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authorjohn stultz <johnstul@us.ibm.com>2007-07-24 21:38:34 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-25 13:17:44 -0400
commit17c38b7490b3f0300c7812aefdae2ddda7ab4112 (patch)
tree0f7a9ee0c691aef3497030e38c3ba8e3c13a985c /include
parent2c6b47de17c75d553de3e2fb426d8298d2074585 (diff)
Cache xtime every call to update_wall_time
This avoids xtime lag seen with dynticks, because while 'xtime' itself is still not updated often, we keep a 'xtime_cache' variable around that contains the approximate real-time that _is_ updated each time we do a 'update_wall_time()', and is thus never off by more than one tick. IOW, this restores the original semantics for 'xtime' users, as long as you use the proper abstraction functions (ie 'current_kernel_time()' or 'get_seconds()' depending on whether you want a timespec or just the seconds field). [ Updated Patch. As penance for my sins I've also yanked another #ifdef that was added to avoid the xtime lag w/ hrtimers. ] Signed-off-by: John Stultz <johnstul@us.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/time.h6
1 files changed, 1 insertions, 5 deletions
diff --git a/include/linux/time.h b/include/linux/time.h
index 71181df8b744..6a5f503b4f1d 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -99,11 +99,7 @@ extern int update_persistent_clock(struct timespec now);
99extern int no_sync_cmos_clock __read_mostly; 99extern int no_sync_cmos_clock __read_mostly;
100void timekeeping_init(void); 100void timekeeping_init(void);
101 101
102static inline unsigned long get_seconds(void) 102unsigned long get_seconds(void);
103{
104 return xtime.tv_sec;
105}
106
107struct timespec current_kernel_time(void); 103struct timespec current_kernel_time(void);
108 104
109#define CURRENT_TIME (current_kernel_time()) 105#define CURRENT_TIME (current_kernel_time())