[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 1/6] xen/sched: call cpu_disable_scheduler() via cpu notifier
cpu_disable_scheduler() is being called from __cpu_disable() today. There is no need to call it on the cpu just being disabled, so use the CPU_DEAD case of the cpu notifier chain. Signed-off-by: Juergen Gross <jgross@xxxxxxxx> --- xen/arch/x86/smpboot.c | 3 --- xen/common/schedule.c | 12 +++++------- 2 files changed, 5 insertions(+), 10 deletions(-) diff --git a/xen/arch/x86/smpboot.c b/xen/arch/x86/smpboot.c index 7d1226d7bc..b7a0a4a419 100644 --- a/xen/arch/x86/smpboot.c +++ b/xen/arch/x86/smpboot.c @@ -1221,9 +1221,6 @@ void __cpu_disable(void) cpumask_clear_cpu(cpu, &cpu_online_map); fixup_irqs(&cpu_online_map, 1); fixup_eoi(); - - if ( cpu_disable_scheduler(cpu) ) - BUG(); } void __cpu_die(unsigned int cpu) diff --git a/xen/common/schedule.c b/xen/common/schedule.c index 60755a631e..665747f247 100644 --- a/xen/common/schedule.c +++ b/xen/common/schedule.c @@ -773,8 +773,9 @@ void restore_vcpu_affinity(struct domain *d) } /* - * This function is used by cpu_hotplug code from stop_machine context + * This function is used by cpu_hotplug code via cpu notifier chain * and from cpupools to switch schedulers on a cpu. + * Caller must get domlist_read_lock. */ int cpu_disable_scheduler(unsigned int cpu) { @@ -789,12 +790,6 @@ int cpu_disable_scheduler(unsigned int cpu) if ( c == NULL ) return ret; - /* - * We'd need the domain RCU lock, but: - * - when we are called from cpupool code, it's acquired there already; - * - when we are called for CPU teardown, we're in stop-machine context, - * so that's not be a problem. - */ for_each_domain_in_cpupool ( d, c ) { for_each_vcpu ( d, v ) @@ -1738,6 +1733,9 @@ static int cpu_schedule_callback( rc = cpu_schedule_up(cpu); break; case CPU_DEAD: + rcu_read_lock(&domlist_read_lock); + cpu_disable_scheduler(cpu); + rcu_read_unlock(&domlist_read_lock); SCHED_OP(sched, deinit_pdata, sd->sched_priv, cpu); /* Fallthrough */ case CPU_UP_CANCELED: -- 2.16.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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