All the specific taskstats fields should only be manipulated in
{add_tsk,fill_threadgroup}_stats().

Signed-off-by: Guillaume Chazarain
Cc: Balbir Singh
Cc: Jay Lan
Cc: Jonathan Lim
Cc: Oleg Nesterov
---

kernel/taskstats.c | 21 ++++++++-------------
kernel/tsacct.c | 3 +++
2 files changed, 11 insertions(+), 13 deletions(-)

diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index 972bbfa..f25bf03 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -218,6 +218,8 @@ static void fill_threadgroup_stats(struct taskstats *stats,
* per-task-foo-fill_threadgroup(stats, task);
*/

+ stats->version = TASKSTATS_VERSION;
+
/* fill in basic acct fields */
bacct_fill_threadgroup(stats, task);

@@ -241,9 +243,6 @@ static int fill_pid(pid_t pid, struct task_struct *tsk, struct taskstats *stats)
get_task_struct(tsk);

memset(stats, 0, sizeof(*stats));
- stats->version = TASKSTATS_VERSION;
- stats->nvcsw = tsk->nvcsw;
- stats->nivcsw = tsk->nivcsw;
add_tsk_stats(stats, tsk);
fill_threadgroup_stats(stats, tsk);

@@ -278,15 +277,12 @@ static int fill_tgid(pid_t tgid, struct task_struct *first,

tsk = first;
do {
- if (tsk->exit_state)
- continue;
- /*
- * This check is racy as a thread could exit just right
- * now and have its statistics accounted twice.
- */
- add_tsk_stats(stats, tsk);
- stats->nvcsw += tsk->nvcsw;
- stats->nivcsw += tsk->nivcsw;
+ if (!tsk->exit_state)
+ /*
+ * This check is racy as a thread could exit just right
+ * now and have its statistics accounted twice.
+ */
+ add_tsk_stats(stats, tsk);
} while_each_thread(first, tsk);

fill_threadgroup_stats(stats, first->group_leader);
@@ -294,7 +290,6 @@ static int fill_tgid(pid_t tgid, struct task_struct *first,
rc = 0;
out:
rcu_read_unlock();
- stats->version = TASKSTATS_VERSION;
return rc;
}

diff --git a/kernel/tsacct.c b/kernel/tsacct.c
index 4caea73..73b4c69 100644
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -57,6 +57,9 @@ void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
cputime_to_msecs(tsk->stimescaled) * USEC_PER_MSEC;
stats->ac_minflt += tsk->min_flt;
stats->ac_majflt += tsk->maj_flt;
+
+ stats->nvcsw += tsk->nvcsw;
+ stats->nivcsw += tsk->nivcsw;
}

void bacct_fill_threadgroup(struct taskstats *stats, struct task_struct *tsk)
-
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