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Diffstat (limited to 'include/linux/clocksource.h')
-rw-r--r--include/linux/clocksource.h15
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