diff options
| author | Justus Winter <4winter@informatik.uni-hamburg.de> | 2015-07-25 18:23:10 +0200 |
|---|---|---|
| committer | Justus Winter <4winter@informatik.uni-hamburg.de> | 2015-07-25 20:12:14 +0200 |
| commit | 3db15a3f80f193826e144b1944727a65c13340fe (patch) | |
| tree | f6eef1e163de6a5dccdc1067300c5fce333d722b /kern/thread.c | |
| parent | bb23879791cf015f17cb50b6443bac44b1cfbc72 (diff) | |
kern: add boot-time clock, use it for time stamps
The kernel keeps track of task and thread creation times by saving a
time stamp. Previously, the real-time clock was used for this. When
the real-time clock is changed, however, the reference frame for the
time stamps is lost. This surfaced in Hurd systems reporting
spuriously long uptimes.
Fix this by creating a boot-time clock and use it as reference frame
for the time stamps.
* kern/mach_clock.c (clock_boottime_offset): Create clock by keeping
track of the offset from the real-time.
(clock_boottime_update): New function.
(record_time_stamp): Use the boot-time clock for time stamps.
(read_time_stamp): New function to convert it back to real-time.
(host_set_time): Call `clock_boottime_update'.
* kern/mach_clock.h (record_time_stamp): Amend comment.
(read_time_stamp): New declaration.
* kern/task.c (task_info): Use `read_time_stamp'.
* kern/thread.c (thread_info): Likewise.
Diffstat (limited to 'kern/thread.c')
| -rw-r--r-- | kern/thread.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kern/thread.c b/kern/thread.c index 1f47553f..865a1cc4 100644 --- a/kern/thread.c +++ b/kern/thread.c @@ -1503,7 +1503,8 @@ kern_return_t thread_info( &basic_info->system_time); basic_info->base_priority = thread->priority; basic_info->cur_priority = thread->sched_pri; - basic_info->creation_time = thread->creation_time; + read_time_stamp(&thread->creation_time, + &basic_info->creation_time); /* * To calculate cpu_usage, first correct for timer rate, |