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| author | Oleg Nesterov <oleg@redhat.com> | 2015-10-09 18:00:49 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-10-20 10:23:55 +0200 |
| commit | c00166d87e730088d919814020e96ffed129d0d1 (patch) | |
| tree | 89194ca8d10e2c6ceddf203958e65787927d9f9b /kernel/smpboot.c | |
| parent | d8bc853582bfd81a9c08ca6922aeb01570080ccc (diff) | |
| download | linux-c00166d87e730088d919814020e96ffed129d0d1.tar.gz linux-c00166d87e730088d919814020e96ffed129d0d1.tar.bz2 linux-c00166d87e730088d919814020e96ffed129d0d1.zip | |
stop_machine: Kill smp_hotplug_thread->pre_unpark, introduce stop_machine_unpark()
1. Change smpboot_unpark_thread() to check ->selfparking, just
like smpboot_park_thread() does.
2. Introduce stop_machine_unpark() which sets ->enabled and calls
kthread_unpark().
3. Change smpboot_thread_call() and cpu_stop_init() to call
stop_machine_unpark() by hand.
This way:
- IMO the ->selfparking logic becomes more consistent.
- We can kill the smp_hotplug_thread->pre_unpark() method.
- We can easily unpark the stopper thread earlier. Say, we
can move stop_machine_unpark() from smpboot_thread_call()
to sched_cpu_active() as Peter suggests.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: heiko.carstens@de.ibm.com
Link: http://lkml.kernel.org/r/20151009160049.GA10166@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/smpboot.c')
| -rw-r--r-- | kernel/smpboot.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/kernel/smpboot.c b/kernel/smpboot.c index a818cbc73e14..d264f59bff56 100644 --- a/kernel/smpboot.c +++ b/kernel/smpboot.c @@ -222,9 +222,8 @@ static void smpboot_unpark_thread(struct smp_hotplug_thread *ht, unsigned int cp { struct task_struct *tsk = *per_cpu_ptr(ht->store, cpu); - if (ht->pre_unpark) - ht->pre_unpark(cpu); - kthread_unpark(tsk); + if (!ht->selfparking) + kthread_unpark(tsk); } void smpboot_unpark_threads(unsigned int cpu) |