From fc890e9b571fb273e714bae5de682226eaed9cb2 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Tue, 29 May 2018 16:43:46 +0200 Subject: [PATCH] sched/smt: Update sched_smt_present at runtime commit ba2591a5993eabcc8e874e30f361d8ffbb10d6d4 upstream The static key sched_smt_present is only updated at boot time when SMT siblings have been detected. Booting with maxcpus=1 and bringing the siblings online after boot rebuilds the scheduling domains correctly but does not update the static key, so the SMT code is not enabled. Let the key be updated in the scheduler CPU hotplug code to fix this. Signed-off-by: Peter Zijlstra Signed-off-by: Thomas Gleixner Reviewed-by: Konrad Rzeszutek Wilk Acked-by: Ingo Molnar Signed-off-by: Greg Kroah-Hartman --- kernel/sched/core.c | 30 ++++++++++++------------------ kernel/sched/fair.c | 1 + 2 files changed, 13 insertions(+), 18 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 31615d1ae44c..4e89ed8a0fb2 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -5615,6 +5615,18 @@ int sched_cpu_activate(unsigned int cpu) struct rq *rq = cpu_rq(cpu); struct rq_flags rf; +#ifdef CONFIG_SCHED_SMT + /* + * The sched_smt_present static key needs to be evaluated on every + * hotplug event because at boot time SMT might be disabled when + * the number of booted CPUs is limited. + * + * If then later a sibling gets hotplugged, then the key would stay + * off and SMT scheduling would never be functional. + */ + if (cpumask_weight(cpu_smt_mask(cpu)) > 1) + static_branch_enable_cpuslocked(&sched_smt_present); +#endif set_cpu_active(cpu, true); if (sched_smp_initialized) { @@ -5710,22 +5722,6 @@ int sched_cpu_dying(unsigned int cpu) } #endif -#ifdef CONFIG_SCHED_SMT -DEFINE_STATIC_KEY_FALSE(sched_smt_present); - -static void sched_init_smt(void) -{ - /* - * We've enumerated all CPUs and will assume that if any CPU - * has SMT siblings, CPU0 will too. - */ - if (cpumask_weight(cpu_smt_mask(0)) > 1) - static_branch_enable(&sched_smt_present); -} -#else -static inline void sched_init_smt(void) { } -#endif - void __init sched_init_smp(void) { cpumask_var_t non_isolated_cpus; @@ -5755,8 +5751,6 @@ void __init sched_init_smp(void) init_sched_rt_class(); init_sched_dl_class(); - sched_init_smt(); - sched_smp_initialized = true; } diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 5c09ddf8c832..0cc7098c6dfd 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5631,6 +5631,7 @@ find_idlest_cpu(struct sched_group *group, struct task_struct *p, int this_cpu) } #ifdef CONFIG_SCHED_SMT +DEFINE_STATIC_KEY_FALSE(sched_smt_present); static inline void set_idle_cores(int cpu, int val) { -- 2.20.1