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authorArjan van de Ven <arjan@linux.intel.com>2008-09-11 01:06:00 +0200
committerArjan van de Ven <arjan@linux.intel.com>2008-09-11 16:17:49 +0200
commit2e94d1f71f7e4404d997e6fb4f1618aa147d76f9 (patch)
tree73958a61dffff311cdcdc8edcb7e6a4953150601 /include
parenthrtimer: make the futex() system call use the per process slack value (diff)
downloadlinux-2e94d1f71f7e4404d997e6fb4f1618aa147d76f9.tar.xz
linux-2e94d1f71f7e4404d997e6fb4f1618aa147d76f9.zip
hrtimer: peek at the timer queue just before going idle
As part of going idle, we already look at the time of the next timer event to determine which C-state to select etc. This patch adds functionality that causes the timers that are past their soft expire time, to fire at this time, before we calculate the next wakeup time. This functionality will thus avoid wakeups by running timers before going idle rather than specially waking up for it. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/hrtimer.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 95db11f62ff2..d93b1e1dc169 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -326,6 +326,11 @@ static inline int hrtimer_is_hres_active(struct hrtimer *timer)
extern ktime_t ktime_get(void);
extern ktime_t ktime_get_real(void);
+
+DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
+extern void hrtimer_peek_ahead_timers(void);
+
+
/* Exported timer functions: */
/* Initialize timers: */