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| author | Thomas Gleixner <tglx@linutronix.de> | 2014-07-16 21:04:32 +0000 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2014-07-23 10:18:05 -0700 |
| commit | 57e0be041d9e21a7397eed3b67a7936ac4ac83c0 (patch) | |
| tree | 789396df941faa3b43bd61b27b675157a423070b | |
| parent | d560fed6abe0f9975b509e4fb824e08ac19adc93 (diff) | |
| download | linux-57e0be041d9e21a7397eed3b67a7936ac4ac83c0.tar.gz linux-57e0be041d9e21a7397eed3b67a7936ac4ac83c0.tar.bz2 linux-57e0be041d9e21a7397eed3b67a7936ac4ac83c0.zip | |
sched: Make task->real_start_time nanoseconds based
Simplify the only user of this data by removing the timespec
conversion.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
| -rw-r--r-- | fs/proc/array.c | 7 | ||||
| -rw-r--r-- | include/linux/sched.h | 2 | ||||
| -rw-r--r-- | kernel/fork.c | 3 |
3 files changed, 3 insertions, 9 deletions
diff --git a/fs/proc/array.c b/fs/proc/array.c index 64db2bceac59..d7f9199217bb 100644 --- a/fs/proc/array.c +++ b/fs/proc/array.c @@ -473,13 +473,8 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, priority = task_prio(task); nice = task_nice(task); - /* Temporary variable needed for gcc-2.96 */ - /* convert timespec -> nsec*/ - start_time = - (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC - + task->real_start_time.tv_nsec; /* convert nsec -> ticks */ - start_time = nsec_to_clock_t(start_time); + start_time = nsec_to_clock_t(task->real_start_time); seq_printf(m, "%d (%s) %c", pid_nr_ns(pid, ns), tcomm, state); seq_put_decimal_ll(m, ' ', ppid); diff --git a/include/linux/sched.h b/include/linux/sched.h index 306f4f0c987a..67678fa76f99 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1368,7 +1368,7 @@ struct task_struct { #endif unsigned long nvcsw, nivcsw; /* context switch counts */ struct timespec start_time; /* monotonic time */ - struct timespec real_start_time; /* boot based time */ + u64 real_start_time; /* boot based time in nsec */ /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ unsigned long min_flt, maj_flt; diff --git a/kernel/fork.c b/kernel/fork.c index 8f541930ce26..a7ab82db2f60 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1263,8 +1263,7 @@ static struct task_struct *copy_process(unsigned long clone_flags, posix_cpu_timers_init(p); ktime_get_ts(&p->start_time); - p->real_start_time = p->start_time; - monotonic_to_bootbased(&p->real_start_time); + p->real_start_time = ktime_get_boot_ns(); p->io_context = NULL; p->audit_context = NULL; if (clone_flags & CLONE_THREAD) |