Add elapsed time, user CPU time and system CPU time to
thread group status request.
Signed-off-by: Zhang Xiao <xiao.zh...@windriver.com>
---
kernel/taskstats.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index 8a5e442..802a2bb 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -210,6 +210,7 @@ static int fill_stats_for_tgid(pid_t tgid, struct taskstats
*stats)
struct task_struct *tsk, *first;
unsigned long flags;
int rc = -ESRCH;
+ u64 delta, utime, stime;
/*
* Add additional stats from live tasks except zombie thread group
@@ -238,6 +239,16 @@ static int fill_stats_for_tgid(pid_t tgid, struct
taskstats *stats)
*/
delayacct_add_tsk(stats, tsk);
+ /* calculate task elapsed time in nsec */
+ delta = ktime_get_ns() - tsk->start_time;
+ /* Convert to micro seconds */
+ do_div(delta, NSEC_PER_USEC);
+ stats->ac_etime += delta;
+
+ task_cputime(tsk, &utime, &stime);
+ stats->ac_utime += div_u64(utime, NSEC_PER_USEC);
+ stats->ac_stime += div_u64(stime, NSEC_PER_USEC);
+
stats->nvcsw += tsk->nvcsw;
stats->nivcsw += tsk->nivcsw;
} while_each_thread(first, tsk);
--
2.1.4
