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Commit 57e0be04 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by John Stultz
Browse files

sched: Make task->real_start_time nanoseconds based 



Simplify the only user of this data by removing the timespec
conversion.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
parent d560fed6

fs/proc/array.c

+1 −6
Original line number Diff line number Diff line
@@ -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);

include/linux/sched.h

+1 −1
Original line number Diff line number Diff line
@@ -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;

kernel/fork.c

+1 −2
Original line number Diff line number Diff line
@@ -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)