Commit 59d06cea authored by Juri Lelli's avatar Juri Lelli Committed by Ingo Molnar

sched/deadline: Fix bandwidth accounting at all levels after offline migration

If a task happens to be throttled while the CPU it was running on gets
hotplugged off, the bandwidth associated with the task is not correctly
migrated with it when the replenishment timer fires (offline_migration).

Fix things up, for this_bw, running_bw and total_bw, when replenishment
timer fires and task is migrated (dl_task_offline_migration()).
Tested-by: default avatarDietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: default avatarJuri Lelli <juri.lelli@redhat.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: bristot@redhat.com
Cc: claudio@evidence.eu.com
Cc: lizefan@huawei.com
Cc: longman@redhat.com
Cc: luca.abeni@santannapisa.it
Cc: mathieu.poirier@linaro.org
Cc: rostedt@goodmis.org
Cc: tj@kernel.org
Cc: tommaso.cucinotta@santannapisa.it
Link: https://lkml.kernel.org/r/20190719140000.31694-5-juri.lelli@redhat.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent f9a25f77
...@@ -529,6 +529,7 @@ static struct rq *find_lock_later_rq(struct task_struct *task, struct rq *rq); ...@@ -529,6 +529,7 @@ static struct rq *find_lock_later_rq(struct task_struct *task, struct rq *rq);
static struct rq *dl_task_offline_migration(struct rq *rq, struct task_struct *p) static struct rq *dl_task_offline_migration(struct rq *rq, struct task_struct *p)
{ {
struct rq *later_rq = NULL; struct rq *later_rq = NULL;
struct dl_bw *dl_b;
later_rq = find_lock_later_rq(p, rq); later_rq = find_lock_later_rq(p, rq);
if (!later_rq) { if (!later_rq) {
...@@ -557,6 +558,38 @@ static struct rq *dl_task_offline_migration(struct rq *rq, struct task_struct *p ...@@ -557,6 +558,38 @@ static struct rq *dl_task_offline_migration(struct rq *rq, struct task_struct *p
double_lock_balance(rq, later_rq); double_lock_balance(rq, later_rq);
} }
if (p->dl.dl_non_contending || p->dl.dl_throttled) {
/*
* Inactive timer is armed (or callback is running, but
* waiting for us to release rq locks). In any case, when it
* will fire (or continue), it will see running_bw of this
* task migrated to later_rq (and correctly handle it).
*/
sub_running_bw(&p->dl, &rq->dl);
sub_rq_bw(&p->dl, &rq->dl);
add_rq_bw(&p->dl, &later_rq->dl);
add_running_bw(&p->dl, &later_rq->dl);
} else {
sub_rq_bw(&p->dl, &rq->dl);
add_rq_bw(&p->dl, &later_rq->dl);
}
/*
* And we finally need to fixup root_domain(s) bandwidth accounting,
* since p is still hanging out in the old (now moved to default) root
* domain.
*/
dl_b = &rq->rd->dl_bw;
raw_spin_lock(&dl_b->lock);
__dl_sub(dl_b, p->dl.dl_bw, cpumask_weight(rq->rd->span));
raw_spin_unlock(&dl_b->lock);
dl_b = &later_rq->rd->dl_bw;
raw_spin_lock(&dl_b->lock);
__dl_add(dl_b, p->dl.dl_bw, cpumask_weight(later_rq->rd->span));
raw_spin_unlock(&dl_b->lock);
set_task_cpu(p, later_rq->cpu); set_task_cpu(p, later_rq->cpu);
double_unlock_balance(later_rq, rq); double_unlock_balance(later_rq, rq);
......
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