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Date: Mon, 07 Jan 2008 17:57:42 +0100
From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
To: vatsa@...ux.vnet.ibm.com
Cc: LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
Balbir Singh <balbir@...ux.vnet.ibm.com>,
dmitry.adamushko@...il.com, Steven Rostedt <rostedt@...dmis.org>,
Gregory Haskins <ghaskins@...ell.com>,
Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 12/11] sched: rt-group: uid-group interface
Subject: sched: rt-group: add uid-group interface
Extend the /sys/kernel/uids/<uid>/ interface to allow setting
the group's rt_period and rt_runtime.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
include/linux/sched.h | 4 +-
kernel/user.c | 93 +++++++++++++++++++++++++++++++++++++++++++-------
2 files changed, 84 insertions(+), 13 deletions(-)
Index: linux-2.6/include/linux/sched.h
===================================================================
--- linux-2.6.orig/include/linux/sched.h
+++ linux-2.6/include/linux/sched.h
@@ -559,7 +559,9 @@ struct user_struct {
struct task_group *tg;
#ifdef CONFIG_SYSFS
struct kset kset;
- struct subsys_attribute user_attr;
+ struct subsys_attribute share_attr;
+ struct subsys_attribute rt_period_attr;
+ struct subsys_attribute rt_runtime_attr;
struct work_struct work;
#endif
#endif
Index: linux-2.6/kernel/user.c
===================================================================
--- linux-2.6.orig/kernel/user.c
+++ linux-2.6/kernel/user.c
@@ -129,7 +129,7 @@ static inline void uids_mutex_unlock(voi
}
/* return cpu shares held by the user */
-static ssize_t cpu_shares_show(struct kset *kset, char *buffer)
+static ssize_t cpu_share_show(struct kset *kset, char *buffer)
{
struct user_struct *up = container_of(kset, struct user_struct, kset);
@@ -137,8 +137,8 @@ static ssize_t cpu_shares_show(struct ks
}
/* modify cpu shares held by the user */
-static ssize_t cpu_shares_store(struct kset *kset, const char *buffer,
- size_t size)
+static ssize_t cpu_share_store(struct kset *kset, const char *buffer,
+ size_t size)
{
struct user_struct *up = container_of(kset, struct user_struct, kset);
unsigned long shares;
@@ -151,12 +151,67 @@ static ssize_t cpu_shares_store(struct k
return (rc ? rc : size);
}
-static void user_attr_init(struct subsys_attribute *sa, char *name, int mode)
+static ssize_t cpu_rt_period_show(struct kset *kset, char *buffer)
{
- sa->attr.name = name;
- sa->attr.mode = mode;
- sa->show = cpu_shares_show;
- sa->store = cpu_shares_store;
+ struct user_struct *up = container_of(kset, struct user_struct, kset);
+
+ return sprintf(buffer, "%lu\n", sched_group_rt_period(up->tg));
+}
+
+static ssize_t cpu_rt_period_store(struct kset *kset, const char *buffer,
+ size_t size)
+{
+ struct user_struct *up = container_of(kset, struct user_struct, kset);
+ unsigned long rt_period_us;
+ int rc;
+
+ sscanf(buffer, "%lu", &rt_period_us);
+ rc = sched_group_set_rt_period(up->tg, rt_period_us);
+
+ return (rc ?: size);
+}
+
+static ssize_t cpu_rt_runtime_show(struct kset *kset, char *buffer)
+{
+ struct user_struct *up = container_of(kset, struct user_struct, kset);
+
+ return sprintf(buffer, "%lu\n", sched_group_rt_runtime(up->tg));
+}
+
+static ssize_t cpu_rt_runtime_store(struct kset *kset, const char *buffer,
+ size_t size)
+{
+ struct user_struct *up = container_of(kset, struct user_struct, kset);
+ unsigned long rt_runtime_us;
+ int rc;
+
+ sscanf(buffer, "%lu", &rt_runtime_us);
+ rc = sched_group_set_rt_runtime(up->tg, rt_runtime_us);
+
+ return (rc ?: size);
+}
+
+static void user_attr_init(struct user_struct *up)
+{
+ struct subsys_attribute *sa;
+
+ sa = &up->share_attr;
+ sa->attr.name = "cpu_share";
+ sa->attr.mode = 0644;
+ sa->show = cpu_share_show;
+ sa->store = cpu_share_store;
+
+ sa = &up->rt_period_attr;
+ sa->attr.name = "cpu_rt_period_us";
+ sa->attr.mode = 0644;
+ sa->show = cpu_rt_period_show;
+ sa->store = cpu_rt_period_store;
+
+ sa = &up->rt_runtime_attr;
+ sa->attr.name = "cpu_rt_runtime_us";
+ sa->attr.mode = 0644;
+ sa->show = cpu_rt_runtime_show;
+ sa->store = cpu_rt_runtime_store;
}
/* Create "/sys/kernel/uids/<uid>" directory and
@@ -172,15 +227,27 @@ static int user_kobject_create(struct us
kobj->parent = &uids_kobject; /* create under /sys/kernel/uids dir */
kobject_set_name(kobj, "%d", up->uid);
kset_init(kset);
- user_attr_init(&up->user_attr, "cpu_share", 0644);
+ user_attr_init(up);
error = kobject_add(kobj);
if (error)
goto done;
- error = sysfs_create_file(kobj, &up->user_attr.attr);
+ error = sysfs_create_file(kobj, &up->share_attr.attr);
+ if (error)
+ goto error1;
+ error = sysfs_create_file(kobj, &up->rt_period_attr.attr);
if (error)
- kobject_del(kobj);
+ goto error2;
+ error = sysfs_create_file(kobj, &up->rt_runtime_attr.attr);
+ if (error)
+ goto error3;
+
+ if (0) {
+error3: sysfs_remove_file(kobj, &up->rt_period_attr.attr);
+error2: sysfs_remove_file(kobj, &up->share_attr.attr);
+error1: kobject_del(kobj);
+ }
kobject_uevent(kobj, KOBJ_ADD);
@@ -238,7 +305,9 @@ static void remove_user_sysfs_dir(struct
if (!remove_user)
goto done;
- sysfs_remove_file(kobj, &up->user_attr.attr);
+ sysfs_remove_file(kobj, &up->share_attr.attr);
+ sysfs_remove_file(kobj, &up->rt_period_attr.attr);
+ sysfs_remove_file(kobj, &up->rt_runtime_attr.attr);
kobject_uevent(kobj, KOBJ_REMOVE);
kobject_del(kobj);
--
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