linux-kernel - [PATCH] sched/psi: bail out early from irq time accounting

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Message-Id: <20230925102143.462545-1-haifeng.xu@shopee.com>
Date:   Mon, 25 Sep 2023 10:21:43 +0000
From:   Haifeng Xu <haifeng.xu@...pee.com>
To:     hannes@...xchg.org
Cc:     surenb@...gle.com, linux-kernel@...r.kernel.org,
        Haifeng Xu <haifeng.xu@...pee.com>
Subject: [PATCH] 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>
---
 kernel/sched/psi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c
index 81fca77397f6..e74e14762d49 100644
--- a/kernel/sched/psi.c
+++ b/kernel/sched/psi.c
@@ -1005,6 +1005,9 @@ 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;
 
-- 
2.25.1