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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/deadline.c | |
| parent | 25834c73f93af7f0712c98ca4593691592e6b360 (diff) | |
| download | op-kernel-dev-c5b2803840817115e9b568d5054e5007ae36176b.zip op-kernel-dev-c5b2803840817115e9b568d5054e5007ae36176b.tar.gz | |
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/deadline.c')
| -rw-r--r-- | kernel/sched/deadline.c | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index 20772ee..dc357fa 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -1696,13 +1696,6 @@ static void set_cpus_allowed_dl(struct task_struct *p, raw_spin_unlock(&src_dl_b->lock); } - /* - * Update only if the task is actually running (i.e., - * it is on the rq AND it is not throttled). - */ - if (!on_dl_rq(&p->dl)) - return; - weight = cpumask_weight(new_mask); /* @@ -1710,7 +1703,14 @@ static void set_cpus_allowed_dl(struct task_struct *p, * can migrate or not. */ if ((p->nr_cpus_allowed > 1) == (weight > 1)) - return; + goto done; + + /* + * Update only if the task is actually running (i.e., + * it is on the rq AND it is not throttled). + */ + if (!on_dl_rq(&p->dl)) + goto done; /* * The process used to be able to migrate OR it can now migrate @@ -1727,6 +1727,10 @@ static void set_cpus_allowed_dl(struct task_struct *p, } update_dl_migration(&rq->dl); + +done: + cpumask_copy(&p->cpus_allowed, new_mask); + p->nr_cpus_allowed = weight; } /* Assumes rq->lock is held */ |
