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[PATCH] hrtimers: optimize softirq runqueues

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The hrtimer softirq is called from the timer softirq every tick.  Retrieve the
current time from xtime and wall_to_monotonic instead of calling
base->get_time() for each timer base.  Store the time in the base structure
and provide a hook once clock source abstractions are in place and to keep the
code open for new base clocks.

Based on a patch from: Roman Zippel <zippel@linux-m68k.org>

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Thomas Gleixner
2006-03-26 01:38:05 -08:00
committed by Linus Torvalds
parent a0e9285233
commit 92127c7a45
2 changed files with 38 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
include/linux/hrtimer.h
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@@ -72,14 +72,16 @@ struct hrtimer {
/**
* struct hrtimer_base - the timer base for a specific clock
*
* @index: clock type index for per_cpu support when moving a timer
* to a base on another cpu.
* @lock: lock protecting the base and associated timers
* @active: red black tree root node for the active timers
* @first: pointer to the timer node which expires first
* @resolution: the resolution of the clock, in nanoseconds
* @get_time: function to retrieve the current time of the clock
* @curr_timer: the timer which is executing a callback right now
* @index: clock type index for per_cpu support when moving a timer
* to a base on another cpu.
* @lock: lock protecting the base and associated timers
* @active: red black tree root node for the active timers
* @first: pointer to the timer node which expires first
* @resolution: the resolution of the clock, in nanoseconds
* @get_time: function to retrieve the current time of the clock
* @get_sofirq_time: function to retrieve the current time from the softirq
* @curr_timer: the timer which is executing a callback right now
* @softirq_time: the time when running the hrtimer queue in the softirq
*/
struct hrtimer_base {
clockid_t index;
@@ -88,7 +90,9 @@ struct hrtimer_base {
struct rb_node *first;
ktime_t resolution;
ktime_t (*get_time)(void);
ktime_t (*get_softirq_time)(void);
struct hrtimer *curr_timer;
ktime_t softirq_time;
};
/*