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| author | Thomas Gleixner <tglx@linutronix.de> | 2011-05-20 16:18:50 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2011-05-23 13:59:53 +0200 |
| commit | 9ec2690758a5467f24beb301cca5098078073bba (patch) | |
| tree | e5bc78f690d12635a56460ea6f54b49318221dc8 /include | |
| parent | 250f972d85effad5b6e10da4bbd877e6a4b503b6 (diff) | |
| download | linux-3.10-9ec2690758a5467f24beb301cca5098078073bba.tar.gz linux-3.10-9ec2690758a5467f24beb301cca5098078073bba.tar.bz2 linux-3.10-9ec2690758a5467f24beb301cca5098078073bba.zip | |
timerfd: Manage cancelable timers in timerfd
Peter is concerned about the extra scan of CLOCK_REALTIME_COS in the
timer interrupt. Yes, I did not think about it, because the solution
was so elegant. I didn't like the extra list in timerfd when it was
proposed some time ago, but with a rcu based list the list walk it's
less horrible than the original global lock, which was held over the
list iteration.
Requested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Peter Zijlstra <peterz@infradead.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/hrtimer.h | 6 | ||||
| -rw-r--r-- | include/linux/time.h | 6 | ||||
| -rw-r--r-- | include/linux/timerfd.h | 4 |
3 files changed, 7 insertions, 9 deletions
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h index eda4ccde073..925c8c01db7 100644 --- a/include/linux/hrtimer.h +++ b/include/linux/hrtimer.h @@ -155,7 +155,6 @@ enum hrtimer_base_type { HRTIMER_BASE_REALTIME, HRTIMER_BASE_MONOTONIC, HRTIMER_BASE_BOOTTIME, - HRTIMER_BASE_REALTIME_COS, HRTIMER_MAX_CLOCK_BASES, }; @@ -306,6 +305,11 @@ static inline int hrtimer_is_hres_active(struct hrtimer *timer) #endif extern void clock_was_set(void); +#ifdef CONFIG_TIMERFD +extern void timerfd_clock_was_set(void); +#else +static inline void timerfd_clock_was_set(void) { } +#endif extern void hrtimers_resume(void); extern ktime_t ktime_get(void); diff --git a/include/linux/time.h b/include/linux/time.h index a9242773eb2..b3061782dec 100644 --- a/include/linux/time.h +++ b/include/linux/time.h @@ -302,12 +302,6 @@ struct itimerval { * The IDs of various hardware clocks: */ #define CLOCK_SGI_CYCLE 10 - -#ifdef __KERNEL__ -/* This clock is not exposed to user space */ -#define CLOCK_REALTIME_COS 15 -#endif - #define MAX_CLOCKS 16 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) #define CLOCKS_MONO CLOCK_MONOTONIC diff --git a/include/linux/timerfd.h b/include/linux/timerfd.h index e9571fc8f1a..d3b57fa1222 100644 --- a/include/linux/timerfd.h +++ b/include/linux/timerfd.h @@ -19,7 +19,7 @@ * shared O_* flags. */ #define TFD_TIMER_ABSTIME (1 << 0) -#define TFD_TIMER_CANCELON_SET (1 << 1) +#define TFD_TIMER_CANCEL_ON_SET (1 << 1) #define TFD_CLOEXEC O_CLOEXEC #define TFD_NONBLOCK O_NONBLOCK @@ -27,6 +27,6 @@ /* Flags for timerfd_create. */ #define TFD_CREATE_FLAGS TFD_SHARED_FCNTL_FLAGS /* Flags for timerfd_settime. */ -#define TFD_SETTIME_FLAGS (TFD_TIMER_ABSTIME | TFD_TIMER_CANCELON_SET) +#define TFD_SETTIME_FLAGS (TFD_TIMER_ABSTIME | TFD_TIMER_CANCEL_ON_SET) #endif /* _LINUX_TIMERFD_H */ |