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From: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
To: John Stultz <john.stultz@linaro.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Stephen Boyd <sboyd@kernel.org>
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH] timer: Use static_branch_likely() for timers_nohz_active
Date: Thu, 13 May 2021 14:33:54 +0800	[thread overview]
Message-ID: <20210513143354.096c6baf@xhacker.debian> (raw)

NOHZ is likely to be enabled, so use static_branch_likely() to
reflect this fact. This could improve the finally generated code
a bit for the most likely scenario, I.E save two "jmp" instructions.

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
---
 kernel/time/timer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index d111adf4a0cb..40d4fe7fa207 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -265,7 +265,7 @@ int timer_migration_handler(struct ctl_table *table, int write,
 
 static inline bool is_timers_nohz_active(void)
 {
-	return static_branch_unlikely(&timers_nohz_active);
+	return static_branch_likely(&timers_nohz_active);
 }
 #else
 static inline bool is_timers_nohz_active(void) { return false; }
-- 
2.31.0


             reply	other threads:[~2021-05-13  6:34 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-13  6:33 Jisheng Zhang [this message]
2021-06-22 15:19 ` [PATCH] timer: Use static_branch_likely() for timers_nohz_active Thomas Gleixner
2021-06-23  3:17   ` Jisheng Zhang
2021-06-23 10:41   ` Jisheng Zhang

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