned in
raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);
}
+#endif
void tick_suspend_broadcast(void)
{
@@ -683,16 +684,6 @@ static void broadcast_shutdown_local(str
clockevents_set_mode(dev, CLOCK_EVT_MODE_SHUTDOWN);
}
-static void broadcast_move_bc(int deadcpu)
-{
- struct clock_event_device *bc = tick_broadcast_device.evtdev;
-
- if (!bc || !broadcast_needs_cpu(bc, deadcpu))
- return;
- /* This moves the broadcast assignment to this cpu */
- clockevents_program_event(bc, bc->next_event, 1);
-}
-
/*
* Powerstate information: The system enters/leaves a state, where
* affected devices might stop
@@ -908,14 +899,23 @@ void tick_broadcast_switch_to_oneshot(vo
raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);
}
+#ifdef CONFIG_HOTPLUG_CPU
+static void broadcast_move_bc(int deadcpu)
+{
+ struct clock_event_device *bc = tick_broadcast_device.evtdev;
+
+ if (!bc || !broadcast_needs_cpu(bc, deadcpu))
+ return;
+ /* This moves the broadcast assignment to this cpu */
+ clockevents_program_event(bc, bc->next_event, 1);
+}
/*
* Remove a dead CPU from broadcasting
*/
-void tick_shutdown_broadcast_oneshot(unsigned int *cpup)
+void tick_shutdown_broadcast_oneshot(unsigned int cpu)
{
unsigned long flags;
- unsigned int cpu = *cpup;
raw_spin_lock_irqsave(&tick_broadcast_lock, flags);
@@ -931,6 +931,7 @@ void tick_shutdown_broadcast_oneshot(uns
raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);
}
+#endif
/*
* Check, whether the broadcast device is in one shot mode
Index: linux/kernel/time/tick-common.c
===================================================================
--- linux.orig/kernel/time/tick-common.c
+++ linux/kernel/time/tick-common.c
@@ -348,7 +348,6 @@ void tick_handover_do_timer(void)
TICK_DO_TIMER_NONE;
}
}
-#endif
/*
* Shutdown an event device on a given cpu:
@@ -357,9 +356,9 @@ void tick_handover_do_timer(void)
* access the hardware device itself.
* We just set the mode and remove it from the lists.
*/
-void tick_shutdown(unsigned int *cpup)
+void tick_shutdown(unsigned int cpu)
{
- struct tick_device *td = &per_cpu(tick_cpu_device, *cpup);
+ struct tick_device *td = &per_cpu(tick_cpu_device, cpu);
struct clock_event_device *dev = td->evtdev;
td->mode = TICKDEV_MODE_PERIODIC;
@@ -374,6 +373,7 @@ void tick_shutdown(unsigned int *cpup)
td->evtdev = NULL;
}
}
+#endif
/**
* tick_suspend - Suspend the tick and the broadcast device
Index: linux/kernel/time/tick-internal.h
===================================================================
--- linux.orig/kernel/time/tick-internal.h
+++ linux/kernel/time/tick-internal.h
@@ -20,7 +20,7 @@ extern int tick_do_timer_cpu __read_most
extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
extern void tick_handle_periodic(struct clock_event_device *dev);
extern void tick_check_new_device(struct clock_event_device *dev);
-extern void tick_shutdown(unsigned int *cpup);
+extern void tick_shutdown(unsigned int cpu);
extern void tick_suspend(void);
extern void tick_resume(void);
extern bool tick_check_replacement(struct clock_event_device *curdev,
@@ -79,7 +79,7 @@ extern int tick_device_uses_broadcast(st
extern void tick_install_broadcast_device(struct clock_event_device *dev);
extern int tick_is_broadcast_device(struct clock_event_device *dev);
extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
-extern void tick_shutdown_broadcast(unsigned int *cpup);
+extern void tick_shutdown_broadcast(unsigned int cpu);
extern void tick_suspend_broadcast(void);
extern void tick_resume_broadcast(void);
extern bool tick_resume_check_broadcast(void);
@@ -94,7 +94,7 @@ static inline int tick_is_broadcast_devi
static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; }
static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
-static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
+static inline void tick_shutdown_broadcast(unsigned int cpu) { }
static inline void tick_suspend_broadcast(void) { }
static inline void tick_resume_broadcast(void) { }
static inline bool tick_resume_check_broadcast(void) { return false; }
@@ -113,7 +113,7 @@ static inline void tick_set_periodic_han
extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
extern int tick_broadcast_oneshot_control(unsigned long reason);
extern void tick_broadcast_switch_to_oneshot(void);
-extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
+extern void tick_shutdown_broadcast_oneshot(unsigned int cpu);
extern int tick_broadcast_oneshot_active(void);
extern void tick_check_oneshot_broadcast_this_cpu(void);
bool tick_broadcast_oneshot_available(void);
@@ -122,7 +122,7 @@ extern struct cpumask *tick_get_broadcas
static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) { BUG(); }
static inline int tick_broadcast_oneshot_control(unsigned long reason) { return 0; }
static inline void tick_broadcast_switch_to_oneshot(void) { }
-static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
+static inline void tick_shutdown_broadcast_oneshot(unsigned int cpu) { }
static inline int tick_broadcast_oneshot_active(void) { return 0; }
static inline void tick_check_oneshot_broadcast_this_cpu(void) { }
static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); }
next prev parent reply other threads:[~2015-02-16 13:18 UTC|newest]
Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-16 12:14 [PATCH 00/35] Some kernel/time cleanups Peter Zijlstra
2015-02-16 12:14 ` [PATCH 01/35] ACPI/acpi_pad: Remove the local apic nonsense Peter Zijlstra
2015-02-16 18:54 ` Rafael J. Wysocki
2015-02-18 6:16 ` Rafael J. Wysocki
2015-02-16 12:14 ` [PATCH 02/35] clockevents: Remove CONFIG_GENERIC_CLOCKEVENTS_BUILD Peter Zijlstra
2015-02-16 12:14 ` [PATCH 03/35] tick: Cleanup internal header files Peter Zijlstra
2015-02-16 12:14 ` [PATCH 04/35] tick: Cleanup internal header file Peter Zijlstra
2015-02-16 12:14 ` [PATCH 05/35] tick: Move core only declarations and functions to core Peter Zijlstra
2015-02-16 12:14 ` [PATCH 06/35] clockevents: Remove extra local_irq_save in clockevents_exchange_device() Peter Zijlstra
2015-02-16 12:14 ` [PATCH 07/35] clockevents: Make suspend/resume calls explicit Peter Zijlstra
2015-02-16 19:07 ` Rafael J. Wysocki
2015-02-16 12:14 ` [PATCH 08/35] tick: Make tick_resume_broadcast_oneshot static Peter Zijlstra
2015-02-16 12:14 ` [PATCH 09/35] tick/xen: Provide and use tick_resume_local() Peter Zijlstra
2015-02-16 16:37 ` David Vrabel
2015-02-16 12:14 ` [PATCH 10/35] clockevents: Make tick handover explicit Peter Zijlstra
2015-02-16 12:14 ` Peter Zijlstra [this message]
2015-02-16 12:14 ` [PATCH 12/35] clockevents: Provide explicit broadcast control function Peter Zijlstra
2015-02-23 18:08 ` Daniel Lezcano
2015-02-24 0:38 ` Tony Lindgren
2015-02-16 12:14 ` [PATCH 13/35] x86, amd_idle: Use explicit broadcast control functions Peter Zijlstra
2015-02-16 12:14 ` [PATCH 14/35] ACPI / PAD: Use explicit broadcast control function Peter Zijlstra
2015-02-16 12:14 ` [PATCH 15/35] ACPI/ processor_idle: Use explicit broadcast controll function Peter Zijlstra
2015-02-16 12:14 ` [PATCH 16/35] cpuidle: Use explicit broadcast control function Peter Zijlstra
2015-02-23 18:11 ` Daniel Lezcano
2015-02-16 12:14 ` [PATCH 17/35] intel_idle: " Peter Zijlstra
2015-02-16 12:14 ` [PATCH 18/35] ARM: OMAP: " Peter Zijlstra
2015-02-24 0:40 ` Tony Lindgren
2015-02-16 12:14 ` [PATCH 19/35] clockevents: Remove the broadcast control leftovers Peter Zijlstra
2015-02-16 12:14 ` [PATCH 20/35] clockevents: Provide explicit broadcast oneshot control function Peter Zijlstra
2015-02-24 0:41 ` Tony Lindgren
2015-02-16 12:14 ` [PATCH 21/35] x86, amd_idle: Use explicit broadcast oneshot control functions Peter Zijlstra
2015-02-16 12:14 ` [PATCH 22/35] ACPI / PAD: Use explicit broadcast oneshot control function Peter Zijlstra
2015-02-16 12:14 ` [PATCH 23/35] ACPI/ processor_idle: Use explicit broadcast oneshot controll function Peter Zijlstra
2015-02-16 12:14 ` [PATCH 24/35] intel_idle: Use explicit broadcast oneshot control function Peter Zijlstra
2015-02-16 12:15 ` [PATCH 25/35] ARM: OMAP: " Peter Zijlstra
2015-02-24 0:41 ` Tony Lindgren
2015-02-16 12:15 ` [PATCH 26/35] ARM: tegra: " Peter Zijlstra
2015-02-16 12:15 ` [PATCH 27/35] sched/idle: " Peter Zijlstra
2015-02-21 0:56 ` Nicolas Pitre
2015-02-21 11:19 ` Peter Zijlstra
2015-02-16 12:15 ` [PATCH 28/35] clockevents: Remove the broadcast oneshot control leftovers Peter Zijlstra
2015-02-16 12:15 ` [PATCH 29/35] tick/timekeeping: Make PM_SLEEP related code conditional Peter Zijlstra
2015-02-16 12:15 ` [PATCH 30/35] timekeeping: Get rid of stale comment Peter Zijlstra
2015-02-16 12:15 ` [PATCH 31/35] clockevents: Consolidate tick_shutdown() Peter Zijlstra
2015-02-16 12:15 ` [PATCH 32/35] clockevents: Fix cpu down race for hrtimer based broadcasting Peter Zijlstra
2015-02-17 4:03 ` Preeti U Murthy
2015-02-17 10:39 ` Peter Zijlstra
2015-02-18 3:10 ` Preeti U Murthy
2015-02-18 13:06 ` Peter Zijlstra
2015-02-19 7:01 ` Preeti U Murthy
2015-02-19 9:53 ` Peter Zijlstra
2015-02-19 17:51 ` Nicolas Pitre
2015-02-21 12:46 ` Peter Zijlstra
2015-02-21 17:45 ` Nicolas Pitre
2015-02-23 16:14 ` Peter Zijlstra
2015-02-23 16:32 ` Nicolas Pitre
2015-02-23 17:33 ` Nicolas Pitre
2015-02-26 5:31 ` Preeti U Murthy
2015-02-27 8:49 ` Preeti U Murthy
2015-03-02 14:56 ` Peter Zijlstra
2015-03-05 4:20 ` Preeti U Murthy
2015-03-29 6:45 ` Ingo Molnar
2015-03-16 4:52 ` Preeti U Murthy
2015-03-25 5:32 ` Preeti U Murthy
2015-02-16 12:15 ` [PATCH 33/35] tick: Make hrtimer broadcasting opt-in Peter Zijlstra
2015-02-17 3:06 ` Preeti U Murthy
2015-02-17 10:04 ` Lorenzo Pieralisi
2015-02-16 12:15 ` [PATCH 34/35] tick: Provide tick_suspend_local() Peter Zijlstra
2015-02-17 14:31 ` Lorenzo Pieralisi
2015-02-17 17:55 ` Nicolas Pitre
2015-02-17 21:29 ` Nicolas Pitre
2015-02-18 13:35 ` Peter Zijlstra
2015-02-18 16:22 ` Rafael J. Wysocki
2015-02-18 16:38 ` Lorenzo Pieralisi
2015-02-16 12:15 ` [PATCH 35/35] arm: bl_switcher: Kill tick suspend hackery Peter Zijlstra
2015-02-16 19:14 ` [PATCH 00/35] Some kernel/time cleanups Rafael J. Wysocki
2015-03-25 12:04 ` [PATCH 00/09] Some kernel/time cleanups (related to timer_suspend/resume) Rafael J. Wysocki
2015-03-25 12:05 ` [PATCH 01/09] clockevents: Remove CONFIG_GENERIC_CLOCKEVENTS_BUILD Rafael J. Wysocki
2015-04-02 12:28 ` [tip:timers/core] " tip-bot for Thomas Gleixner
2015-03-25 12:06 ` [PATCH 02/09] tick: Move clocksource related stuff to timekeeping.h Rafael J. Wysocki
2015-04-02 12:28 ` [tip:timers/core] " tip-bot for Thomas Gleixner
2015-03-25 12:06 ` [PATCH 03/09] tick: Simplify tick-internal.h Rafael J. Wysocki
2015-04-02 12:29 ` [tip:timers/core] " tip-bot for Thomas Gleixner
2015-03-25 12:07 ` [PATCH 04/09] tick: Move core only declarations and functions to core Rafael J. Wysocki
2015-04-02 12:29 ` [tip:timers/core] " tip-bot for Thomas Gleixner
2015-03-25 12:08 ` [PATCH 05/09] clockevents: Remove extra local_irq_save in clockevents_exchange_device() Rafael J. Wysocki
2015-04-02 12:29 ` [tip:timers/core] clockevents: Remove extra local_irq_save() " tip-bot for Thomas Gleixner
2015-03-25 12:09 ` [PATCH 06/09] clockevents: Make suspend/resume calls explicit Rafael J. Wysocki
2015-04-02 12:30 ` [tip:timers/core] " tip-bot for Thomas Gleixner
2015-03-25 12:09 ` [PATCH 07/09] tick: Make tick_resume_broadcast_oneshot static Rafael J. Wysocki
2015-04-02 12:30 ` [tip:timers/core] tick: Make tick_resume_broadcast_oneshot() static tip-bot for Thomas Gleixner
2015-03-25 12:11 ` [PATCH 08/09] tick/xen: Provide and use tick_suspend_local() and tick_resume_local() Rafael J. Wysocki
2015-03-25 20:13 ` Konrad Rzeszutek Wilk
2015-03-25 20:57 ` Rafael J. Wysocki
2015-03-25 20:44 ` Konrad Rzeszutek Wilk
2015-03-25 21:36 ` Rafael J. Wysocki
2015-04-02 12:30 ` [tip:timers/core] " tip-bot for Thomas Gleixner
2015-04-03 13:21 ` [PATCH][fix for tip/timers/core] timers / PM: Fix up tick_unfreeze() Rafael J. Wysocki
2015-04-03 13:18 ` [tip:timers/core] timers/PM: " tip-bot for Rafael J. Wysocki
2015-04-03 13:31 ` [PATCH][cleanup for tip/timers/core] timers / PM: Drop unnecessary braces from tick_freeze() Rafael J. Wysocki
2015-04-03 13:18 ` [tip:timers/core] timers/PM: " tip-bot for Rafael J. Wysocki
2015-03-25 12:11 ` [PATCH 09/09] arm: bl_switcher: Kill tick suspend hackery Rafael J. Wysocki
2015-03-25 12:34 ` Nicolas Pitre
2015-04-02 12:30 ` [tip:timers/core] arm/bL_switcher: " tip-bot for Thomas Gleixner
2015-03-25 12:13 ` [PATCH 00/09] Some kernel/time cleanups (related to timer_suspend/resume) Rafael J. Wysocki
2015-03-31 22:45 ` [GIT PULL] kernel/time cleanups (related to tick_suspend/resume) Rafael J. Wysocki
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