linux-kernel - [PATCH] sched: add uid information to sched_debug for CONFIG_USER

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Message-ID: <20081201112954.GH20329@linux.vnet.ibm.com>
Date:	Mon, 1 Dec 2008 16:59:54 +0530
From:	Arun R Bharadwaj <arun@...ux.vnet.ibm.com>
To:	mingo@...e.hu, a.p.zijlstra@...llo.nl
Cc:	linux-kernel@...r.kernel.org, vatsa@...ibm.com,
	bharata@...ux.vnet.ibm.com, dhaval@...ux.vnet.ibm.com,
	arun@...ux.vnet.ibm.com
Subject: [PATCH] sched: add uid information to sched_debug for
	CONFIG_USER_SCHED

Hi,

This patch adds uid information in sched_debug for CONFIG_USER_SCHED

Signed-off-by: Arun R Bharadwaj <arun@...ux.vnet.ibm.com>
---
 include/linux/sched.h |    1 +
 kernel/sched.c        |   10 ++++++++++
 kernel/sched_debug.c  |    5 +++++
 kernel/user.c         |    2 ++
 4 files changed, 18 insertions(+)

Index: git-2.6/kernel/sched_debug.c
===================================================================
--- git-2.6.orig/kernel/sched_debug.c
+++ git-2.6/kernel/sched_debug.c
@@ -131,6 +131,11 @@ void print_cfs_rq(struct seq_file *m, in
 		cgroup_path(cgroup, path, sizeof(path));
 
 	SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, path);
+#elif defined(CONFIG_USER_SCHED)
+	{
+		uid_t uid = cfs_rq->tg->uid;
+		SEQ_printf(m, "\ncfs_rq[%d] for UID: %u\n", cpu, uid);
+	}
 #else
 	SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu);
 #endif
Index: git-2.6/kernel/sched.c
===================================================================
--- git-2.6.orig/kernel/sched.c
+++ git-2.6/kernel/sched.c
@@ -261,6 +261,10 @@ struct task_group {
 	struct cgroup_subsys_state css;
 #endif
 
+#ifdef CONFIG_USER_SCHED
+	uid_t uid;
+#endif
+
 #ifdef CONFIG_FAIR_GROUP_SCHED
 	/* schedulable entities of this group on each cpu */
 	struct sched_entity **se;
@@ -286,6 +290,12 @@ struct task_group {
 
 #ifdef CONFIG_USER_SCHED
 
+/* Helper function to pass uid information to create_sched_user() */
+void set_tg_uid(struct user_struct *user)
+{
+	user->tg->uid = user->uid;
+}
+
 /*
  * Root task group.
  * 	Every UID task group (including init_task_group aka UID-0) will
Index: git-2.6/kernel/user.c
===================================================================
--- git-2.6.orig/kernel/user.c
+++ git-2.6/kernel/user.c
@@ -101,6 +101,8 @@ static int sched_create_user(struct user
 	if (IS_ERR(up->tg))
 		rc = -ENOMEM;
 
+	set_tg_uid(up);
+
 	return rc;
 }
 
Index: git-2.6/include/linux/sched.h
===================================================================
--- git-2.6.orig/include/linux/sched.h
+++ git-2.6/include/linux/sched.h
@@ -2220,6 +2220,7 @@ extern void normalize_rt_tasks(void);
 extern struct task_group init_task_group;
 #ifdef CONFIG_USER_SCHED
 extern struct task_group root_task_group;
+extern void set_tg_uid(struct user_struct *user);
 #endif
 
 extern struct task_group *sched_create_group(struct task_group *parent);
--
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