[PATCH 27/32] nohz/cpuset: Flush cputimes on procfs stat file read

[Frederic Weisbecker]

When we read a process's procfs stat file, we need
to flush the cputimes of the tasks running in nohz
cpusets in case some childs in the thread group are
running there.

Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Anton Blanchard <anton@xxxxxxxxxxx>
Cc: Avi Kivity <avi@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
Cc: Paul E . McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Paul Menage <menage@xxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Stephen Hemminger <shemminger@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Tim Pepper <lnxninja@xxxxxxxxxxxxxxxxxx>
---
 fs/proc/array.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 9b45ee8..20e1c75 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -397,6 +397,8 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
 	cutime = cstime = utime = stime = cputime_zero;
 	cgtime = gtime = cputime_zero;
 
+	/* For thread group times */
+	cpuset_nohz_flush_cputimes();
 	if (lock_task_sighand(task, &flags)) {
 		struct signal_struct *sig = task->signal;
 
-- 
1.7.5.4

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