linux-kernel - [PATCH -tip 2/2] sched: Display autogroup names in /proc/sched

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Message-ID: <20110111101257.GF4772@in.ibm.com>
Date:	Tue, 11 Jan 2011 15:42:57 +0530
From:	Bharata B Rao <bharata@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>
Subject: [PATCH -tip 2/2] sched: Display autogroup names in /proc/sched_debug.

sched: Display autogroup names in /proc/sched_debug.

Add autogroup name to cfs_rq and tasks information in /proc/sched_debug.

Signed-off-by: Bharata B Rao <bharata@...ux.vnet.ibm.com>
---
 kernel/sched_autogroup.c |    5 +++++
 kernel/sched_debug.c     |    3 +++
 2 files changed, 8 insertions(+)

--- a/kernel/sched_autogroup.c
+++ b/kernel/sched_autogroup.c
@@ -231,6 +231,11 @@ void proc_sched_autogroup_show_task(stru
 #ifdef CONFIG_SCHED_DEBUG
 static inline int autogroup_path(struct task_group *tg, char *buf, int buflen)
 {
+	int enabled = ACCESS_ONCE(sysctl_sched_autogroup_enabled);
+
+	if (!enabled || !tg->autogroup)
+	       return 0;
+
 	return snprintf(buf, buflen, "%s-%ld", "/autogroup", tg->autogroup->id);
 }
 #endif /* CONFIG_SCHED_DEBUG */
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -93,6 +93,9 @@ static char group_path[PATH_MAX];
 
 static char * task_group_path(struct task_group *tg)
 {
+	if (autogroup_path(tg, group_path, PATH_MAX))
+		return group_path;
+
 	/*
 	 * May be NULL if the underlying cgroup isn't fully-created yet
 	 */
--
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