[RFC][PATCH v2 3/7] taskstats: Add thread group ID to taskstats structure

[Michael Holzheu <holzheu@linux.vnet.ibm.com>]

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From: Michael Holzheu <holzheu@linux.vnet.ibm.com>

The tgid is important for aggregating threads in user space. Therefore we
add the tgid to the taskstats structure.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
---
 include/linux/taskstats.h |    1 +
 kernel/tsacct.c           |    1 +
 2 files changed, 2 insertions(+)

--- a/include/linux/taskstats.h
+++ b/include/linux/taskstats.h
@@ -167,6 +167,7 @@ struct taskstats {
 
 	/* Timestamp where data has been collected in ns since boot time */
 	__u64	time_ns;
+	__u32	ac_tgid;		/* Thread group ID */
 };
 
 
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -56,6 +56,7 @@ void bacct_add_tsk(struct taskstats *sta
 	stats->ac_nice	 = task_nice(tsk);
 	stats->ac_sched	 = tsk->policy;
 	stats->ac_pid	 = tsk->pid;
+	stats->ac_tgid	 = tsk->tgid;
 	rcu_read_lock();
 	tcred = __task_cred(tsk);
 	stats->ac_uid	 = tcred->uid;