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cpu/hotplug: Move scheduler cpu_online notifier to hotplug core

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Move the scheduler cpu online notifier part to the hotplug core. This is
anyway the highest priority callback and we need that functionality right now
for the next changes.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arch@vger.kernel.org
Cc: Rik van Riel <riel@redhat.com>
Cc: Rafael Wysocki <rafael.j.wysocki@intel.com>
Cc: "Srivatsa S. Bhat" <srivatsa@mit.edu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Turner <pjt@google.com>
Link: http://lkml.kernel.org/r/20160226182341.200791046@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2016-02-26 18:43:35 +00:00
parent 5b7aa87e04
commit 949338e351
3 changed files with 19 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/cpuhotplug.h
View File

@ -10,6 +10,7 @@ enum cpuhp_state {
CPUHP_AP_NOTIFY_STARTING,
CPUHP_AP_ONLINE,
CPUHP_TEARDOWN_CPU,
CPUHP_CPU_SET_ACTIVE,
CPUHP_NOTIFY_ONLINE,
CPUHP_ONLINE_DYN,
CPUHP_ONLINE_DYN_END = CPUHP_ONLINE_DYN + 30,

18
kernel/cpu.c
View File

@ -666,6 +666,19 @@ void notify_cpu_starting(unsigned int cpu)
}
}
/*
* Called from the idle task. We need to set active here, so we can kick off
* the stopper thread.
*/
static int cpuhp_set_cpu_active(unsigned int cpu)
{
/* The cpu is marked online, set it active now */
set_cpu_active(cpu, true);
/* Unpark the stopper thread */
stop_machine_unpark(cpu);
return 0;
}
static void undo_cpu_up(unsigned int cpu, struct cpuhp_cpu_state *st)
{
for (st->state--; st->state > st->target; st->state--) {
@ -941,6 +954,11 @@ static struct cpuhp_step cpuhp_bp_states[] = {
.teardown = takedown_cpu,
.cant_stop = true,
},
[CPUHP_CPU_SET_ACTIVE] = {
.name = "cpu:active",
.startup = cpuhp_set_cpu_active,
.teardown = NULL,
},
[CPUHP_NOTIFY_ONLINE] = {
.name = "notify:online",
.startup = notify_online,

10
kernel/sched/core.c
View File

@ -5692,16 +5692,6 @@ static int sched_cpu_active(struct notifier_block *nfb,
set_cpu_rq_start_time();
return NOTIFY_OK;
case CPU_ONLINE:
/*
* At this point a starting CPU has marked itself as online via
* set_cpu_online(). But it might not yet have marked itself
* as active, which is essential from here on.
*/
set_cpu_active(cpu, true);
stop_machine_unpark(cpu);
return NOTIFY_OK;
case CPU_DOWN_FAILED:
set_cpu_active(cpu, true);
return NOTIFY_OK;