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| author | Thomas Gleixner <tglx@linutronix.de> | 2015-04-14 21:08:49 +0000 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2015-04-22 17:06:50 +0200 |
| commit | 895bdfa793f6e912d1a58fc445b3dd4d686f7bd3 (patch) | |
| tree | df602d9bb8097eb9cd0bd6f98addc9b5f5cd333d /include/linux/hrtimer.h | |
| parent | b97f44c9b658d52e0139c947ea5519e51ba38d81 (diff) | |
| download | linux-895bdfa793f6e912d1a58fc445b3dd4d686f7bd3.tar.gz linux-895bdfa793f6e912d1a58fc445b3dd4d686f7bd3.tar.bz2 linux-895bdfa793f6e912d1a58fc445b3dd4d686f7bd3.zip | |
hrtimer: Keep pointer to first timer and simplify __remove_hrtimer()
__remove_hrtimer() needs to evaluate the expiry time to figure out
whether the timer which is removed is eventually the first expiring
timer on the cpu. Keep a pointer to it, which is lazily updated, so we
can avoid the evaluation dance and retrieve the information from there.
Generates slightly better code.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/20150414203501.752838019@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/hrtimer.h')
| -rw-r--r-- | include/linux/hrtimer.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h index e5c22d611850..d194c1dacdaa 100644 --- a/include/linux/hrtimer.h +++ b/include/linux/hrtimer.h @@ -172,6 +172,7 @@ enum hrtimer_base_type { * @clock_was_set_seq: Sequence counter of clock was set events * @expires_next: absolute time of the next event which was scheduled * via clock_set_next_event() + * @next_timer: Pointer to the first expiring timer * @in_hrtirq: hrtimer_interrupt() is currently executing * @hres_active: State of high resolution mode * @hang_detected: The last hrtimer interrupt detected a hang @@ -180,6 +181,10 @@ enum hrtimer_base_type { * @nr_hangs: Total number of hrtimer interrupt hangs * @max_hang_time: Maximum time spent in hrtimer_interrupt * @clock_base: array of clock bases for this cpu + * + * Note: next_timer is just an optimization for __remove_hrtimer(). + * Do not dereference the pointer because it is not reliable on + * cross cpu removals. */ struct hrtimer_cpu_base { raw_spinlock_t lock; @@ -191,6 +196,7 @@ struct hrtimer_cpu_base { hres_active : 1, hang_detected : 1; ktime_t expires_next; + struct hrtimer *next_timer; unsigned int nr_events; unsigned int nr_retries; unsigned int nr_hangs; |