linux-kernel - [tip: sched/core] sched/psi: Bail out early from irq time accounting

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Date:   Fri, 13 Oct 2023 08:06:12 -0000
From:   "tip-bot2 for Haifeng Xu" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Haifeng Xu <haifeng.xu@...pee.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Chengming Zhou <zhouchengming@...edance.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/psi: Bail out early from irq time accounting

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

Commit-ID:     0c2924079f5a83ed715630680e338b3685a0bf7d
Gitweb:        https://git.kernel.org/tip/0c2924079f5a83ed715630680e338b3685a0bf7d
Author:        Haifeng Xu <haifeng.xu@...pee.com>
AuthorDate:    Tue, 26 Sep 2023 11:57:22 
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Fri, 13 Oct 2023 09:56:29 +02:00

sched/psi: Bail out early from irq time accounting

We could bail out early when psi was disabled.

Signed-off-by: Haifeng Xu <haifeng.xu@...pee.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Chengming Zhou <zhouchengming@...edance.com>
Link: https://lore.kernel.org/r/20230926115722.467833-1-haifeng.xu@shopee.com
---
 kernel/sched/psi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c
index 44a7877..519bc92 100644
--- a/kernel/sched/psi.c
+++ b/kernel/sched/psi.c
@@ -998,6 +998,9 @@ void psi_account_irqtime(struct task_struct *task, u32 delta)
 	struct psi_group_cpu *groupc;
 	u64 now;
 
+	if (static_branch_likely(&psi_disabled))
+		return;
+
 	if (!task->pid)
 		return;