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| author | Hao Jia <jiahao.os@bytedance.com> | 2023-06-13 11:20:10 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2023-06-16 23:08:12 +0300 |
| commit | 96500560f0c73c71bca1b27536c6254fa0e8ce37 (patch) | |
| tree | ed3e7df0aa513bc5a2395ce2680bbe444e09b2b6 /kernel/sched | |
| parent | cab3ecaed5cdcc9c36a96874b4c45056a46ece45 (diff) | |
| download | linux-96500560f0c73c71bca1b27536c6254fa0e8ce37.tar.xz | |
sched/core: Avoid double calling update_rq_clock() in __balance_push_cpu_stop()
There is a double update_rq_clock() invocation:
__balance_push_cpu_stop()
update_rq_clock()
__migrate_task()
update_rq_clock()
Sadly select_fallback_rq() also needs update_rq_clock() for
__do_set_cpus_allowed(), it is not possible to remove the update from
__balance_push_cpu_stop(). So remove it from __migrate_task() and
ensure all callers of this function call update_rq_clock() prior to
calling it.
Signed-off-by: Hao Jia <jiahao.os@bytedance.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lkml.kernel.org/r/20230613082012.49615-3-jiahao.os@bytedance.com
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/core.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 442efe59d188..c7db597e8175 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2546,7 +2546,6 @@ static struct rq *__migrate_task(struct rq *rq, struct rq_flags *rf, if (!is_cpu_allowed(p, dest_cpu)) return rq; - update_rq_clock(rq); rq = move_queued_task(rq, rf, p, dest_cpu); return rq; @@ -2604,10 +2603,12 @@ static int migration_cpu_stop(void *data) goto out; } - if (task_on_rq_queued(p)) + if (task_on_rq_queued(p)) { + update_rq_clock(rq); rq = __migrate_task(rq, &rf, p, arg->dest_cpu); - else + } else { p->wake_cpu = arg->dest_cpu; + } /* * XXX __migrate_task() can fail, at which point we might end |