Bridge the boot-time 'isolcpus' and 'nohz_full' parameters with the DHEI sysfs interface. Ensure that housekeeping_init() correctly initializes the isolation state and that subsequent sysfs updates can take over management even if no isolation was configured at boot.
Remove __init from sched_tick_offload_init() and update it to be safe for multiple calls. This allows DHEI to initialize tick offload infrastructure at runtime when the first tick-isolated core is configured. Signed-off-by: Qiliang Yuan <[email protected]> Signed-off-by: Qiliang Yuan <[email protected]> --- kernel/sched/core.c | 5 ++++- kernel/sched/isolation.c | 3 +++ kernel/sched/sched.h | 2 +- 3 files changed, 8 insertions(+), 2 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 045f83ad261e..d155e1132d6b 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -5685,8 +5685,11 @@ static void sched_tick_stop(int cpu) } #endif /* CONFIG_HOTPLUG_CPU */ -int __init sched_tick_offload_init(void) +int sched_tick_offload_init(void) { + if (tick_work_cpu) + return 0; + tick_work_cpu = alloc_percpu(struct tick_work); BUG_ON(!tick_work_cpu); return 0; diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c index 30798e790b9f..76c039a01fb0 100644 --- a/kernel/sched/isolation.c +++ b/kernel/sched/isolation.c @@ -241,6 +241,9 @@ static ssize_t housekeeping_store(struct kobject *kobject, housekeeping.flags |= BIT(type); static_branch_enable(&housekeeping_overridden); + if (type == HK_TYPE_TICK || type == HK_TYPE_TIMER || type == HK_TYPE_RCU) + sched_tick_offload_init(); + housekeeping_update_notify(type, new_mask); err = count; diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 93fce4bbff5e..0079e7210c38 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -2867,7 +2867,7 @@ extern void post_init_entity_util_avg(struct task_struct *p); #ifdef CONFIG_NO_HZ_FULL extern bool sched_can_stop_tick(struct rq *rq); -extern int __init sched_tick_offload_init(void); +extern int sched_tick_offload_init(void); /* * Tick may be needed by tasks in the runqueue depending on their policy and -- 2.51.0
