Merge git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched
* git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched:
sched: rt-group: refure unrunnable tasks
sched: rt-group: clean up the ifdeffery
sched: rt-group: make rt groups scheduling configurable
sched: rt-group: interface
sched: rt-group: deal with PI
sched: fix incorrect irq lock usage in normalize_rt_tasks()
sched: fair-group: separate tg->shares from task_group_lock
hrtimer: more hrtimer_init_sleeper() fallout.
diff --git a/Documentation/sched-rt-group.txt b/Documentation/sched-rt-group.txt
new file mode 100644
index 0000000..1c6332f
--- /dev/null
+++ b/Documentation/sched-rt-group.txt
@@ -0,0 +1,59 @@
+
+
+Real-Time group scheduling.
+
+The problem space:
+
+In order to schedule multiple groups of realtime tasks each group must
+be assigned a fixed portion of the CPU time available. Without a minimum
+guarantee a realtime group can obviously fall short. A fuzzy upper limit
+is of no use since it cannot be relied upon. Which leaves us with just
+the single fixed portion.
+
+CPU time is divided by means of specifying how much time can be spent
+running in a given period. Say a frame fixed realtime renderer must
+deliver 25 frames a second, which yields a period of 0.04s. Now say
+it will also have to play some music and respond to input, leaving it
+with around 80% for the graphics. We can then give this group a runtime
+of 0.8 * 0.04s = 0.032s.
+
+This way the graphics group will have a 0.04s period with a 0.032s runtime
+limit.
+
+Now if the audio thread needs to refill the DMA buffer every 0.005s, but
+needs only about 3% CPU time to do so, it can do with a 0.03 * 0.005s
+= 0.00015s.
+
+
+The Interface:
+
+system wide:
+
+/proc/sys/kernel/sched_rt_period_ms
+/proc/sys/kernel/sched_rt_runtime_us
+
+CONFIG_FAIR_USER_SCHED
+
+/sys/kernel/uids/<uid>/cpu_rt_runtime_us
+
+or
+
+CONFIG_FAIR_CGROUP_SCHED
+
+/cgroup/<cgroup>/cpu.rt_runtime_us
+
+[ time is specified in us because the interface is s32; this gives an
+ operating range of ~35m to 1us ]
+
+The period takes values in [ 1, INT_MAX ], runtime in [ -1, INT_MAX - 1 ].
+
+A runtime of -1 specifies runtime == period, ie. no limit.
+
+New groups get the period from /proc/sys/kernel/sched_rt_period_us and
+a runtime of 0.
+
+Settings are constrained to:
+
+ \Sum_{i} runtime_{i} / global_period <= global_runtime / global_period
+
+in order to keep the configuration schedulable.
diff --git a/include/linux/cgroup_subsys.h b/include/linux/cgroup_subsys.h
index 228235c..ac6aad9 100644
--- a/include/linux/cgroup_subsys.h
+++ b/include/linux/cgroup_subsys.h
@@ -25,7 +25,7 @@
/* */
-#ifdef CONFIG_FAIR_CGROUP_SCHED
+#ifdef CONFIG_CGROUP_SCHED
SUBSYS(cpu_cgroup)
#endif
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 00e1441..b9bb313 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -590,7 +590,7 @@
struct hlist_node uidhash_node;
uid_t uid;
-#ifdef CONFIG_FAIR_USER_SCHED
+#ifdef CONFIG_USER_SCHED
struct task_group *tg;
#ifdef CONFIG_SYSFS
struct kobject kobj;
@@ -973,7 +973,7 @@
unsigned long timeout;
int nr_cpus_allowed;
-#ifdef CONFIG_FAIR_GROUP_SCHED
+#ifdef CONFIG_RT_GROUP_SCHED
struct sched_rt_entity *parent;
/* rq on which this entity is (to be) queued: */
struct rt_rq *rt_rq;
@@ -1541,8 +1541,6 @@
extern unsigned int sysctl_sched_features;
extern unsigned int sysctl_sched_migration_cost;
extern unsigned int sysctl_sched_nr_migrate;
-extern unsigned int sysctl_sched_rt_period;
-extern unsigned int sysctl_sched_rt_ratio;
#if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
extern unsigned int sysctl_sched_min_bal_int_shares;
extern unsigned int sysctl_sched_max_bal_int_shares;
@@ -1552,6 +1550,8 @@
struct file *file, void __user *buffer, size_t *length,
loff_t *ppos);
#endif
+extern unsigned int sysctl_sched_rt_period;
+extern int sysctl_sched_rt_runtime;
extern unsigned int sysctl_sched_compat_yield;
@@ -2027,16 +2027,22 @@
extern void normalize_rt_tasks(void);
-#ifdef CONFIG_FAIR_GROUP_SCHED
+#ifdef CONFIG_GROUP_SCHED
extern struct task_group init_task_group;
extern struct task_group *sched_create_group(void);
extern void sched_destroy_group(struct task_group *tg);
extern void sched_move_task(struct task_struct *tsk);
+#ifdef CONFIG_FAIR_GROUP_SCHED
extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
extern unsigned long sched_group_shares(struct task_group *tg);
-
+#endif
+#ifdef CONFIG_RT_GROUP_SCHED
+extern int sched_group_set_rt_runtime(struct task_group *tg,
+ long rt_runtime_us);
+extern long sched_group_rt_runtime(struct task_group *tg);
+#endif
#endif
#ifdef CONFIG_TASK_XACCT
diff --git a/init/Kconfig b/init/Kconfig
index 824d48c..dcef8b5 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -311,25 +311,36 @@
Say N if unsure.
-config FAIR_GROUP_SCHED
- bool "Fair group CPU scheduler"
+config GROUP_SCHED
+ bool "Group CPU scheduler"
default y
help
This feature lets CPU scheduler recognize task groups and control CPU
bandwidth allocation to such task groups.
-choice
- depends on FAIR_GROUP_SCHED
- prompt "Basis for grouping tasks"
- default FAIR_USER_SCHED
+config FAIR_GROUP_SCHED
+ bool "Group scheduling for SCHED_OTHER"
+ depends on GROUP_SCHED
+ default y
-config FAIR_USER_SCHED
+config RT_GROUP_SCHED
+ bool "Group scheduling for SCHED_RR/FIFO"
+ depends on EXPERIMENTAL
+ depends on GROUP_SCHED
+ default n
+
+choice
+ depends on GROUP_SCHED
+ prompt "Basis for grouping tasks"
+ default USER_SCHED
+
+config USER_SCHED
bool "user id"
help
This option will choose userid as the basis for grouping
tasks, thus providing equal CPU bandwidth to each user.
-config FAIR_CGROUP_SCHED
+config CGROUP_SCHED
bool "Control groups"
depends on CGROUPS
help
diff --git a/kernel/rtmutex.c b/kernel/rtmutex.c
index 0deef71..6522ae5 100644
--- a/kernel/rtmutex.c
+++ b/kernel/rtmutex.c
@@ -630,9 +630,12 @@
set_current_state(state);
/* Setup the timer, when timeout != NULL */
- if (unlikely(timeout))
+ if (unlikely(timeout)) {
hrtimer_start(&timeout->timer, timeout->timer.expires,
HRTIMER_MODE_ABS);
+ if (!hrtimer_active(&timeout->timer))
+ timeout->task = NULL;
+ }
for (;;) {
/* Try to acquire the lock: */
diff --git a/kernel/sched.c b/kernel/sched.c
index 3eedd52..f28f19e 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -155,7 +155,7 @@
struct list_head queue[MAX_RT_PRIO];
};
-#ifdef CONFIG_FAIR_GROUP_SCHED
+#ifdef CONFIG_GROUP_SCHED
#include <linux/cgroup.h>
@@ -165,19 +165,16 @@
/* task group related information */
struct task_group {
-#ifdef CONFIG_FAIR_CGROUP_SCHED
+#ifdef CONFIG_CGROUP_SCHED
struct cgroup_subsys_state css;
#endif
+
+#ifdef CONFIG_FAIR_GROUP_SCHED
/* schedulable entities of this group on each cpu */
struct sched_entity **se;
/* runqueue "owned" by this group on each cpu */
struct cfs_rq **cfs_rq;
- struct sched_rt_entity **rt_se;
- struct rt_rq **rt_rq;
-
- unsigned int rt_ratio;
-
/*
* shares assigned to a task group governs how much of cpu bandwidth
* is allocated to the group. The more shares a group has, the more is
@@ -213,33 +210,46 @@
*
*/
unsigned long shares;
+#endif
+
+#ifdef CONFIG_RT_GROUP_SCHED
+ struct sched_rt_entity **rt_se;
+ struct rt_rq **rt_rq;
+
+ u64 rt_runtime;
+#endif
struct rcu_head rcu;
struct list_head list;
};
+#ifdef CONFIG_FAIR_GROUP_SCHED
/* Default task group's sched entity on each cpu */
static DEFINE_PER_CPU(struct sched_entity, init_sched_entity);
/* Default task group's cfs_rq on each cpu */
static DEFINE_PER_CPU(struct cfs_rq, init_cfs_rq) ____cacheline_aligned_in_smp;
+static struct sched_entity *init_sched_entity_p[NR_CPUS];
+static struct cfs_rq *init_cfs_rq_p[NR_CPUS];
+#endif
+
+#ifdef CONFIG_RT_GROUP_SCHED
static DEFINE_PER_CPU(struct sched_rt_entity, init_sched_rt_entity);
static DEFINE_PER_CPU(struct rt_rq, init_rt_rq) ____cacheline_aligned_in_smp;
-static struct sched_entity *init_sched_entity_p[NR_CPUS];
-static struct cfs_rq *init_cfs_rq_p[NR_CPUS];
-
static struct sched_rt_entity *init_sched_rt_entity_p[NR_CPUS];
static struct rt_rq *init_rt_rq_p[NR_CPUS];
+#endif
-/* task_group_mutex serializes add/remove of task groups and also changes to
+/* task_group_lock serializes add/remove of task groups and also changes to
* a task group's cpu shares.
*/
-static DEFINE_MUTEX(task_group_mutex);
+static DEFINE_SPINLOCK(task_group_lock);
/* doms_cur_mutex serializes access to doms_cur[] array */
static DEFINE_MUTEX(doms_cur_mutex);
+#ifdef CONFIG_FAIR_GROUP_SCHED
#ifdef CONFIG_SMP
/* kernel thread that runs rebalance_shares() periodically */
static struct task_struct *lb_monitor_task;
@@ -248,18 +258,7 @@
static void set_se_shares(struct sched_entity *se, unsigned long shares);
-/* Default task group.
- * Every task in system belong to this group at bootup.
- */
-struct task_group init_task_group = {
- .se = init_sched_entity_p,
- .cfs_rq = init_cfs_rq_p,
-
- .rt_se = init_sched_rt_entity_p,
- .rt_rq = init_rt_rq_p,
-};
-
-#ifdef CONFIG_FAIR_USER_SCHED
+#ifdef CONFIG_USER_SCHED
# define INIT_TASK_GROUP_LOAD (2*NICE_0_LOAD)
#else
# define INIT_TASK_GROUP_LOAD NICE_0_LOAD
@@ -268,15 +267,31 @@
#define MIN_GROUP_SHARES 2
static int init_task_group_load = INIT_TASK_GROUP_LOAD;
+#endif
+
+/* Default task group.
+ * Every task in system belong to this group at bootup.
+ */
+struct task_group init_task_group = {
+#ifdef CONFIG_FAIR_GROUP_SCHED
+ .se = init_sched_entity_p,
+ .cfs_rq = init_cfs_rq_p,
+#endif
+
+#ifdef CONFIG_RT_GROUP_SCHED
+ .rt_se = init_sched_rt_entity_p,
+ .rt_rq = init_rt_rq_p,
+#endif
+};
/* return group to which a task belongs */
static inline struct task_group *task_group(struct task_struct *p)
{
struct task_group *tg;
-#ifdef CONFIG_FAIR_USER_SCHED
+#ifdef CONFIG_USER_SCHED
tg = p->user->tg;
-#elif defined(CONFIG_FAIR_CGROUP_SCHED)
+#elif defined(CONFIG_CGROUP_SCHED)
tg = container_of(task_subsys_state(p, cpu_cgroup_subsys_id),
struct task_group, css);
#else
@@ -288,21 +303,15 @@
/* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */
static inline void set_task_rq(struct task_struct *p, unsigned int cpu)
{
+#ifdef CONFIG_FAIR_GROUP_SCHED
p->se.cfs_rq = task_group(p)->cfs_rq[cpu];
p->se.parent = task_group(p)->se[cpu];
+#endif
+#ifdef CONFIG_RT_GROUP_SCHED
p->rt.rt_rq = task_group(p)->rt_rq[cpu];
p->rt.parent = task_group(p)->rt_se[cpu];
-}
-
-static inline void lock_task_group_list(void)
-{
- mutex_lock(&task_group_mutex);
-}
-
-static inline void unlock_task_group_list(void)
-{
- mutex_unlock(&task_group_mutex);
+#endif
}
static inline void lock_doms_cur(void)
@@ -318,12 +327,10 @@
#else
static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { }
-static inline void lock_task_group_list(void) { }
-static inline void unlock_task_group_list(void) { }
static inline void lock_doms_cur(void) { }
static inline void unlock_doms_cur(void) { }
-#endif /* CONFIG_FAIR_GROUP_SCHED */
+#endif /* CONFIG_GROUP_SCHED */
/* CFS-related fields in a runqueue */
struct cfs_rq {
@@ -363,7 +370,7 @@
struct rt_rq {
struct rt_prio_array active;
unsigned long rt_nr_running;
-#if defined CONFIG_SMP || defined CONFIG_FAIR_GROUP_SCHED
+#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
int highest_prio; /* highest queued rt task prio */
#endif
#ifdef CONFIG_SMP
@@ -373,7 +380,9 @@
int rt_throttled;
u64 rt_time;
-#ifdef CONFIG_FAIR_GROUP_SCHED
+#ifdef CONFIG_RT_GROUP_SCHED
+ unsigned long rt_nr_boosted;
+
struct rq *rq;
struct list_head leaf_rt_rq_list;
struct task_group *tg;
@@ -447,6 +456,8 @@
#ifdef CONFIG_FAIR_GROUP_SCHED
/* list of leaf cfs_rq on this cpu: */
struct list_head leaf_cfs_rq_list;
+#endif
+#ifdef CONFIG_RT_GROUP_SCHED
struct list_head leaf_rt_rq_list;
#endif
@@ -652,19 +663,21 @@
const_debug unsigned int sysctl_sched_nr_migrate = 32;
/*
- * period over which we measure -rt task cpu usage in ms.
+ * period over which we measure -rt task cpu usage in us.
* default: 1s
*/
-const_debug unsigned int sysctl_sched_rt_period = 1000;
-
-#define SCHED_RT_FRAC_SHIFT 16
-#define SCHED_RT_FRAC (1UL << SCHED_RT_FRAC_SHIFT)
+unsigned int sysctl_sched_rt_period = 1000000;
/*
- * ratio of time -rt tasks may consume.
- * default: 95%
+ * part of the period that we allow rt tasks to run in us.
+ * default: 0.95s
*/
-const_debug unsigned int sysctl_sched_rt_ratio = 62259;
+int sysctl_sched_rt_runtime = 950000;
+
+/*
+ * single value that denotes runtime == period, ie unlimited time.
+ */
+#define RUNTIME_INF ((u64)~0ULL)
/*
* For kernel-internal use: high-speed (but slightly incorrect) per-cpu
@@ -4571,6 +4584,15 @@
return -EPERM;
}
+#ifdef CONFIG_RT_GROUP_SCHED
+ /*
+ * Do not allow realtime tasks into groups that have no runtime
+ * assigned.
+ */
+ if (rt_policy(policy) && task_group(p)->rt_runtime == 0)
+ return -EPERM;
+#endif
+
retval = security_task_setscheduler(p, policy, param);
if (retval)
return retval;
@@ -7112,7 +7134,7 @@
/* delimiter for bitsearch: */
__set_bit(MAX_RT_PRIO, array->bitmap);
-#if defined CONFIG_SMP || defined CONFIG_FAIR_GROUP_SCHED
+#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
rt_rq->highest_prio = MAX_RT_PRIO;
#endif
#ifdef CONFIG_SMP
@@ -7123,7 +7145,8 @@
rt_rq->rt_time = 0;
rt_rq->rt_throttled = 0;
-#ifdef CONFIG_FAIR_GROUP_SCHED
+#ifdef CONFIG_RT_GROUP_SCHED
+ rt_rq->rt_nr_boosted = 0;
rt_rq->rq = rq;
#endif
}
@@ -7146,7 +7169,9 @@
se->load.inv_weight = div64_64(1ULL<<32, se->load.weight);
se->parent = NULL;
}
+#endif
+#ifdef CONFIG_RT_GROUP_SCHED
static void init_tg_rt_entry(struct rq *rq, struct task_group *tg,
struct rt_rq *rt_rq, struct sched_rt_entity *rt_se,
int cpu, int add)
@@ -7175,7 +7200,7 @@
init_defrootdomain();
#endif
-#ifdef CONFIG_FAIR_GROUP_SCHED
+#ifdef CONFIG_GROUP_SCHED
list_add(&init_task_group.list, &task_groups);
#endif
@@ -7196,7 +7221,10 @@
&per_cpu(init_cfs_rq, i),
&per_cpu(init_sched_entity, i), i, 1);
- init_task_group.rt_ratio = sysctl_sched_rt_ratio; /* XXX */
+#endif
+#ifdef CONFIG_RT_GROUP_SCHED
+ init_task_group.rt_runtime =
+ sysctl_sched_rt_runtime * NSEC_PER_USEC;
INIT_LIST_HEAD(&rq->leaf_rt_rq_list);
init_tg_rt_entry(rq, &init_task_group,
&per_cpu(init_rt_rq, i),
@@ -7303,7 +7331,7 @@
unsigned long flags;
struct rq *rq;
- read_lock_irq(&tasklist_lock);
+ read_lock_irqsave(&tasklist_lock, flags);
do_each_thread(g, p) {
/*
* Only normalize user tasks:
@@ -7329,16 +7357,16 @@
continue;
}
- spin_lock_irqsave(&p->pi_lock, flags);
+ spin_lock(&p->pi_lock);
rq = __task_rq_lock(p);
normalize_task(rq, p);
__task_rq_unlock(rq);
- spin_unlock_irqrestore(&p->pi_lock, flags);
+ spin_unlock(&p->pi_lock);
} while_each_thread(g, p);
- read_unlock_irq(&tasklist_lock);
+ read_unlock_irqrestore(&tasklist_lock, flags);
}
#endif /* CONFIG_MAGIC_SYSRQ */
@@ -7387,9 +7415,9 @@
#endif
-#ifdef CONFIG_FAIR_GROUP_SCHED
+#ifdef CONFIG_GROUP_SCHED
-#ifdef CONFIG_SMP
+#if defined CONFIG_FAIR_GROUP_SCHED && defined CONFIG_SMP
/*
* distribute shares of all task groups among their schedulable entities,
* to reflect load distribution across cpus.
@@ -7540,7 +7568,8 @@
}
#endif /* CONFIG_SMP */
-static void free_sched_group(struct task_group *tg)
+#ifdef CONFIG_FAIR_GROUP_SCHED
+static void free_fair_sched_group(struct task_group *tg)
{
int i;
@@ -7549,49 +7578,27 @@
kfree(tg->cfs_rq[i]);
if (tg->se)
kfree(tg->se[i]);
- if (tg->rt_rq)
- kfree(tg->rt_rq[i]);
- if (tg->rt_se)
- kfree(tg->rt_se[i]);
}
kfree(tg->cfs_rq);
kfree(tg->se);
- kfree(tg->rt_rq);
- kfree(tg->rt_se);
- kfree(tg);
}
-/* allocate runqueue etc for a new task group */
-struct task_group *sched_create_group(void)
+static int alloc_fair_sched_group(struct task_group *tg)
{
- struct task_group *tg;
struct cfs_rq *cfs_rq;
struct sched_entity *se;
- struct rt_rq *rt_rq;
- struct sched_rt_entity *rt_se;
struct rq *rq;
int i;
- tg = kzalloc(sizeof(*tg), GFP_KERNEL);
- if (!tg)
- return ERR_PTR(-ENOMEM);
-
tg->cfs_rq = kzalloc(sizeof(cfs_rq) * NR_CPUS, GFP_KERNEL);
if (!tg->cfs_rq)
goto err;
tg->se = kzalloc(sizeof(se) * NR_CPUS, GFP_KERNEL);
if (!tg->se)
goto err;
- tg->rt_rq = kzalloc(sizeof(rt_rq) * NR_CPUS, GFP_KERNEL);
- if (!tg->rt_rq)
- goto err;
- tg->rt_se = kzalloc(sizeof(rt_se) * NR_CPUS, GFP_KERNEL);
- if (!tg->rt_se)
- goto err;
tg->shares = NICE_0_LOAD;
- tg->rt_ratio = 0; /* XXX */
for_each_possible_cpu(i) {
rq = cpu_rq(i);
@@ -7606,6 +7613,79 @@
if (!se)
goto err;
+ init_tg_cfs_entry(rq, tg, cfs_rq, se, i, 0);
+ }
+
+ return 1;
+
+ err:
+ return 0;
+}
+
+static inline void register_fair_sched_group(struct task_group *tg, int cpu)
+{
+ list_add_rcu(&tg->cfs_rq[cpu]->leaf_cfs_rq_list,
+ &cpu_rq(cpu)->leaf_cfs_rq_list);
+}
+
+static inline void unregister_fair_sched_group(struct task_group *tg, int cpu)
+{
+ list_del_rcu(&tg->cfs_rq[cpu]->leaf_cfs_rq_list);
+}
+#else
+static inline void free_fair_sched_group(struct task_group *tg)
+{
+}
+
+static inline int alloc_fair_sched_group(struct task_group *tg)
+{
+ return 1;
+}
+
+static inline void register_fair_sched_group(struct task_group *tg, int cpu)
+{
+}
+
+static inline void unregister_fair_sched_group(struct task_group *tg, int cpu)
+{
+}
+#endif
+
+#ifdef CONFIG_RT_GROUP_SCHED
+static void free_rt_sched_group(struct task_group *tg)
+{
+ int i;
+
+ for_each_possible_cpu(i) {
+ if (tg->rt_rq)
+ kfree(tg->rt_rq[i]);
+ if (tg->rt_se)
+ kfree(tg->rt_se[i]);
+ }
+
+ kfree(tg->rt_rq);
+ kfree(tg->rt_se);
+}
+
+static int alloc_rt_sched_group(struct task_group *tg)
+{
+ struct rt_rq *rt_rq;
+ struct sched_rt_entity *rt_se;
+ struct rq *rq;
+ int i;
+
+ tg->rt_rq = kzalloc(sizeof(rt_rq) * NR_CPUS, GFP_KERNEL);
+ if (!tg->rt_rq)
+ goto err;
+ tg->rt_se = kzalloc(sizeof(rt_se) * NR_CPUS, GFP_KERNEL);
+ if (!tg->rt_se)
+ goto err;
+
+ tg->rt_runtime = 0;
+
+ for_each_possible_cpu(i) {
+ rq = cpu_rq(i);
+
rt_rq = kmalloc_node(sizeof(struct rt_rq),
GFP_KERNEL|__GFP_ZERO, cpu_to_node(i));
if (!rt_rq)
@@ -7616,20 +7696,75 @@
if (!rt_se)
goto err;
- init_tg_cfs_entry(rq, tg, cfs_rq, se, i, 0);
init_tg_rt_entry(rq, tg, rt_rq, rt_se, i, 0);
}
- lock_task_group_list();
+ return 1;
+
+ err:
+ return 0;
+}
+
+static inline void register_rt_sched_group(struct task_group *tg, int cpu)
+{
+ list_add_rcu(&tg->rt_rq[cpu]->leaf_rt_rq_list,
+ &cpu_rq(cpu)->leaf_rt_rq_list);
+}
+
+static inline void unregister_rt_sched_group(struct task_group *tg, int cpu)
+{
+ list_del_rcu(&tg->rt_rq[cpu]->leaf_rt_rq_list);
+}
+#else
+static inline void free_rt_sched_group(struct task_group *tg)
+{
+}
+
+static inline int alloc_rt_sched_group(struct task_group *tg)
+{
+ return 1;
+}
+
+static inline void register_rt_sched_group(struct task_group *tg, int cpu)
+{
+}
+
+static inline void unregister_rt_sched_group(struct task_group *tg, int cpu)
+{
+}
+#endif
+
+static void free_sched_group(struct task_group *tg)
+{
+ free_fair_sched_group(tg);
+ free_rt_sched_group(tg);
+ kfree(tg);
+}
+
+/* allocate runqueue etc for a new task group */
+struct task_group *sched_create_group(void)
+{
+ struct task_group *tg;
+ unsigned long flags;
+ int i;
+
+ tg = kzalloc(sizeof(*tg), GFP_KERNEL);
+ if (!tg)
+ return ERR_PTR(-ENOMEM);
+
+ if (!alloc_fair_sched_group(tg))
+ goto err;
+
+ if (!alloc_rt_sched_group(tg))
+ goto err;
+
+ spin_lock_irqsave(&task_group_lock, flags);
for_each_possible_cpu(i) {
- rq = cpu_rq(i);
- cfs_rq = tg->cfs_rq[i];
- list_add_rcu(&cfs_rq->leaf_cfs_rq_list, &rq->leaf_cfs_rq_list);
- rt_rq = tg->rt_rq[i];
- list_add_rcu(&rt_rq->leaf_rt_rq_list, &rq->leaf_rt_rq_list);
+ register_fair_sched_group(tg, i);
+ register_rt_sched_group(tg, i);
}
list_add_rcu(&tg->list, &task_groups);
- unlock_task_group_list();
+ spin_unlock_irqrestore(&task_group_lock, flags);
return tg;
@@ -7648,21 +7783,16 @@
/* Destroy runqueue etc associated with a task group */
void sched_destroy_group(struct task_group *tg)
{
- struct cfs_rq *cfs_rq = NULL;
- struct rt_rq *rt_rq = NULL;
+ unsigned long flags;
int i;
- lock_task_group_list();
+ spin_lock_irqsave(&task_group_lock, flags);
for_each_possible_cpu(i) {
- cfs_rq = tg->cfs_rq[i];
- list_del_rcu(&cfs_rq->leaf_cfs_rq_list);
- rt_rq = tg->rt_rq[i];
- list_del_rcu(&rt_rq->leaf_rt_rq_list);
+ unregister_fair_sched_group(tg, i);
+ unregister_rt_sched_group(tg, i);
}
list_del_rcu(&tg->list);
- unlock_task_group_list();
-
- BUG_ON(!cfs_rq);
+ spin_unlock_irqrestore(&task_group_lock, flags);
/* wait for possible concurrent references to cfs_rqs complete */
call_rcu(&tg->rcu, free_sched_group_rcu);
@@ -7703,6 +7833,7 @@
task_rq_unlock(rq, &flags);
}
+#ifdef CONFIG_FAIR_GROUP_SCHED
/* rq->lock to be locked by caller */
static void set_se_shares(struct sched_entity *se, unsigned long shares)
{
@@ -7728,13 +7859,14 @@
}
}
+static DEFINE_MUTEX(shares_mutex);
+
int sched_group_set_shares(struct task_group *tg, unsigned long shares)
{
int i;
- struct cfs_rq *cfs_rq;
- struct rq *rq;
+ unsigned long flags;
- lock_task_group_list();
+ mutex_lock(&shares_mutex);
if (tg->shares == shares)
goto done;
@@ -7746,10 +7878,10 @@
* load_balance_fair) from referring to this group first,
* by taking it off the rq->leaf_cfs_rq_list on each cpu.
*/
- for_each_possible_cpu(i) {
- cfs_rq = tg->cfs_rq[i];
- list_del_rcu(&cfs_rq->leaf_cfs_rq_list);
- }
+ spin_lock_irqsave(&task_group_lock, flags);
+ for_each_possible_cpu(i)
+ unregister_fair_sched_group(tg, i);
+ spin_unlock_irqrestore(&task_group_lock, flags);
/* wait for any ongoing reference to this group to finish */
synchronize_sched();
@@ -7769,13 +7901,12 @@
* Enable load balance activity on this group, by inserting it back on
* each cpu's rq->leaf_cfs_rq_list.
*/
- for_each_possible_cpu(i) {
- rq = cpu_rq(i);
- cfs_rq = tg->cfs_rq[i];
- list_add_rcu(&cfs_rq->leaf_cfs_rq_list, &rq->leaf_cfs_rq_list);
- }
+ spin_lock_irqsave(&task_group_lock, flags);
+ for_each_possible_cpu(i)
+ register_fair_sched_group(tg, i);
+ spin_unlock_irqrestore(&task_group_lock, flags);
done:
- unlock_task_group_list();
+ mutex_unlock(&shares_mutex);
return 0;
}
@@ -7783,35 +7914,84 @@
{
return tg->shares;
}
+#endif
+#ifdef CONFIG_RT_GROUP_SCHED
/*
- * Ensure the total rt_ratio <= sysctl_sched_rt_ratio
+ * Ensure that the real time constraints are schedulable.
*/
-int sched_group_set_rt_ratio(struct task_group *tg, unsigned long rt_ratio)
+static DEFINE_MUTEX(rt_constraints_mutex);
+
+static unsigned long to_ratio(u64 period, u64 runtime)
+{
+ if (runtime == RUNTIME_INF)
+ return 1ULL << 16;
+
+ runtime *= (1ULL << 16);
+ div64_64(runtime, period);
+ return runtime;
+}
+
+static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
{
struct task_group *tgi;
unsigned long total = 0;
+ unsigned long global_ratio =
+ to_ratio(sysctl_sched_rt_period,
+ sysctl_sched_rt_runtime < 0 ?
+ RUNTIME_INF : sysctl_sched_rt_runtime);
rcu_read_lock();
- list_for_each_entry_rcu(tgi, &task_groups, list)
- total += tgi->rt_ratio;
+ list_for_each_entry_rcu(tgi, &task_groups, list) {
+ if (tgi == tg)
+ continue;
+
+ total += to_ratio(period, tgi->rt_runtime);
+ }
rcu_read_unlock();
- if (total + rt_ratio - tg->rt_ratio > sysctl_sched_rt_ratio)
- return -EINVAL;
-
- tg->rt_ratio = rt_ratio;
- return 0;
+ return total + to_ratio(period, runtime) < global_ratio;
}
-unsigned long sched_group_rt_ratio(struct task_group *tg)
+int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us)
{
- return tg->rt_ratio;
+ u64 rt_runtime, rt_period;
+ int err = 0;
+
+ rt_period = sysctl_sched_rt_period * NSEC_PER_USEC;
+ rt_runtime = (u64)rt_runtime_us * NSEC_PER_USEC;
+ if (rt_runtime_us == -1)
+ rt_runtime = rt_period;
+
+ mutex_lock(&rt_constraints_mutex);
+ if (!__rt_schedulable(tg, rt_period, rt_runtime)) {
+ err = -EINVAL;
+ goto unlock;
+ }
+ if (rt_runtime_us == -1)
+ rt_runtime = RUNTIME_INF;
+ tg->rt_runtime = rt_runtime;
+ unlock:
+ mutex_unlock(&rt_constraints_mutex);
+
+ return err;
}
-#endif /* CONFIG_FAIR_GROUP_SCHED */
+long sched_group_rt_runtime(struct task_group *tg)
+{
+ u64 rt_runtime_us;
-#ifdef CONFIG_FAIR_CGROUP_SCHED
+ if (tg->rt_runtime == RUNTIME_INF)
+ return -1;
+
+ rt_runtime_us = tg->rt_runtime;
+ do_div(rt_runtime_us, NSEC_PER_USEC);
+ return rt_runtime_us;
+}
+#endif
+#endif /* CONFIG_GROUP_SCHED */
+
+#ifdef CONFIG_CGROUP_SCHED
/* return corresponding task_group object of a cgroup */
static inline struct task_group *cgroup_tg(struct cgroup *cgrp)
@@ -7857,9 +8037,15 @@
cpu_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
struct task_struct *tsk)
{
+#ifdef CONFIG_RT_GROUP_SCHED
+ /* Don't accept realtime tasks when there is no way for them to run */
+ if (rt_task(tsk) && cgroup_tg(cgrp)->rt_runtime == 0)
+ return -EINVAL;
+#else
/* We don't support RT-tasks being in separate groups */
if (tsk->sched_class != &fair_sched_class)
return -EINVAL;
+#endif
return 0;
}
@@ -7871,6 +8057,7 @@
sched_move_task(tsk);
}
+#ifdef CONFIG_FAIR_GROUP_SCHED
static int cpu_shares_write_uint(struct cgroup *cgrp, struct cftype *cftype,
u64 shareval)
{
@@ -7883,31 +8070,70 @@
return (u64) tg->shares;
}
+#endif
-static int cpu_rt_ratio_write_uint(struct cgroup *cgrp, struct cftype *cftype,
- u64 rt_ratio_val)
+#ifdef CONFIG_RT_GROUP_SCHED
+static int cpu_rt_runtime_write(struct cgroup *cgrp, struct cftype *cft,
+ struct file *file,
+ const char __user *userbuf,
+ size_t nbytes, loff_t *unused_ppos)
{
- return sched_group_set_rt_ratio(cgroup_tg(cgrp), rt_ratio_val);
+ char buffer[64];
+ int retval = 0;
+ s64 val;
+ char *end;
+
+ if (!nbytes)
+ return -EINVAL;
+ if (nbytes >= sizeof(buffer))
+ return -E2BIG;
+ if (copy_from_user(buffer, userbuf, nbytes))
+ return -EFAULT;
+
+ buffer[nbytes] = 0; /* nul-terminate */
+
+ /* strip newline if necessary */
+ if (nbytes && (buffer[nbytes-1] == '\n'))
+ buffer[nbytes-1] = 0;
+ val = simple_strtoll(buffer, &end, 0);
+ if (*end)
+ return -EINVAL;
+
+ /* Pass to subsystem */
+ retval = sched_group_set_rt_runtime(cgroup_tg(cgrp), val);
+ if (!retval)
+ retval = nbytes;
+ return retval;
}
-static u64 cpu_rt_ratio_read_uint(struct cgroup *cgrp, struct cftype *cft)
+static ssize_t cpu_rt_runtime_read(struct cgroup *cgrp, struct cftype *cft,
+ struct file *file,
+ char __user *buf, size_t nbytes,
+ loff_t *ppos)
{
- struct task_group *tg = cgroup_tg(cgrp);
+ char tmp[64];
+ long val = sched_group_rt_runtime(cgroup_tg(cgrp));
+ int len = sprintf(tmp, "%ld\n", val);
- return (u64) tg->rt_ratio;
+ return simple_read_from_buffer(buf, nbytes, ppos, tmp, len);
}
+#endif
static struct cftype cpu_files[] = {
+#ifdef CONFIG_FAIR_GROUP_SCHED
{
.name = "shares",
.read_uint = cpu_shares_read_uint,
.write_uint = cpu_shares_write_uint,
},
+#endif
+#ifdef CONFIG_RT_GROUP_SCHED
{
- .name = "rt_ratio",
- .read_uint = cpu_rt_ratio_read_uint,
- .write_uint = cpu_rt_ratio_write_uint,
+ .name = "rt_runtime_us",
+ .read = cpu_rt_runtime_read,
+ .write = cpu_rt_runtime_write,
},
+#endif
};
static int cpu_cgroup_populate(struct cgroup_subsys *ss, struct cgroup *cont)
@@ -7926,7 +8152,7 @@
.early_init = 1,
};
-#endif /* CONFIG_FAIR_CGROUP_SCHED */
+#endif /* CONFIG_CGROUP_SCHED */
#ifdef CONFIG_CGROUP_CPUACCT
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 274b40d..f54792b 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -55,14 +55,14 @@
return !list_empty(&rt_se->run_list);
}
-#ifdef CONFIG_FAIR_GROUP_SCHED
+#ifdef CONFIG_RT_GROUP_SCHED
-static inline unsigned int sched_rt_ratio(struct rt_rq *rt_rq)
+static inline u64 sched_rt_runtime(struct rt_rq *rt_rq)
{
if (!rt_rq->tg)
- return SCHED_RT_FRAC;
+ return RUNTIME_INF;
- return rt_rq->tg->rt_ratio;
+ return rt_rq->tg->rt_runtime;
}
#define for_each_leaf_rt_rq(rt_rq, rq) \
@@ -89,7 +89,7 @@
static void enqueue_rt_entity(struct sched_rt_entity *rt_se);
static void dequeue_rt_entity(struct sched_rt_entity *rt_se);
-static void sched_rt_ratio_enqueue(struct rt_rq *rt_rq)
+static void sched_rt_rq_enqueue(struct rt_rq *rt_rq)
{
struct sched_rt_entity *rt_se = rt_rq->rt_se;
@@ -102,7 +102,7 @@
}
}
-static void sched_rt_ratio_dequeue(struct rt_rq *rt_rq)
+static void sched_rt_rq_dequeue(struct rt_rq *rt_rq)
{
struct sched_rt_entity *rt_se = rt_rq->rt_se;
@@ -110,11 +110,31 @@
dequeue_rt_entity(rt_se);
}
+static inline int rt_rq_throttled(struct rt_rq *rt_rq)
+{
+ return rt_rq->rt_throttled && !rt_rq->rt_nr_boosted;
+}
+
+static int rt_se_boosted(struct sched_rt_entity *rt_se)
+{
+ struct rt_rq *rt_rq = group_rt_rq(rt_se);
+ struct task_struct *p;
+
+ if (rt_rq)
+ return !!rt_rq->rt_nr_boosted;
+
+ p = rt_task_of(rt_se);
+ return p->prio != p->normal_prio;
+}
+
#else
-static inline unsigned int sched_rt_ratio(struct rt_rq *rt_rq)
+static inline u64 sched_rt_runtime(struct rt_rq *rt_rq)
{
- return sysctl_sched_rt_ratio;
+ if (sysctl_sched_rt_runtime == -1)
+ return RUNTIME_INF;
+
+ return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC;
}
#define for_each_leaf_rt_rq(rt_rq, rq) \
@@ -141,19 +161,23 @@
return NULL;
}
-static inline void sched_rt_ratio_enqueue(struct rt_rq *rt_rq)
+static inline void sched_rt_rq_enqueue(struct rt_rq *rt_rq)
{
}
-static inline void sched_rt_ratio_dequeue(struct rt_rq *rt_rq)
+static inline void sched_rt_rq_dequeue(struct rt_rq *rt_rq)
{
}
+static inline int rt_rq_throttled(struct rt_rq *rt_rq)
+{
+ return rt_rq->rt_throttled;
+}
#endif
static inline int rt_se_prio(struct sched_rt_entity *rt_se)
{
-#ifdef CONFIG_FAIR_GROUP_SCHED
+#ifdef CONFIG_RT_GROUP_SCHED
struct rt_rq *rt_rq = group_rt_rq(rt_se);
if (rt_rq)
@@ -163,28 +187,26 @@
return rt_task_of(rt_se)->prio;
}
-static int sched_rt_ratio_exceeded(struct rt_rq *rt_rq)
+static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq)
{
- unsigned int rt_ratio = sched_rt_ratio(rt_rq);
- u64 period, ratio;
+ u64 runtime = sched_rt_runtime(rt_rq);
- if (rt_ratio == SCHED_RT_FRAC)
+ if (runtime == RUNTIME_INF)
return 0;
if (rt_rq->rt_throttled)
- return 1;
+ return rt_rq_throttled(rt_rq);
- period = (u64)sysctl_sched_rt_period * NSEC_PER_MSEC;
- ratio = (period * rt_ratio) >> SCHED_RT_FRAC_SHIFT;
-
- if (rt_rq->rt_time > ratio) {
+ if (rt_rq->rt_time > runtime) {
struct rq *rq = rq_of_rt_rq(rt_rq);
rq->rt_throttled = 1;
rt_rq->rt_throttled = 1;
- sched_rt_ratio_dequeue(rt_rq);
- return 1;
+ if (rt_rq_throttled(rt_rq)) {
+ sched_rt_rq_dequeue(rt_rq);
+ return 1;
+ }
}
return 0;
@@ -196,17 +218,16 @@
u64 period;
while (rq->clock > rq->rt_period_expire) {
- period = (u64)sysctl_sched_rt_period * NSEC_PER_MSEC;
+ period = (u64)sysctl_sched_rt_period * NSEC_PER_USEC;
rq->rt_period_expire += period;
for_each_leaf_rt_rq(rt_rq, rq) {
- unsigned long rt_ratio = sched_rt_ratio(rt_rq);
- u64 ratio = (period * rt_ratio) >> SCHED_RT_FRAC_SHIFT;
+ u64 runtime = sched_rt_runtime(rt_rq);
- rt_rq->rt_time -= min(rt_rq->rt_time, ratio);
- if (rt_rq->rt_throttled) {
+ rt_rq->rt_time -= min(rt_rq->rt_time, runtime);
+ if (rt_rq->rt_throttled && rt_rq->rt_time < runtime) {
rt_rq->rt_throttled = 0;
- sched_rt_ratio_enqueue(rt_rq);
+ sched_rt_rq_enqueue(rt_rq);
}
}
@@ -239,12 +260,7 @@
cpuacct_charge(curr, delta_exec);
rt_rq->rt_time += delta_exec;
- /*
- * might make it a tad more accurate:
- *
- * update_sched_rt_period(rq);
- */
- if (sched_rt_ratio_exceeded(rt_rq))
+ if (sched_rt_runtime_exceeded(rt_rq))
resched_task(curr);
}
@@ -253,7 +269,7 @@
{
WARN_ON(!rt_prio(rt_se_prio(rt_se)));
rt_rq->rt_nr_running++;
-#if defined CONFIG_SMP || defined CONFIG_FAIR_GROUP_SCHED
+#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
if (rt_se_prio(rt_se) < rt_rq->highest_prio)
rt_rq->highest_prio = rt_se_prio(rt_se);
#endif
@@ -265,6 +281,10 @@
update_rt_migration(rq_of_rt_rq(rt_rq));
#endif
+#ifdef CONFIG_RT_GROUP_SCHED
+ if (rt_se_boosted(rt_se))
+ rt_rq->rt_nr_boosted++;
+#endif
}
static inline
@@ -273,7 +293,7 @@
WARN_ON(!rt_prio(rt_se_prio(rt_se)));
WARN_ON(!rt_rq->rt_nr_running);
rt_rq->rt_nr_running--;
-#if defined CONFIG_SMP || defined CONFIG_FAIR_GROUP_SCHED
+#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
if (rt_rq->rt_nr_running) {
struct rt_prio_array *array;
@@ -295,6 +315,12 @@
update_rt_migration(rq_of_rt_rq(rt_rq));
#endif /* CONFIG_SMP */
+#ifdef CONFIG_RT_GROUP_SCHED
+ if (rt_se_boosted(rt_se))
+ rt_rq->rt_nr_boosted--;
+
+ WARN_ON(!rt_rq->rt_nr_running && rt_rq->rt_nr_boosted);
+#endif
}
static void enqueue_rt_entity(struct sched_rt_entity *rt_se)
@@ -303,7 +329,7 @@
struct rt_prio_array *array = &rt_rq->active;
struct rt_rq *group_rq = group_rt_rq(rt_se);
- if (group_rq && group_rq->rt_throttled)
+ if (group_rq && rt_rq_throttled(group_rq))
return;
list_add_tail(&rt_se->run_list, array->queue + rt_se_prio(rt_se));
@@ -496,7 +522,7 @@
if (unlikely(!rt_rq->rt_nr_running))
return NULL;
- if (sched_rt_ratio_exceeded(rt_rq))
+ if (rt_rq_throttled(rt_rq))
return NULL;
do {
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index d41ef6b..924c674 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -311,22 +311,6 @@
.mode = 0644,
.proc_handler = &proc_dointvec,
},
- {
- .ctl_name = CTL_UNNUMBERED,
- .procname = "sched_rt_period_ms",
- .data = &sysctl_sched_rt_period,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = CTL_UNNUMBERED,
- .procname = "sched_rt_ratio",
- .data = &sysctl_sched_rt_ratio,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec,
- },
#if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
{
.ctl_name = CTL_UNNUMBERED,
@@ -348,6 +332,22 @@
#endif
{
.ctl_name = CTL_UNNUMBERED,
+ .procname = "sched_rt_period_us",
+ .data = &sysctl_sched_rt_period,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "sched_rt_runtime_us",
+ .data = &sysctl_sched_rt_runtime,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = CTL_UNNUMBERED,
.procname = "sched_compat_yield",
.data = &sysctl_sched_compat_yield,
.maxlen = sizeof(unsigned int),
diff --git a/kernel/user.c b/kernel/user.c
index 7d7900c..7132022 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -57,7 +57,7 @@
.uid_keyring = &root_user_keyring,
.session_keyring = &root_session_keyring,
#endif
-#ifdef CONFIG_FAIR_USER_SCHED
+#ifdef CONFIG_USER_SCHED
.tg = &init_task_group,
#endif
};
@@ -90,7 +90,7 @@
return NULL;
}
-#ifdef CONFIG_FAIR_USER_SCHED
+#ifdef CONFIG_USER_SCHED
static void sched_destroy_user(struct user_struct *up)
{
@@ -113,15 +113,15 @@
sched_move_task(p);
}
-#else /* CONFIG_FAIR_USER_SCHED */
+#else /* CONFIG_USER_SCHED */
static void sched_destroy_user(struct user_struct *up) { }
static int sched_create_user(struct user_struct *up) { return 0; }
static void sched_switch_user(struct task_struct *p) { }
-#endif /* CONFIG_FAIR_USER_SCHED */
+#endif /* CONFIG_USER_SCHED */
-#if defined(CONFIG_FAIR_USER_SCHED) && defined(CONFIG_SYSFS)
+#if defined(CONFIG_USER_SCHED) && defined(CONFIG_SYSFS)
static struct kset *uids_kset; /* represents the /sys/kernel/uids/ directory */
static DEFINE_MUTEX(uids_mutex);
@@ -137,6 +137,7 @@
}
/* uid directory attributes */
+#ifdef CONFIG_FAIR_GROUP_SCHED
static ssize_t cpu_shares_show(struct kobject *kobj,
struct kobj_attribute *attr,
char *buf)
@@ -163,10 +164,45 @@
static struct kobj_attribute cpu_share_attr =
__ATTR(cpu_share, 0644, cpu_shares_show, cpu_shares_store);
+#endif
+
+#ifdef CONFIG_RT_GROUP_SCHED
+static ssize_t cpu_rt_runtime_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ struct user_struct *up = container_of(kobj, struct user_struct, kobj);
+
+ return sprintf(buf, "%lu\n", sched_group_rt_runtime(up->tg));
+}
+
+static ssize_t cpu_rt_runtime_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t size)
+{
+ struct user_struct *up = container_of(kobj, struct user_struct, kobj);
+ unsigned long rt_runtime;
+ int rc;
+
+ sscanf(buf, "%lu", &rt_runtime);
+
+ rc = sched_group_set_rt_runtime(up->tg, rt_runtime);
+
+ return (rc ? rc : size);
+}
+
+static struct kobj_attribute cpu_rt_runtime_attr =
+ __ATTR(cpu_rt_runtime, 0644, cpu_rt_runtime_show, cpu_rt_runtime_store);
+#endif
/* default attributes per uid directory */
static struct attribute *uids_attributes[] = {
+#ifdef CONFIG_FAIR_GROUP_SCHED
&cpu_share_attr.attr,
+#endif
+#ifdef CONFIG_RT_GROUP_SCHED
+ &cpu_rt_runtime_attr.attr,
+#endif
NULL
};
@@ -269,7 +305,7 @@
schedule_work(&up->work);
}
-#else /* CONFIG_FAIR_USER_SCHED && CONFIG_SYSFS */
+#else /* CONFIG_USER_SCHED && CONFIG_SYSFS */
int uids_sysfs_init(void) { return 0; }
static inline int uids_user_create(struct user_struct *up) { return 0; }
@@ -373,7 +409,7 @@
spin_lock_irq(&uidhash_lock);
up = uid_hash_find(uid, hashent);
if (up) {
- /* This case is not possible when CONFIG_FAIR_USER_SCHED
+ /* This case is not possible when CONFIG_USER_SCHED
* is defined, since we serialize alloc_uid() using
* uids_mutex. Hence no need to call
* sched_destroy_user() or remove_user_sysfs_dir().
