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authorArun R Bharadwaj <arun@linux.vnet.ibm.com>2009-04-16 12:13:26 +0530
committerThomas Gleixner <tglx@linutronix.de>2009-05-13 16:52:42 +0200
commit597d0275736dad9c3bda6f0a00a1c477dc0f37b1 (patch)
tree7ebbe9f80fb13a3ec34ea997d00c21eecf7699ae /include
parenta04198887658e1d8ae25f5420035c057cb170e67 (diff)
downloadop-kernel-dev-597d0275736dad9c3bda6f0a00a1c477dc0f37b1.zip
op-kernel-dev-597d0275736dad9c3bda6f0a00a1c477dc0f37b1.tar.gz
timers: Framework for identifying pinned timers
* Arun R Bharadwaj <arun@linux.vnet.ibm.com> [2009-04-16 12:11:36]: This patch creates a new framework for identifying cpu-pinned timers and hrtimers. This framework is needed because pinned timers are expected to fire on the same CPU on which they are queued. So it is essential to identify these and not migrate them, in case there are any. For regular timers, the currently existing add_timer_on() can be used queue pinned timers and subsequently mod_timer_pinned() can be used to modify the 'expires' field. For hrtimers, new modes HRTIMER_ABS_PINNED and HRTIMER_REL_PINNED are added to queue cpu-pinned hrtimer. [ tglx: use .._PINNED mode argument instead of creating tons of new functions ] Signed-off-by: Arun R Bharadwaj <arun@linux.vnet.ibm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include')
-rw-r--r--include/linux/hrtimer.h7
-rw-r--r--include/linux/timer.h3
2 files changed, 8 insertions, 2 deletions
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 0d2f7c8..7400900 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -30,8 +30,11 @@ struct hrtimer_cpu_base;
* Mode arguments of xxx_hrtimer functions:
*/
enum hrtimer_mode {
- HRTIMER_MODE_ABS, /* Time value is absolute */
- HRTIMER_MODE_REL, /* Time value is relative to now */
+ HRTIMER_MODE_ABS = 0x0, /* Time value is absolute */
+ HRTIMER_MODE_REL = 0x1, /* Time value is relative to now */
+ HRTIMER_MODE_PINNED = 0x02, /* Timer is bound to CPU */
+ HRTIMER_MODE_ABS_PINNED = 0x02,
+ HRTIMER_MODE_REL_PINNED = 0x03,
};
/*
diff --git a/include/linux/timer.h b/include/linux/timer.h
index 6cdb6f3..ccf882e 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -163,7 +163,10 @@ extern void add_timer_on(struct timer_list *timer, int cpu);
extern int del_timer(struct timer_list * timer);
extern int mod_timer(struct timer_list *timer, unsigned long expires);
extern int mod_timer_pending(struct timer_list *timer, unsigned long expires);
+extern int mod_timer_pinned(struct timer_list *timer, unsigned long expires);
+#define TIMER_NOT_PINNED 0
+#define TIMER_PINNED 1
/*
* The jiffies value which is added to now, when there is no timer
* in the timer wheel:
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