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| author | Matt Helsley <matthltc@us.ibm.com> | 2005-12-12 00:37:09 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-12-12 08:57:42 -0800 |
| commit | 64123fd42c7a1e4ebf6acd2399c98caddc7e0c26 (patch) | |
| tree | d6b1794fa33287d145a44ab55bc2e2ef65ebf248 /include | |
| parent | 894ec8707ced240b96dc45944790fb35d9a6b03c (diff) | |
| download | lwn-64123fd42c7a1e4ebf6acd2399c98caddc7e0c26.tar.gz lwn-64123fd42c7a1e4ebf6acd2399c98caddc7e0c26.zip | |
[PATCH] Add getnstimestamp function
There are several functions that might seem appropriate for a timestamp:
get_cycles()
current_kernel_time()
do_gettimeofday()
<read jiffies/jiffies_64>
Each has problems with combinations of SMP-safety, low resolution, and
monotonicity. This patch adds a new function that returns a monotonic SMP-safe
timestamp with nanosecond resolution where available.
Changes:
Split timestamp into separate patch
Moved to kernel/time.c
Renamed to getnstimestamp
Fixed unintended-pointer-arithmetic bug
Signed-off-by: Matt Helsley <matthltc@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/time.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/time.h b/include/linux/time.h index bfbe92d0767c..797ccd813bb0 100644 --- a/include/linux/time.h +++ b/include/linux/time.h @@ -95,6 +95,7 @@ struct itimerval; extern int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue); extern int do_getitimer(int which, struct itimerval *value); extern void getnstimeofday (struct timespec *tv); +extern void getnstimestamp(struct timespec *ts); extern struct timespec timespec_trunc(struct timespec t, unsigned gran); |