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sched: Allow put_prev_task() to drop rq->lock

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Currently the pick_next_task() loop is convoluted and ugly because of
how it can drop the rq->lock and needs to restart the picking.

For the RT/Deadline classes, it is put_prev_task() where we do
balancing, and we could do this before the picking loop. Make this
possible.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: Aaron Lu <aaron.lwe@gmail.com>
Cc: mingo@kernel.org
Cc: Phil Auld <pauld@redhat.com>
Cc: Julien Desfossez <jdesfossez@digitalocean.com>
Cc: Nishanth Aravamudan <naravamudan@digitalocean.com>
Link: https://lkml.kernel.org/r/e4519f6850477ab7f3d257062796e6425ee4ba7c.1559129225.git.vpillai@digitalocean.com
This commit is contained in:
Peter Zijlstra
2019-05-29 20:36:43 +00:00
parent 5ba553eff0
commit 5f2a45fc9e
7 changed files with 32 additions and 8 deletions
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2
kernel/sched/fair.c
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@@ -6901,7 +6901,7 @@ idle:
/*
* Account for a descheduled task:
*/
static void put_prev_task_fair(struct rq *rq, struct task_struct *prev)
static void put_prev_task_fair(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
{
struct sched_entity *se = &prev->se;
struct cfs_rq *cfs_rq;