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Commit 8c733420 authored by Zhang Xiao's avatar Zhang Xiao Committed by Linus Torvalds
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taskstats: add e/u/stime for TGID command 

The elapsed time, user CPU time and system CPU time for the thread group
status request are presently left at zero.  Fill these in.

[akpm@linux-foundation.org: run ktime_get_ns() a single time]
[akpm@linux-foundation.org: include linux/sched/cputime.h for task_cputime()]
Link: http://lkml.kernel.org/r/1488508424-12322-1-git-send-email-xiao.zhang@windriver.com


Signed-off-by: default avatarZhang Xiao <xiao.zhang@windriver.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent eaa0d190

kernel/taskstats.c

+14 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ 
#include <linux/pid_namespace.h>

#include <net/genetlink.h>

#include <linux/atomic.h>

#include <linux/sched/cputime.h>



/*

 * Maximum length of a cpumask that can be specified in
@@ -210,6 +211,8 @@ 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;

	u64 start_time;



	/*

	 * Add additional stats from live tasks except zombie thread group
@@ -227,6 +230,7 @@ static int fill_stats_for_tgid(pid_t tgid, struct taskstats *stats) 
		memset(stats, 0, sizeof(*stats));



	tsk = first;

	start_time = ktime_get_ns();

	do {

		if (tsk->exit_state)

			continue;
@@ -238,6 +242,16 @@ static int fill_stats_for_tgid(pid_t tgid, struct taskstats *stats) 
		 */

		delayacct_add_tsk(stats, tsk);



		/* calculate task elapsed time in nsec */

		delta = start_time - 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);