linux-kernel - [tip:sched/core] sched: Fold updating of the last_update_time_info into update_ts_time

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Date:	Mon, 10 May 2010 05:53:27 GMT
From:	tip-bot for Arjan van de Ven <arjan@...ux.intel.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, arjan@...ux.intel.com, riel@...hat.com,
	akpm@...ux-foundation.org, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:sched/core] sched: Fold updating of the last_update_time_info into update_ts_time_stats()

Commit-ID:  8d63bf949e330588b80d30ca8f0a27a45297a9e9
Gitweb:     http://git.kernel.org/tip/8d63bf949e330588b80d30ca8f0a27a45297a9e9
Author:     Arjan van de Ven <arjan@...ux.intel.com>
AuthorDate: Sun, 9 May 2010 08:24:03 -0700
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sun, 9 May 2010 19:35:26 +0200

sched: Fold updating of the last_update_time_info into update_ts_time_stats()

This patch folds the updating of the last_update_time into the
update_ts_time_stats() function, and updates the callers.

This allows for further cleanups that are done in the next
patch.

Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Reviewed-by: Rik van Riel <riel@...hat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: davej@...hat.com
LKML-Reference: <20100509082403.60072967@...radead.org>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/time/tick-sched.c |   22 +++++++++++-----------
 1 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index f15d18d..e86e1c6 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -153,7 +153,8 @@ static void tick_nohz_update_jiffies(ktime_t now)
 /*
  * Updates the per cpu time idle statistics counters
  */
-static void update_ts_time_stats(struct tick_sched *ts, ktime_t now)
+static void
+update_ts_time_stats(struct tick_sched *ts, ktime_t now, u64 *last_update_time)
 {
 	ktime_t delta;
 
@@ -163,13 +164,19 @@ static void update_ts_time_stats(struct tick_sched *ts, ktime_t now)
 		ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta);
 		ts->idle_entrytime = now;
 	}
+
+	if (ts->idle_active && last_update_time)
+		*last_update_time = ktime_to_us(ts->idle_lastupdate);
+	else
+		*last_update_time = ktime_to_us(now);
+
 }
 
 static void tick_nohz_stop_idle(int cpu, ktime_t now)
 {
 	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
 
-	update_ts_time_stats(ts, now);
+	update_ts_time_stats(ts, now, NULL);
 	ts->idle_active = 0;
 
 	sched_clock_idle_wakeup_event(0);
@@ -181,7 +188,7 @@ static ktime_t tick_nohz_start_idle(struct tick_sched *ts)
 
 	now = ktime_get();
 
-	update_ts_time_stats(ts, now);
+	update_ts_time_stats(ts, now, NULL);
 
 	ts->idle_entrytime = now;
 	ts->idle_active = 1;
@@ -206,18 +213,11 @@ static ktime_t tick_nohz_start_idle(struct tick_sched *ts)
 u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time)
 {
 	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
-	ktime_t now;
 
 	if (!tick_nohz_enabled)
 		return -1;
 
-	now = ktime_get();
-	update_ts_time_stats(ts, now);
-
-	if (ts->idle_active)
-		*last_update_time = ktime_to_us(ts->idle_lastupdate);
-	else
-		*last_update_time = ktime_to_us(now);
+	update_ts_time_stats(ts, ktime_get(), last_update_time);
 
 	return ktime_to_us(ts->idle_sleeptime);
 }
--
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