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taskstats: add e/u/stime for TGID command

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

[[email protected]: run ktime_get_ns() a single time]
[[email protected]: include linux/sched/cputime.h for task_cputime()]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Zhang Xiao <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Zhang Xiao authored and Linus Torvalds committed 2017-05-08 17:15:12 -07:00
1 parent eaa0d190bf
commit 8c733420bd
1 file changed
+14
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kernel/taskstats.c
+14
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@@ -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);