Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Thu, 26 Feb 2009 21:40:16 +0100
Commit: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Thu, 26 Feb 2009 21:56:07 +0100
sched_clock: cleanups
- remove superfluous checks in __update_sched_clock()
- skip sched_clock_tick() for sched_clock_stable
- reinstate the simple !HAVE_UNSTABLE_SCHED_CLOCK code to please the bloatwatch
Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
kernel/sched_clock.c | 31 ++++++++++++++++++++-----------
1 files changed, 20 insertions(+), 11 deletions(-)
diff --git a/kernel/sched_clock.c b/kernel/sched_clock.c
index a755d02..390f332 100644
--- a/kernel/sched_clock.c
+++ b/kernel/sched_clock.c
@@ -44,9 +44,6 @@ static __read_mostly int sched_clock_running;
#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
__read_mostly int sched_clock_stable;
-#else
-static const int sched_clock_stable = 1;
-#endif
struct sched_clock_data {
/*
@@ -115,14 +112,9 @@ static u64 __update_sched_clock(struct sched_clock_data *scd, u64 now)
s64 delta = now - scd->tick_raw;
u64 clock, min_clock, max_clock;
- WARN_ON_ONCE(!irqs_disabled());
-
if (unlikely(delta < 0))
delta = 0;
- if (unlikely(!sched_clock_running))
- return 0ull;
-
/*
* scd->clock = clamp(scd->tick_gtod + delta,
* max(scd->tick_gtod, scd->clock),
@@ -201,18 +193,20 @@ u64 sched_clock_cpu(int cpu)
return clock;
}
-#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
-
void sched_clock_tick(void)
{
- struct sched_clock_data *scd = this_scd();
+ struct sched_clock_data *scd;
u64 now, now_gtod;
+ if (sched_clock_stable)
+ return;
+
if (unlikely(!sched_clock_running))
return;
WARN_ON_ONCE(!irqs_disabled());
+ scd = this_scd();
now_gtod = ktime_to_ns(ktime_get());
now = sched_clock();
@@ -245,6 +239,21 @@ void sched_clock_idle_wakeup_event(u64 delta_ns)
}
EXPORT_SYMBOL_GPL(sched_clock_idle_wakeup_event);
+#else /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
+
+void sched_clock_init(void)
+{
+ sched_clock_running = 1;
+}
+
+u64 sched_clock_cpu(int cpu)
+{
+ if (unlikely(!sched_clock_running))
+ return 0;
+
+ return sched_clock();
+}
+
#endif /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
unsigned long long cpu_clock(int cpu)
--
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