linux-kernel - [RFC PATCH 6/9] sched/fair: Add __always_inline compiler attribute to __accumulate

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Message-Id: <1463338774-3324-7-git-send-email-yuyang.du@intel.com>
Date:	Mon, 16 May 2016 02:59:31 +0800
From:	Yuyang Du <yuyang.du@...el.com>
To:	peterz@...radead.org, mingo@...nel.org,
	linux-kernel@...r.kernel.org
Cc:	bsegall@...gle.com, pjt@...gle.com, morten.rasmussen@....com,
	vincent.guittot@...aro.org, dietmar.eggemann@....com,
	juri.lelli@....com, Yuyang Du <yuyang.du@...el.com>
Subject: [RFC PATCH 6/9] sched/fair: Add __always_inline compiler attribute to __accumulate_sum()

__accumulate_sum()'s caller and sibling functions are all inlined.
And it will be called almost every time in its caller. It does not
make sense if only it is not inlined.

Signed-off-by: Yuyang Du <yuyang.du@...el.com>
---
 kernel/sched/fair.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 1fac2bf..1bbac7e 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2652,7 +2652,7 @@ static __always_inline u64 __decay_sum(u64 val, u32 n)
  * We can compute this efficiently by combining:
  * y^32 = 1/2 with precomputed \Sum 1024*y^n   (where n < 32)
  */
-static u32 __accumulate_sum(u32 n)
+static __always_inline u32 __accumulate_sum(u32 n)
 {
 	u32 contrib = 0;
 
-- 
1.7.9.5