linux-kernel - [PATCH 2/7] cpufreq: intel_pstate: Avoid duplicate call of intel_pstate_get_scaled

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Message-ID: <53962067.4060504@semaphore.gr>
Date:	Tue, 10 Jun 2014 00:00:23 +0300
From:	Stratos Karafotis <stratosk@...aphore.gr>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Dirk Brandewie <dirk.j.brandewie@...el.com>
CC:	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/7] cpufreq: intel_pstate: Avoid duplicate call of intel_pstate_get_scaled_busy

Store busy_scaled value to avoid to duplicate call of
intel_pstate_get_scaled_busy on every sampling interval.

Also, rename the function to intel_pstate_calc_scaled_busy.

Signed-off-by: Stratos Karafotis <stratosk@...aphore.gr>
---
 drivers/cpufreq/intel_pstate.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 4e7f492..31e2ae5 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -55,6 +55,7 @@ static inline int32_t div_fp(int32_t x, int32_t y)
 
 struct sample {
 	int32_t core_pct_busy;
+	int32_t busy_scaled;
 	u64 aperf;
 	u64 mperf;
 	int freq;
@@ -604,7 +605,7 @@ static inline void intel_pstate_set_sample_time(struct cpudata *cpu)
 	mod_timer_pinned(&cpu->timer, jiffies + delay);
 }
 
-static inline int32_t intel_pstate_get_scaled_busy(struct cpudata *cpu)
+static inline void intel_pstate_calc_scaled_busy(struct cpudata *cpu)
 {
 	int32_t core_busy, max_pstate, current_pstate, sample_ratio;
 	u32 duration_us;
@@ -624,20 +625,19 @@ static inline int32_t intel_pstate_get_scaled_busy(struct cpudata *cpu)
 		core_busy = mul_fp(core_busy, sample_ratio);
 	}
 
-	return core_busy;
+	cpu->sample.busy_scaled = core_busy;
 }
 
 static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu)
 {
-	int32_t busy_scaled;
 	struct _pid *pid;
 	signed int ctl = 0;
 	int steps;
 
 	pid = &cpu->pid;
-	busy_scaled = intel_pstate_get_scaled_busy(cpu);
+	intel_pstate_calc_scaled_busy(cpu);
 
-	ctl = pid_calc(pid, busy_scaled);
+	ctl = pid_calc(pid, cpu->sample.busy_scaled);
 
 	steps = abs(ctl);
 
@@ -659,7 +659,7 @@ static void intel_pstate_timer_func(unsigned long __data)
 	intel_pstate_adjust_busy_pstate(cpu);
 
 	trace_pstate_sample(fp_toint(sample->core_pct_busy),
-			fp_toint(intel_pstate_get_scaled_busy(cpu)),
+			fp_toint(sample->busy_scaled),
 			cpu->pstate.current_pstate,
 			sample->mperf,
 			sample->aperf,
-- 
1.9.3
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