diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/clocksource.h | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h index daa4940cc0f..2665ca04cf8 100644 --- a/include/linux/clocksource.h +++ b/include/linux/clocksource.h @@ -12,6 +12,7 @@ #include <linux/timex.h> #include <linux/time.h> #include <linux/list.h> +#include <linux/cache.h> #include <linux/timer.h> #include <asm/div64.h> #include <asm/io.h> @@ -52,6 +53,9 @@ struct clocksource; * @xtime_interval: Used internally by timekeeping core, please ignore. */ struct clocksource { + /* + * First part of structure is read mostly + */ char *name; struct list_head list; int rating; @@ -63,8 +67,15 @@ struct clocksource { cycle_t (*vread)(void); /* timekeeping specific data, ignore */ - cycle_t cycle_last, cycle_interval; - u64 xtime_nsec, xtime_interval; + cycle_t cycle_interval; + u64 xtime_interval; + /* + * Second part is written at each timer interrupt + * Keep it in a different cache line to dirty no + * more than one cache line. + */ + cycle_t cycle_last ____cacheline_aligned_in_smp; + u64 xtime_nsec; s64 error; #ifdef CONFIG_CLOCKSOURCE_WATCHDOG |