The patch titled
sched: introduce a function to update the idle statistics
has been added to the -mm tree. Its filename is
sched-introduce-a-function-to-update-the-idle-statistics.patch
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------------------------------------------------------
Subject: sched: introduce a function to update the idle statistics
From: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/time/tick-sched.c | 29 +++++++++++++++++++----------
1 file changed, 19 insertions(+), 10 deletions(-)
diff -puN kernel/time/tick-sched.c~sched-introduce-a-function-to-update-the-idle-statistics kernel/time/tick-sched.c
--- a/kernel/time/tick-sched.c~sched-introduce-a-function-to-update-the-idle-statistics
+++ a/kernel/time/tick-sched.c
@@ -150,14 +150,25 @@ static void tick_nohz_update_jiffies(kti
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,
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();
_
Patches currently in -mm which might be from arjan@xxxxxxxxxxxxxxx are
linux-next.patch
sched-add-a-comment-to-get_cpu_idle_time_us.patch
sched-introduce-a-function-to-update-the-idle-statistics.patch
sched-update-the-idle-statistics-in-get_cpu_idle_time_us.patch
sched-fold-updating-of-the-last-update-time-into-update_ts_time_stats.patch
sched-eliminate-the-ts-idle_lastupdate-field.patch
sched-introduce-get_cpu_iowait_time_us.patch
ondemand-solve-the-big-performance-issue-with-ondemand-during-disk-io.patch
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