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authorArjan van de Ven <arjan@linux.intel.com>2008-09-01 15:47:08 -0700
committerArjan van de Ven <arjan@linux.intel.com>2008-09-05 21:35:27 -0700
commit654c8e0b1c623b156c5b92f28d914ab38c9c2c90 (patch)
treeb3b1f8cfa8f3b12170f0d8b8770857182a2f0309 /include
parent799b64de256ea68fbb5db63bb55f61c305870643 (diff)
downloadlinux-654c8e0b1c623b156c5b92f28d914ab38c9c2c90.tar.gz
linux-654c8e0b1c623b156c5b92f28d914ab38c9c2c90.tar.xz
hrtimer: turn hrtimers into range timers
this patch turns hrtimers into range timers; they have 2 expire points 1) the soft expire point 2) the hard expire point the kernel will do it's regular best effort attempt to get the timer run at the hard expire point. However, if some other time fires after the soft expire point, the kernel now has the freedom to fire this timer at this point, and thus grouping the events and preventing a power-expensive wakeup in the future. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/hrtimer.h31
1 files changed, 30 insertions, 1 deletions
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 485a634fd6e2..28259c336679 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -112,6 +112,7 @@ enum hrtimer_cb_mode {
struct hrtimer {
struct rb_node node;
ktime_t _expires;
+ ktime_t _softexpires;
enum hrtimer_restart (*function)(struct hrtimer *);
struct hrtimer_clock_base *base;
unsigned long state;
@@ -220,20 +221,37 @@ static inline int hrtimer_is_hres_active(struct hrtimer *timer)
static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time)
{
timer->_expires = time;
+ timer->_softexpires = time;
}
+
+static inline void hrtimer_set_expires_range(struct hrtimer *timer, ktime_t time, ktime_t delta)
+{
+ timer->_softexpires = time;
+ timer->_expires = ktime_add_safe(time, delta);
+}
+
+static inline void hrtimer_set_expires_range_ns(struct hrtimer *timer, ktime_t time, unsigned long delta)
+{
+ timer->_softexpires = time;
+ timer->_expires = ktime_add_safe(time, ns_to_ktime(delta));
+}
+
static inline void hrtimer_set_expires_tv64(struct hrtimer *timer, s64 tv64)
{
timer->_expires.tv64 = tv64;
+ timer->_softexpires.tv64 = tv64;
}
static inline void hrtimer_add_expires(struct hrtimer *timer, ktime_t time)
{
timer->_expires = ktime_add_safe(timer->_expires, time);
+ timer->_softexpires = ktime_add_safe(timer->_softexpires, time);
}
static inline void hrtimer_add_expires_ns(struct hrtimer *timer, unsigned long ns)
{
timer->_expires = ktime_add_ns(timer->_expires, ns);
+ timer->_softexpires = ktime_add_ns(timer->_softexpires, ns);
}
static inline ktime_t hrtimer_get_expires(const struct hrtimer *timer)
@@ -241,10 +259,19 @@ static inline ktime_t hrtimer_get_expires(const struct hrtimer *timer)
return timer->_expires;
}
+static inline ktime_t hrtimer_get_softexpires(const struct hrtimer *timer)
+{
+ return timer->_softexpires;
+}
+
static inline s64 hrtimer_get_expires_tv64(const struct hrtimer *timer)
{
return timer->_expires.tv64;
}
+static inline s64 hrtimer_get_softexpires_tv64(const struct hrtimer *timer)
+{
+ return timer->_softexpires.tv64;
+}
static inline s64 hrtimer_get_expires_ns(const struct hrtimer *timer)
{
@@ -334,7 +361,7 @@ static inline int hrtimer_start_expires(struct hrtimer *timer,
static inline int hrtimer_restart(struct hrtimer *timer)
{
- return hrtimer_start(timer, timer->_expires, HRTIMER_MODE_ABS);
+ return hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
}
/* Query timers: */
@@ -391,6 +418,8 @@ extern long hrtimer_nanosleep_restart(struct restart_block *restart_block);
extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
struct task_struct *tsk);
+extern int schedule_hrtimeout_range(ktime_t *expires, unsigned long delta,
+ const enum hrtimer_mode mode);
extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode);
/* Soft interrupt function to run the hrtimer queues: */