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sched: rt-group: make rt groups scheduling configurable 

Make the rt group scheduler compile time configurable.
Keep it experimental for now.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
hifive-unleashed-5.1
Peter Zijlstra 2008-02-13 15:45:40 +01:00 committed by Ingo Molnar
parent 9f0c1e560c
commit 052f1dc7eb
6 changed files with 155 additions and 71 deletions
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2
include/linux/cgroup_subsys.h
View File

@ -25,7 +25,7 @@ SUBSYS(ns)
/* */
#ifdef CONFIG_FAIR_CGROUP_SCHED
#ifdef CONFIG_CGROUP_SCHED
SUBSYS(cpu_cgroup)
#endif

11
include/linux/sched.h
View File

@ -590,7 +590,7 @@ struct user_struct {
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 @@ struct sched_rt_entity {
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;
@ -2027,19 +2027,22 @@ extern int sched_mc_power_savings, sched_smt_power_savings;
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

27
init/Kconfig
View File

@ -311,25 +311,36 @@ config CPUSETS
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

152
kernel/sched.c
View File

@ -155,7 +155,7 @@ struct rt_prio_array {
struct list_head queue[MAX_RT_PRIO];
};
#ifdef CONFIG_FAIR_GROUP_SCHED
#ifdef CONFIG_GROUP_SCHED
#include <linux/cgroup.h>
@ -165,19 +165,16 @@ static LIST_HEAD(task_groups);
/* 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;
u64 rt_runtime;
/*
* 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
@ -213,24 +210,36 @@ struct task_group {
*
*/
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_lock serializes add/remove of task groups and also changes to
* a task group's cpu shares.
@ -240,6 +249,7 @@ 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 int load_balance_monitor(void *unused);
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 @@ struct task_group init_task_group = {
#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
@ -288,11 +303,15 @@ static inline struct task_group *task_group(struct task_struct *p)
/* 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];
#endif
}
static inline void lock_doms_cur(void)
@ -311,7 +330,7 @@ static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { }
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 {
@ -351,7 +370,7 @@ struct cfs_rq {
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
@ -361,7 +380,7 @@ struct rt_rq {
int rt_throttled;
u64 rt_time;
#ifdef CONFIG_FAIR_GROUP_SCHED
#ifdef CONFIG_RT_GROUP_SCHED
unsigned long rt_nr_boosted;
struct rq *rq;
@ -437,6 +456,8 @@ struct rq {
#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
@ -7104,7 +7125,7 @@ static void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq)
/* 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
@ -7115,7 +7136,7 @@ static void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq)
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
@ -7139,7 +7160,9 @@ static void init_tg_cfs_entry(struct rq *rq, struct task_group *tg,
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)
@ -7168,7 +7191,7 @@ void __init sched_init(void)
init_defrootdomain();
#endif
#ifdef CONFIG_FAIR_GROUP_SCHED
#ifdef CONFIG_GROUP_SCHED
list_add(&init_task_group.list, &task_groups);
#endif
@ -7189,6 +7212,8 @@ void __init sched_init(void)
&per_cpu(init_cfs_rq, i),
&per_cpu(init_sched_entity, i), i, 1);
#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);
@ -7381,9 +7406,9 @@ void set_curr_task(int cpu, struct task_struct *p)
#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.
@ -7539,20 +7564,28 @@ static void free_sched_group(struct task_group *tg)
int i;
for_each_possible_cpu(i) {
#ifdef CONFIG_FAIR_GROUP_SCHED
if (tg->cfs_rq)
kfree(tg->cfs_rq[i]);
if (tg->se)
kfree(tg->se[i]);
#endif
#ifdef CONFIG_RT_GROUP_SCHED
if (tg->rt_rq)
kfree(tg->rt_rq[i]);
if (tg->rt_se)
kfree(tg->rt_se[i]);
#endif
}
#ifdef CONFIG_FAIR_GROUP_SCHED
kfree(tg->cfs_rq);
kfree(tg->se);
#endif
#ifdef CONFIG_RT_GROUP_SCHED
kfree(tg->rt_rq);
kfree(tg->rt_se);
#endif
kfree(tg);
}
@ -7560,10 +7593,14 @@ static void free_sched_group(struct task_group *tg)
struct task_group *sched_create_group(void)
{
struct task_group *tg;
#ifdef CONFIG_FAIR_GROUP_SCHED
struct cfs_rq *cfs_rq;
struct sched_entity *se;
#endif
#ifdef CONFIG_RT_GROUP_SCHED
struct rt_rq *rt_rq;
struct sched_rt_entity *rt_se;
#endif
struct rq *rq;
unsigned long flags;
int i;
@ -7572,12 +7609,18 @@ struct task_group *sched_create_group(void)
if (!tg)
return ERR_PTR(-ENOMEM);
#ifdef CONFIG_FAIR_GROUP_SCHED
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->shares = NICE_0_LOAD;
#endif
#ifdef CONFIG_RT_GROUP_SCHED
tg->rt_rq = kzalloc(sizeof(rt_rq) * NR_CPUS, GFP_KERNEL);
if (!tg->rt_rq)
goto err;
@ -7585,12 +7628,13 @@ struct task_group *sched_create_group(void)
if (!tg->rt_se)
goto err;
tg->shares = NICE_0_LOAD;
tg->rt_runtime = 0;
#endif
for_each_possible_cpu(i) {
rq = cpu_rq(i);
#ifdef CONFIG_FAIR_GROUP_SCHED
cfs_rq = kmalloc_node(sizeof(struct cfs_rq),
GFP_KERNEL|__GFP_ZERO, cpu_to_node(i));
if (!cfs_rq)
@ -7601,6 +7645,10 @@ struct task_group *sched_create_group(void)
if (!se)
goto err;
init_tg_cfs_entry(rq, tg, cfs_rq, se, i, 0);
#endif
#ifdef CONFIG_RT_GROUP_SCHED
rt_rq = kmalloc_node(sizeof(struct rt_rq),
GFP_KERNEL|__GFP_ZERO, cpu_to_node(i));
if (!rt_rq)
@ -7611,17 +7659,21 @@ struct task_group *sched_create_group(void)
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);
#endif
}
spin_lock_irqsave(&task_group_lock, flags);
for_each_possible_cpu(i) {
rq = cpu_rq(i);
#ifdef CONFIG_FAIR_GROUP_SCHED
cfs_rq = tg->cfs_rq[i];
list_add_rcu(&cfs_rq->leaf_cfs_rq_list, &rq->leaf_cfs_rq_list);
#endif
#ifdef CONFIG_RT_GROUP_SCHED
rt_rq = tg->rt_rq[i];
list_add_rcu(&rt_rq->leaf_rt_rq_list, &rq->leaf_rt_rq_list);
#endif
}
list_add_rcu(&tg->list, &task_groups);
spin_unlock_irqrestore(&task_group_lock, flags);
@ -7643,23 +7695,21 @@ static void free_sched_group_rcu(struct rcu_head *rhp)
/* 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;
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);
#ifdef CONFIG_FAIR_GROUP_SCHED
list_del_rcu(&tg->cfs_rq[i]->leaf_cfs_rq_list);
#endif
#ifdef CONFIG_RT_GROUP_SCHED
list_del_rcu(&tg->rt_rq[i]->leaf_rt_rq_list);
#endif
}
list_del_rcu(&tg->list);
spin_unlock_irqrestore(&task_group_lock, flags);
BUG_ON(!cfs_rq);
/* wait for possible concurrent references to cfs_rqs complete */
call_rcu(&tg->rcu, free_sched_group_rcu);
}
@ -7699,6 +7749,7 @@ void sched_move_task(struct task_struct *tsk)
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)
{
@ -7786,7 +7837,9 @@ unsigned long sched_group_shares(struct task_group *tg)
{
return tg->shares;
}
#endif
#ifdef CONFIG_RT_GROUP_SCHED
/*
* Ensure that the real time constraints are schedulable.
*/
@ -7858,9 +7911,10 @@ long sched_group_rt_runtime(struct task_group *tg)
do_div(rt_runtime_us, NSEC_PER_USEC);
return rt_runtime_us;
}
#endif /* CONFIG_FAIR_GROUP_SCHED */
#endif
#endif /* CONFIG_GROUP_SCHED */
#ifdef CONFIG_FAIR_CGROUP_SCHED
#ifdef CONFIG_CGROUP_SCHED
/* return corresponding task_group object of a cgroup */
static inline struct task_group *cgroup_tg(struct cgroup *cgrp)
@ -7920,6 +7974,7 @@ cpu_cgroup_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
sched_move_task(tsk);
}
#ifdef CONFIG_FAIR_GROUP_SCHED
static int cpu_shares_write_uint(struct cgroup *cgrp, struct cftype *cftype,
u64 shareval)
{
@ -7932,7 +7987,9 @@ static u64 cpu_shares_read_uint(struct cgroup *cgrp, struct cftype *cft)
return (u64) tg->shares;
}
#endif
#ifdef CONFIG_RT_GROUP_SCHED
static int cpu_rt_runtime_write(struct cgroup *cgrp, struct cftype *cft,
struct file *file,
const char __user *userbuf,
@ -7977,18 +8034,23 @@ static ssize_t cpu_rt_runtime_read(struct cgroup *cgrp, struct cftype *cft,
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_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)
@ -8007,7 +8069,7 @@ struct cgroup_subsys cpu_cgroup_subsys = {
.early_init = 1,
};
#endif /* CONFIG_FAIR_CGROUP_SCHED */
#endif /* CONFIG_CGROUP_SCHED */
#ifdef CONFIG_CGROUP_CPUACCT

12
kernel/sched_rt.c
View File

@ -55,7 +55,7 @@ static inline int on_rt_rq(struct sched_rt_entity *rt_se)
return !list_empty(&rt_se->run_list);
}
#ifdef CONFIG_FAIR_GROUP_SCHED
#ifdef CONFIG_RT_GROUP_SCHED
static inline u64 sched_rt_runtime(struct rt_rq *rt_rq)
{
@ -177,7 +177,7 @@ static inline int rt_rq_throttled(struct rt_rq *rt_rq)
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)
@ -269,7 +269,7 @@ void inc_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
{
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
@ -281,7 +281,7 @@ void inc_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
update_rt_migration(rq_of_rt_rq(rt_rq));
#endif
#ifdef CONFIG_FAIR_GROUP_SCHED
#ifdef CONFIG_RT_GROUP_SCHED
if (rt_se_boosted(rt_se))
rt_rq->rt_nr_boosted++;
#endif
@ -293,7 +293,7 @@ void dec_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
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;
@ -315,7 +315,7 @@ void dec_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
update_rt_migration(rq_of_rt_rq(rt_rq));
#endif /* CONFIG_SMP */
#ifdef CONFIG_FAIR_GROUP_SCHED
#ifdef CONFIG_RT_GROUP_SCHED
if (rt_se_boosted(rt_se))
rt_rq->rt_nr_boosted--;

22
kernel/user.c
View File

@ -57,7 +57,7 @@ struct user_struct root_user = {
.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 @@ static struct user_struct *uid_hash_find(uid_t uid, struct hlist_head *hashent)
return NULL;
}
#ifdef CONFIG_FAIR_USER_SCHED
#ifdef CONFIG_USER_SCHED
static void sched_destroy_user(struct user_struct *up)
{
@ -113,15 +113,15 @@ static void sched_switch_user(struct task_struct *p)
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 @@ static inline void uids_mutex_unlock(void)
}
/* uid directory attributes */
#ifdef CONFIG_FAIR_GROUP_SCHED
static ssize_t cpu_shares_show(struct kobject *kobj,
struct kobj_attribute *attr,
char *buf)
@ -163,7 +164,9 @@ static ssize_t cpu_shares_store(struct kobject *kobj,
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)
@ -190,11 +193,16 @@ static ssize_t cpu_rt_runtime_store(struct kobject *kobj,
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
};
@ -297,7 +305,7 @@ static inline void free_user(struct user_struct *up, unsigned long flags)
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; }
@ -401,7 +409,7 @@ struct user_struct * alloc_uid(struct user_namespace *ns, uid_t uid)
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().