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authorThomas Gleixner <tglx@linutronix.de>2023-11-07 15:57:13 +0100
committerThomas Gleixner <tglx@linutronix.de>2023-11-11 18:06:42 +0100
commit5c0930ccaad5a74d74e8b18b648c5eb21ed2fe94 (patch)
tree005e4da3715f5fa8861ceffcd6216d9b37cfca37
parentLinux 6.6 (diff)
downloadlinux-5c0930ccaad5a74d74e8b18b648c5eb21ed2fe94.tar.xz
linux-5c0930ccaad5a74d74e8b18b648c5eb21ed2fe94.zip
hrtimers: Push pending hrtimers away from outgoing CPU earlier
2b8272ff4a70 ("cpu/hotplug: Prevent self deadlock on CPU hot-unplug") solved the straight forward CPU hotplug deadlock vs. the scheduler bandwidth timer. Yu discovered a more involved variant where a task which has a bandwidth timer started on the outgoing CPU holds a lock and then gets throttled. If the lock required by one of the CPU hotplug callbacks the hotplug operation deadlocks because the unthrottling timer event is not handled on the dying CPU and can only be recovered once the control CPU reaches the hotplug state which pulls the pending hrtimers from the dead CPU. Solve this by pushing the hrtimers away from the dying CPU in the dying callbacks. Nothing can queue a hrtimer on the dying CPU at that point because all other CPUs spin in stop_machine() with interrupts disabled and once the operation is finished the CPU is marked offline. Reported-by: Yu Liao <liaoyu15@huawei.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Liu Tie <liutie4@huawei.com> Link: https://lore.kernel.org/r/87a5rphara.ffs@tglx
-rw-r--r--include/linux/cpuhotplug.h1
-rw-r--r--include/linux/hrtimer.h4
-rw-r--r--kernel/cpu.c8
-rw-r--r--kernel/time/hrtimer.c33
4 files changed, 22 insertions, 24 deletions
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 068f7738be22..448f5f995adc 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -193,6 +193,7 @@ enum cpuhp_state {
CPUHP_AP_ARM_CORESIGHT_CTI_STARTING,
CPUHP_AP_ARM64_ISNDEP_STARTING,
CPUHP_AP_SMPCFD_DYING,
+ CPUHP_AP_HRTIMERS_DYING,
CPUHP_AP_X86_TBOOT_DYING,
CPUHP_AP_ARM_CACHE_B15_RAC_DYING,
CPUHP_AP_ONLINE,
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 0ee140176f10..f2044d5a652b 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -531,9 +531,9 @@ extern void sysrq_timer_list_show(void);
int hrtimers_prepare_cpu(unsigned int cpu);
#ifdef CONFIG_HOTPLUG_CPU
-int hrtimers_dead_cpu(unsigned int cpu);
+int hrtimers_cpu_dying(unsigned int cpu);
#else
-#define hrtimers_dead_cpu NULL
+#define hrtimers_cpu_dying NULL
#endif
#endif
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 6de7c6bb74ee..2e69a1deaa31 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -2098,7 +2098,7 @@ static struct cpuhp_step cpuhp_hp_states[] = {
[CPUHP_HRTIMERS_PREPARE] = {
.name = "hrtimers:prepare",
.startup.single = hrtimers_prepare_cpu,
- .teardown.single = hrtimers_dead_cpu,
+ .teardown.single = NULL,
},
[CPUHP_SMPCFD_PREPARE] = {
.name = "smpcfd:prepare",
@@ -2190,6 +2190,12 @@ static struct cpuhp_step cpuhp_hp_states[] = {
.startup.single = NULL,
.teardown.single = smpcfd_dying_cpu,
},
+ [CPUHP_AP_HRTIMERS_DYING] = {
+ .name = "hrtimers:dying",
+ .startup.single = NULL,
+ .teardown.single = hrtimers_cpu_dying,
+ },
+
/* Entry state on starting. Interrupts enabled from here on. Transient
* state for synchronsization */
[CPUHP_AP_ONLINE] = {
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 238262e4aba7..760793998cdd 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -2219,29 +2219,22 @@ static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
}
}
-int hrtimers_dead_cpu(unsigned int scpu)
+int hrtimers_cpu_dying(unsigned int dying_cpu)
{
struct hrtimer_cpu_base *old_base, *new_base;
- int i;
+ int i, ncpu = cpumask_first(cpu_active_mask);
- BUG_ON(cpu_online(scpu));
- tick_cancel_sched_timer(scpu);
+ tick_cancel_sched_timer(dying_cpu);
+
+ old_base = this_cpu_ptr(&hrtimer_bases);
+ new_base = &per_cpu(hrtimer_bases, ncpu);
- /*
- * this BH disable ensures that raise_softirq_irqoff() does
- * not wakeup ksoftirqd (and acquire the pi-lock) while
- * holding the cpu_base lock
- */
- local_bh_disable();
- local_irq_disable();
- old_base = &per_cpu(hrtimer_bases, scpu);
- new_base = this_cpu_ptr(&hrtimer_bases);
/*
* The caller is globally serialized and nobody else
* takes two locks at once, deadlock is not possible.
*/
- raw_spin_lock(&new_base->lock);
- raw_spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING);
+ raw_spin_lock(&old_base->lock);
+ raw_spin_lock_nested(&new_base->lock, SINGLE_DEPTH_NESTING);
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
migrate_hrtimer_list(&old_base->clock_base[i],
@@ -2252,15 +2245,13 @@ int hrtimers_dead_cpu(unsigned int scpu)
* The migration might have changed the first expiring softirq
* timer on this CPU. Update it.
*/
- hrtimer_update_softirq_timer(new_base, false);
+ __hrtimer_get_next_event(new_base, HRTIMER_ACTIVE_SOFT);
+ /* Tell the other CPU to retrigger the next event */
+ smp_call_function_single(ncpu, retrigger_next_event, NULL, 0);
- raw_spin_unlock(&old_base->lock);
raw_spin_unlock(&new_base->lock);
+ raw_spin_unlock(&old_base->lock);
- /* Check, if we got expired work to do */
- __hrtimer_peek_ahead_timers();
- local_irq_enable();
- local_bh_enable();
return 0;
}