sched/psi: Bail out early from irq time accounting

We could bail out early when psi was disabled.

Signed-off-by: Haifeng Xu <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Chengming Zhou <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: hfxsp

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;