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| author | Peter Zijlstra <peterz@infradead.org> | 2015-05-15 17:43:35 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-08-12 12:06:09 +0200 |
| commit | c5b2803840817115e9b568d5054e5007ae36176b (patch) | |
| tree | cf95c50a52bf6e99c9c7eaff63534b535d7ba0c2 /kernel/sched/core.c | |
| parent | 25834c73f93af7f0712c98ca4593691592e6b360 (diff) | |
| download | blackbird-op-linux-c5b2803840817115e9b568d5054e5007ae36176b.tar.gz blackbird-op-linux-c5b2803840817115e9b568d5054e5007ae36176b.zip | |
sched: Make sched_class::set_cpus_allowed() unconditional
Give every class a set_cpus_allowed() method, this enables some small
optimization in the RT,DL implementation by avoiding a double
cpumask_weight() call.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dedekind1@gmail.com
Cc: juri.lelli@arm.com
Cc: mgorman@suse.de
Cc: riel@redhat.com
Cc: rostedt@goodmis.org
Link: http://lkml.kernel.org/r/20150515154833.614517487@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/core.c')
| -rw-r--r-- | kernel/sched/core.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 2e3b983da836..740f90bdc67b 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1151,17 +1151,22 @@ static int migration_cpu_stop(void *data) return 0; } -void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) +/* + * sched_class::set_cpus_allowed must do the below, but is not required to + * actually call this function. + */ +void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask) { - lockdep_assert_held(&p->pi_lock); - - if (p->sched_class->set_cpus_allowed) - p->sched_class->set_cpus_allowed(p, new_mask); - cpumask_copy(&p->cpus_allowed, new_mask); p->nr_cpus_allowed = cpumask_weight(new_mask); } +void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) +{ + lockdep_assert_held(&p->pi_lock); + p->sched_class->set_cpus_allowed(p, new_mask); +} + /* * Change a given task's CPU affinity. Migrate the thread to a * proper CPU and schedule it away if the CPU it's executing on |
