linux-kernel - [tip: sched/core] sched/core: Refactor the task_flags check for worker sleeping in sched_submit

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Message-ID: <169555196768.27769.8331878851124889212.tip-bot2@tip-bot2>
Date:   Sun, 24 Sep 2023 10:39:27 -0000
From:   "tip-bot2 for Wang Jinchao" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Wang Jinchao <wangjinchao@...sion.com>,
        Ingo Molnar <mingo@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/core: Refactor the task_flags check for
 worker sleeping in sched_submit_work()

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     3eafe225995c67f8c179011ec2d6e4c12b32a53d
Gitweb:        https://git.kernel.org/tip/3eafe225995c67f8c179011ec2d6e4c12b32a53d
Author:        Wang Jinchao <wangjinchao@...sion.com>
AuthorDate:    Sun, 20 Aug 2023 20:53:17 +08:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Sun, 24 Sep 2023 12:15:06 +02:00

sched/core: Refactor the task_flags check for worker sleeping in sched_submit_work()

Simplify the conditional logic for checking worker flags
by splitting the original compound `if` statement into
separate `if` and `else if` clauses.

This modification not only retains the previous functionality,
but also reduces a single `if` check, improving code clarity
and potentially enhancing performance.

Signed-off-by: Wang Jinchao <wangjinchao@...sion.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Link: https://lore.kernel.org/r/ZOIMvURE99ZRAYEj@fedora
---
 kernel/sched/core.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 1074934..84881a5 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6711,12 +6711,10 @@ static inline void sched_submit_work(struct task_struct *tsk)
 	 * If a worker goes to sleep, notify and ask workqueue whether it
 	 * wants to wake up a task to maintain concurrency.
 	 */
-	if (task_flags & (PF_WQ_WORKER | PF_IO_WORKER)) {
-		if (task_flags & PF_WQ_WORKER)
-			wq_worker_sleeping(tsk);
-		else
-			io_wq_worker_sleeping(tsk);
-	}
+	if (task_flags & PF_WQ_WORKER)
+		wq_worker_sleeping(tsk);
+	else if (task_flags & PF_IO_WORKER)
+		io_wq_worker_sleeping(tsk);
 
 	/*
 	 * spinlock and rwlock must not flush block requests.  This will