From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>, Peter Oskolkov <posk@posk.io>,
Tejun Heo <tj@kernel.org>, Jens Axboe <axboe@kernel.dk>
Subject: sched: Remove pointless preemption disable in sched_submit_work()
Date: Tue, 28 Sep 2021 16:30:26 +0200 [thread overview]
Message-ID: <87sfxoai2l.ffs@tglx> (raw)
Neither wq_worker_sleeping() nor io_wq_worker_sleeping() require to be invoked
with preemption disabled:
- The worker flag checks operations only need to be serialized against
the worker thread itself.
- The accounting and worker pool operations are serialized with locks.
which means that disabling preemption has neither a reason nor a
value. Remove it.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
kernel/sched/core.c | 2 --
1 file changed, 2 deletions(-)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6327,12 +6327,10 @@ static inline void sched_submit_work(str
* requires it.
*/
if (task_flags & (PF_WQ_WORKER | PF_IO_WORKER)) {
- preempt_disable();
if (task_flags & PF_WQ_WORKER)
wq_worker_sleeping(tsk);
else
io_wq_worker_sleeping(tsk);
- preempt_enable_no_resched();
}
if (tsk_is_pi_blocked(tsk))
next reply other threads:[~2021-09-28 14:30 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-28 14:30 Thomas Gleixner [this message]
2021-09-28 14:41 ` sched: Remove pointless preemption disable in sched_submit_work() Jens Axboe
2021-09-29 1:26 ` Lai Jiangshan
2021-09-29 9:37 ` [PATCH v2] " Thomas Gleixner
2021-10-01 15:05 ` [tip: sched/core] " tip-bot2 for Thomas Gleixner
2021-10-05 14:11 ` tip-bot2 for Thomas Gleixner
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