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Subject[PATCH 6/8] taskstats: tell fill_threadgroup_stats() if it replies with PID or TGID stats
Date
fill_threadgroup_stats() may want to know if it is filling
TASKSTATS_CMD_ATTR_TGID or TASKSTATS_CMD_ATTR_PID stats, so give it this
information in the tg_stats boolean.

Signed-off-by: Guillaume Chazarain <guichaz@yahoo.fr>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Jay Lan <jlan@engr.sgi.com>
Cc: Jonathan Lim <jlim@sgi.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
---
include/linux/tsacct_kern.h | 4 ++--
kernel/taskstats.c | 11 ++++++-----
kernel/tsacct.c | 3 ++-
3 files changed, 10 insertions(+), 8 deletions(-)
diff --git a/include/linux/tsacct_kern.h b/include/linux/tsacct_kern.h
index 1568a3d..e8d1ad6 100644
--- a/include/linux/tsacct_kern.h
+++ b/include/linux/tsacct_kern.h
@@ -11,11 +11,11 @@

#ifdef CONFIG_TASKSTATS
void bacct_add_tsk(struct taskstats *stats, struct task_struct *task);
-void bacct_fill_threadgroup(struct taskstats *stats, struct task_struct *task);
+void bacct_fill_threadgroup(struct taskstats *stats, struct task_struct *task, bool tg_stats);
#else
static inline void bacct_add_tsk(struct taskstats *stats, struct task_struct *task)
{}
-static inline void bacct_fill_threadgroup(struct taskstats *stats, struct task_struct *task)
+static inline void bacct_fill_threadgroup(struct taskstats *stats, struct task_struct *task, bool tg_stats)
{}
#endif /* CONFIG_TASKSTATS */

diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index f25bf03..59fe1d8 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -204,12 +204,13 @@ static void add_tsk_stats(struct taskstats *stats, struct task_struct *task)
* fill_threadgroup_stats - initialize some common stats for the thread group
* @stats: the taskstats to write into
* @task: the thread representing the whole group
+ * @tg_stats: whether in the end thread group stats are requested
*
* Will be called on the thread group leader if requesting stats for the whole
* thread group.
*/
static void fill_threadgroup_stats(struct taskstats *stats,
- struct task_struct *task)
+ struct task_struct *task, bool tg_stats)
{
/*
* Each accounting subsystem adds calls to its functions to initialize
@@ -221,7 +222,7 @@ static void fill_threadgroup_stats(struct taskstats *stats,
stats->version = TASKSTATS_VERSION;

/* fill in basic acct fields */
- bacct_fill_threadgroup(stats, task);
+ bacct_fill_threadgroup(stats, task, tg_stats);

/* fill in extended acct fields */
xacct_fill_threadgroup(stats, task);
@@ -244,7 +245,7 @@ static int fill_pid(pid_t pid, struct task_struct *tsk, struct taskstats *stats)

memset(stats, 0, sizeof(*stats));
add_tsk_stats(stats, tsk);
- fill_threadgroup_stats(stats, tsk);
+ fill_threadgroup_stats(stats, tsk, false);

/* Define err: label here if needed */
put_task_struct(tsk);
@@ -285,7 +286,7 @@ static int fill_tgid(pid_t tgid, struct task_struct *first,
add_tsk_stats(stats, tsk);
} while_each_thread(first, tsk);

- fill_threadgroup_stats(stats, first->group_leader);
+ fill_threadgroup_stats(stats, first->group_leader, true);
unlock_task_sighand(first, &flags);
rc = 0;
out:
@@ -541,7 +542,7 @@ void taskstats_exit(struct task_struct *tsk, int group_dead)
*/

memcpy(stats, tsk->signal->stats, sizeof(*stats));
- fill_threadgroup_stats(stats, tsk->group_leader);
+ fill_threadgroup_stats(stats, tsk->group_leader, true);

send:
send_cpu_listeners(rep_skb, listeners);
diff --git a/kernel/tsacct.c b/kernel/tsacct.c
index 73b4c69..8c2f470 100644
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -62,7 +62,8 @@ void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
stats->nivcsw += tsk->nivcsw;
}

-void bacct_fill_threadgroup(struct taskstats *stats, struct task_struct *tsk)
+void bacct_fill_threadgroup(struct taskstats *stats, struct task_struct *tsk,
+ bool tg_stats)
{
fill_wall_times(stats, tsk);

-
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