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

Frederic Weisbecker
2011-08-15T15:54:15Z

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@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Anton Blanchard <anton@au1.ibm.com>
Cc: Avi Kivity <avi@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Paul E . McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul Menage <menage@google.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephen Hemminger <shemminger@vyatta.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tim Pepper <lnxninja@linux.vnet.ibm.com>
---
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