+ taskstats-add-e-u-stime-for-tgid-command-fix.patch added to -mm tree

+ taskstats-add-e-u-stime-for-tgid-command-fix.patch added to -mm tree

[akpm]

The patch titled
     Subject: taskstats-add-e-u-stime-for-tgid-command-fix
has been added to the -mm tree.  Its filename is
     taskstats-add-e-u-stime-for-tgid-command-fix.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/taskstats-add-e-u-stime-for-tgid-command-fix.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/taskstats-add-e-u-stime-for-tgid-command-fix.patch

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------------------------------------------------------
From: Andrew Morton <akpm@linux-foundation.org>
Subject: taskstats-add-e-u-stime-for-tgid-command-fix

run ktime_get_ns() a single time

Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Zhang Xiao <xiao.zhang@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/taskstats.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff -puN kernel/taskstats.c~taskstats-add-e-u-stime-for-tgid-command-fix kernel/taskstats.c
--- a/kernel/taskstats.c~taskstats-add-e-u-stime-for-tgid-command-fix
+++ a/kernel/taskstats.c
@@ -211,6 +211,7 @@ static int fill_stats_for_tgid(pid_t tgi
 	unsigned long flags;
 	int rc = -ESRCH;
 	u64 delta, utime, stime;
+	u64 start_time;
 
 	/*
 	 * Add additional stats from live tasks except zombie thread group
@@ -228,6 +229,7 @@ static int fill_stats_for_tgid(pid_t tgi
 		memset(stats, 0, sizeof(*stats));
 
 	tsk = first;
+	start_time = ktime_get_ns();
 	do {
 		if (tsk->exit_state)
 			continue;
@@ -240,7 +242,7 @@ static int fill_stats_for_tgid(pid_t tgi
 		delayacct_add_tsk(stats, tsk);
 
 		/* calculate task elapsed time in nsec */
-		delta = ktime_get_ns() - tsk->start_time;
+		delta = start_time - tsk->start_time;
 		/* Convert to micro seconds */
 		do_div(delta, NSEC_PER_USEC);
 		stats->ac_etime += delta;
_

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taskstats-add-e-u-stime-for-tgid-command-fix.patch
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