From: Haifeng Xu <haifeng.xu@shopee.com>
Date: Tue, 26 Sep 2023 11:57:22 +0000 (+0000)
Subject: sched/psi: Bail out early from irq time accounting
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=0c2924079f5a83ed715630680e338b3685a0bf7d;p=linux.git

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@shopee.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Chengming Zhou <zhouchengming@bytedance.com>
Link: https://lore.kernel.org/r/20230926115722.467833-1-haifeng.xu@shopee.com
---

diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c
index 44a78774ae875..519bc922a9600 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;