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| author | john stultz <johnstul@us.ibm.com> | 2007-07-25 05:38:34 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-25 21:17:44 +0400 |
| commit | 17c38b7490b3f0300c7812aefdae2ddda7ab4112 (patch) | |
| tree | 0f7a9ee0c691aef3497030e38c3ba8e3c13a985c /include/linux/time.h | |
| parent | 2c6b47de17c75d553de3e2fb426d8298d2074585 (diff) | |
| download | linux-17c38b7490b3f0300c7812aefdae2ddda7ab4112.tar.xz | |
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/linux/time.h')
| -rw-r--r-- | include/linux/time.h | 6 |
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); extern int no_sync_cmos_clock __read_mostly; void timekeeping_init(void); -static inline unsigned long get_seconds(void) -{ - return xtime.tv_sec; -} - +unsigned long get_seconds(void); struct timespec current_kernel_time(void); #define CURRENT_TIME (current_kernel_time()) |