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Subject[tip:sched/core] sched: Introduce a function to update the idle statistics
Commit-ID:  595aac488b546c7185be7e29c8ae165a588b2a9f
Gitweb: http://git.kernel.org/tip/595aac488b546c7185be7e29c8ae165a588b2a9f
Author: Arjan van de Ven <arjan@linux.intel.com>
AuthorDate: Sun, 9 May 2010 08:22:45 -0700
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Sun, 9 May 2010 19:35:25 +0200

sched: Introduce a function to update the idle statistics

Currently, two places update the idle statistics (and more to
come later in this series).

This patch creates a helper function for updating these
statistics.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: davej@redhat.com
LKML-Reference: <20100509082245.163e67ed@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
kernel/time/tick-sched.c | 29 +++++++++++++++++++----------
1 files changed, 19 insertions(+), 10 deletions(-)

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 358822e..59d8762 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -150,14 +150,25 @@ static void tick_nohz_update_jiffies(ktime_t now)
touch_softlockup_watchdog();
}

-static void tick_nohz_stop_idle(int cpu, ktime_t now)
+/*
+ * Updates the per cpu time idle statistics counters
+ */
+static void update_ts_time_stats(struct tick_sched *ts, ktime_t now)
{
- struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
ktime_t delta;

- delta = ktime_sub(now, ts->idle_entrytime);
ts->idle_lastupdate = now;
- ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta);
+ if (ts->idle_active) {
+ delta = ktime_sub(now, ts->idle_entrytime);
+ ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta);
+ }
+}
+
+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);
ts->idle_active = 0;

sched_clock_idle_wakeup_event(0);
@@ -165,14 +176,12 @@ static void tick_nohz_stop_idle(int cpu, ktime_t now)

static ktime_t tick_nohz_start_idle(struct tick_sched *ts)
{
- ktime_t now, delta;
+ ktime_t now;

now = ktime_get();
- if (ts->idle_active) {
- delta = ktime_sub(now, ts->idle_entrytime);
- ts->idle_lastupdate = now;
- ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta);
- }
+
+ update_ts_time_stats(ts, now);
+
ts->idle_entrytime = now;
ts->idle_active = 1;
sched_clock_idle_sleep_event();

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