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sched: rt-group: make rt groups scheduling configurable

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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>
This commit is contained in:
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) SUBSYS(cpu_cgroup)
#endif #endif

11
include/linux/sched.h
View File

@ -590,7 +590,7 @@ struct user_struct {
struct hlist_node uidhash_node; struct hlist_node uidhash_node;
uid_t uid; uid_t uid;
#ifdef CONFIG_FAIR_USER_SCHED #ifdef CONFIG_USER_SCHED
struct task_group *tg; struct task_group *tg;
#ifdef CONFIG_SYSFS #ifdef CONFIG_SYSFS
struct kobject kobj; struct kobject kobj;
@ -973,7 +973,7 @@ struct sched_rt_entity {
unsigned long timeout; unsigned long timeout;
int nr_cpus_allowed; int nr_cpus_allowed;
#ifdef CONFIG_FAIR_GROUP_SCHED #ifdef CONFIG_RT_GROUP_SCHED
struct sched_rt_entity *parent; struct sched_rt_entity *parent;
/* rq on which this entity is (to be) queued: */ /* rq on which this entity is (to be) queued: */
struct rt_rq *rt_rq; 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); 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 init_task_group;
extern struct task_group *sched_create_group(void); extern struct task_group *sched_create_group(void);
extern void sched_destroy_group(struct task_group *tg); extern void sched_destroy_group(struct task_group *tg);
extern void sched_move_task(struct task_struct *tsk); 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 int sched_group_set_shares(struct task_group *tg, unsigned long shares);
extern unsigned long sched_group_shares(struct task_group *tg); 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, extern int sched_group_set_rt_runtime(struct task_group *tg,
long rt_runtime_us); long rt_runtime_us);
extern long sched_group_rt_runtime(struct task_group *tg); extern long sched_group_rt_runtime(struct task_group *tg);
#endif
#endif #endif
#ifdef CONFIG_TASK_XACCT #ifdef CONFIG_TASK_XACCT

27
init/Kconfig
View File

@ -311,25 +311,36 @@ config CPUSETS
Say N if unsure. Say N if unsure.
config FAIR_GROUP_SCHED config GROUP_SCHED
bool "Fair group CPU scheduler" bool "Group CPU scheduler"
default y default y
help help
This feature lets CPU scheduler recognize task groups and control CPU This feature lets CPU scheduler recognize task groups and control CPU
bandwidth allocation to such task groups. bandwidth allocation to such task groups.
choice config FAIR_GROUP_SCHED
depends on FAIR_GROUP_SCHED bool "Group scheduling for SCHED_OTHER"
prompt "Basis for grouping tasks" depends on GROUP_SCHED
default FAIR_USER_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" bool "user id"
help help
This option will choose userid as the basis for grouping This option will choose userid as the basis for grouping
tasks, thus providing equal CPU bandwidth to each user. tasks, thus providing equal CPU bandwidth to each user.
config FAIR_CGROUP_SCHED config CGROUP_SCHED
bool "Control groups" bool "Control groups"
depends on CGROUPS depends on CGROUPS
help help

152
kernel/sched.c
View File

@ -155,7 +155,7 @@ struct rt_prio_array {
struct list_head queue[MAX_RT_PRIO]; struct list_head queue[MAX_RT_PRIO];
}; };
#ifdef CONFIG_FAIR_GROUP_SCHED #ifdef CONFIG_GROUP_SCHED
#include <linux/cgroup.h> #include <linux/cgroup.h>
@ -165,19 +165,16 @@ static LIST_HEAD(task_groups);
/* task group related information */ /* task group related information */
struct task_group { struct task_group {
#ifdef CONFIG_FAIR_CGROUP_SCHED #ifdef CONFIG_CGROUP_SCHED
struct cgroup_subsys_state css; struct cgroup_subsys_state css;
#endif #endif
#ifdef CONFIG_FAIR_GROUP_SCHED
/* schedulable entities of this group on each cpu */ /* schedulable entities of this group on each cpu */
struct sched_entity **se; struct sched_entity **se;
/* runqueue "owned" by this group on each cpu */ /* runqueue "owned" by this group on each cpu */
struct cfs_rq **cfs_rq; 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 * 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 * is allocated to the group. The more shares a group has, the more is
@ -213,24 +210,36 @@ struct task_group {
* *
*/ */
unsigned long shares; 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 rcu_head rcu;
struct list_head list; struct list_head list;
}; };
#ifdef CONFIG_FAIR_GROUP_SCHED
/* Default task group's sched entity on each cpu */ /* Default task group's sched entity on each cpu */
static DEFINE_PER_CPU(struct sched_entity, init_sched_entity); static DEFINE_PER_CPU(struct sched_entity, init_sched_entity);
/* Default task group's cfs_rq on each cpu */ /* Default task group's cfs_rq on each cpu */
static DEFINE_PER_CPU(struct cfs_rq, init_cfs_rq) ____cacheline_aligned_in_smp; 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 sched_rt_entity, init_sched_rt_entity);
static DEFINE_PER_CPU(struct rt_rq, init_rt_rq) ____cacheline_aligned_in_smp; 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 sched_rt_entity *init_sched_rt_entity_p[NR_CPUS];
static struct rt_rq *init_rt_rq_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 /* task_group_lock serializes add/remove of task groups and also changes to
* a task group's cpu shares. * 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 */ /* doms_cur_mutex serializes access to doms_cur[] array */
static DEFINE_MUTEX(doms_cur_mutex); static DEFINE_MUTEX(doms_cur_mutex);
#ifdef CONFIG_FAIR_GROUP_SCHED
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
/* kernel thread that runs rebalance_shares() periodically */ /* kernel thread that runs rebalance_shares() periodically */
static struct task_struct *lb_monitor_task; 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); static void set_se_shares(struct sched_entity *se, unsigned long shares);
/* Default task group. #ifdef CONFIG_USER_SCHED
* 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
# define INIT_TASK_GROUP_LOAD (2*NICE_0_LOAD) # define INIT_TASK_GROUP_LOAD (2*NICE_0_LOAD)
#else #else
# define INIT_TASK_GROUP_LOAD NICE_0_LOAD # define INIT_TASK_GROUP_LOAD NICE_0_LOAD
@ -268,15 +267,31 @@ struct task_group init_task_group = {
#define MIN_GROUP_SHARES 2 #define MIN_GROUP_SHARES 2
static int init_task_group_load = INIT_TASK_GROUP_LOAD; 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 */ /* return group to which a task belongs */
static inline struct task_group *task_group(struct task_struct *p) static inline struct task_group *task_group(struct task_struct *p)
{ {
struct task_group *tg; struct task_group *tg;
#ifdef CONFIG_FAIR_USER_SCHED #ifdef CONFIG_USER_SCHED
tg = p->user->tg; 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), tg = container_of(task_subsys_state(p, cpu_cgroup_subsys_id),
struct task_group, css); struct task_group, css);
#else #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 */ /* 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) 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.cfs_rq = task_group(p)->cfs_rq[cpu];
p->se.parent = task_group(p)->se[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.rt_rq = task_group(p)->rt_rq[cpu];
p->rt.parent = task_group(p)->rt_se[cpu]; p->rt.parent = task_group(p)->rt_se[cpu];
#endif
} }
static inline void lock_doms_cur(void) 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 lock_doms_cur(void) { }
static inline void unlock_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 */ /* CFS-related fields in a runqueue */
struct cfs_rq { struct cfs_rq {
@ -351,7 +370,7 @@ struct cfs_rq {
struct rt_rq { struct rt_rq {
struct rt_prio_array active; struct rt_prio_array active;
unsigned long rt_nr_running; 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 */ int highest_prio; /* highest queued rt task prio */
#endif #endif
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
@ -361,7 +380,7 @@ struct rt_rq {
int rt_throttled; int rt_throttled;
u64 rt_time; u64 rt_time;
#ifdef CONFIG_FAIR_GROUP_SCHED #ifdef CONFIG_RT_GROUP_SCHED
unsigned long rt_nr_boosted; unsigned long rt_nr_boosted;
struct rq *rq; struct rq *rq;
@ -437,6 +456,8 @@ struct rq {
#ifdef CONFIG_FAIR_GROUP_SCHED #ifdef CONFIG_FAIR_GROUP_SCHED
/* list of leaf cfs_rq on this cpu: */ /* list of leaf cfs_rq on this cpu: */
struct list_head leaf_cfs_rq_list; struct list_head leaf_cfs_rq_list;
#endif
#ifdef CONFIG_RT_GROUP_SCHED
struct list_head leaf_rt_rq_list; struct list_head leaf_rt_rq_list;
#endif #endif
@ -7104,7 +7125,7 @@ static void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq)
/* delimiter for bitsearch: */ /* delimiter for bitsearch: */
__set_bit(MAX_RT_PRIO, array->bitmap); __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; rt_rq->highest_prio = MAX_RT_PRIO;
#endif #endif
#ifdef CONFIG_SMP #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_time = 0;
rt_rq->rt_throttled = 0; rt_rq->rt_throttled = 0;
#ifdef CONFIG_FAIR_GROUP_SCHED #ifdef CONFIG_RT_GROUP_SCHED
rt_rq->rt_nr_boosted = 0; rt_rq->rt_nr_boosted = 0;
rt_rq->rq = rq; rt_rq->rq = rq;
#endif #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->load.inv_weight = div64_64(1ULL<<32, se->load.weight);
se->parent = NULL; se->parent = NULL;
} }
#endif
#ifdef CONFIG_RT_GROUP_SCHED
static void init_tg_rt_entry(struct rq *rq, struct task_group *tg, static void init_tg_rt_entry(struct rq *rq, struct task_group *tg,
struct rt_rq *rt_rq, struct sched_rt_entity *rt_se, struct rt_rq *rt_rq, struct sched_rt_entity *rt_se,
int cpu, int add) int cpu, int add)
@ -7168,7 +7191,7 @@ void __init sched_init(void)
init_defrootdomain(); init_defrootdomain();
#endif #endif
#ifdef CONFIG_FAIR_GROUP_SCHED #ifdef CONFIG_GROUP_SCHED
list_add(&init_task_group.list, &task_groups); list_add(&init_task_group.list, &task_groups);
#endif #endif
@ -7189,6 +7212,8 @@ void __init sched_init(void)
&per_cpu(init_cfs_rq, i), &per_cpu(init_cfs_rq, i),
&per_cpu(init_sched_entity, i), i, 1); &per_cpu(init_sched_entity, i), i, 1);
#endif
#ifdef CONFIG_RT_GROUP_SCHED
init_task_group.rt_runtime = init_task_group.rt_runtime =
sysctl_sched_rt_runtime * NSEC_PER_USEC; sysctl_sched_rt_runtime * NSEC_PER_USEC;
INIT_LIST_HEAD(&rq->leaf_rt_rq_list); INIT_LIST_HEAD(&rq->leaf_rt_rq_list);
@ -7381,9 +7406,9 @@ void set_curr_task(int cpu, struct task_struct *p)
#endif #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, * distribute shares of all task groups among their schedulable entities,
* to reflect load distribution across cpus. * to reflect load distribution across cpus.
@ -7539,20 +7564,28 @@ static void free_sched_group(struct task_group *tg)
int i; int i;
for_each_possible_cpu(i) { for_each_possible_cpu(i) {
#ifdef CONFIG_FAIR_GROUP_SCHED
if (tg->cfs_rq) if (tg->cfs_rq)
kfree(tg->cfs_rq[i]); kfree(tg->cfs_rq[i]);
if (tg->se) if (tg->se)
kfree(tg->se[i]); kfree(tg->se[i]);
#endif
#ifdef CONFIG_RT_GROUP_SCHED
if (tg->rt_rq) if (tg->rt_rq)
kfree(tg->rt_rq[i]); kfree(tg->rt_rq[i]);
if (tg->rt_se) if (tg->rt_se)
kfree(tg->rt_se[i]); kfree(tg->rt_se[i]);
#endif
} }
#ifdef CONFIG_FAIR_GROUP_SCHED
kfree(tg->cfs_rq); kfree(tg->cfs_rq);
kfree(tg->se); kfree(tg->se);
#endif
#ifdef CONFIG_RT_GROUP_SCHED
kfree(tg->rt_rq); kfree(tg->rt_rq);
kfree(tg->rt_se); kfree(tg->rt_se);
#endif
kfree(tg); 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 *sched_create_group(void)
{ {
struct task_group *tg; struct task_group *tg;
#ifdef CONFIG_FAIR_GROUP_SCHED
struct cfs_rq *cfs_rq; struct cfs_rq *cfs_rq;
struct sched_entity *se; struct sched_entity *se;
#endif
#ifdef CONFIG_RT_GROUP_SCHED
struct rt_rq *rt_rq; struct rt_rq *rt_rq;
struct sched_rt_entity *rt_se; struct sched_rt_entity *rt_se;
#endif
struct rq *rq; struct rq *rq;
unsigned long flags; unsigned long flags;
int i; int i;
@ -7572,12 +7609,18 @@ struct task_group *sched_create_group(void)
if (!tg) if (!tg)
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);
#ifdef CONFIG_FAIR_GROUP_SCHED
tg->cfs_rq = kzalloc(sizeof(cfs_rq) * NR_CPUS, GFP_KERNEL); tg->cfs_rq = kzalloc(sizeof(cfs_rq) * NR_CPUS, GFP_KERNEL);
if (!tg->cfs_rq) if (!tg->cfs_rq)
goto err; goto err;
tg->se = kzalloc(sizeof(se) * NR_CPUS, GFP_KERNEL); tg->se = kzalloc(sizeof(se) * NR_CPUS, GFP_KERNEL);
if (!tg->se) if (!tg->se)
goto err; goto err;
tg->shares = NICE_0_LOAD;
#endif
#ifdef CONFIG_RT_GROUP_SCHED
tg->rt_rq = kzalloc(sizeof(rt_rq) * NR_CPUS, GFP_KERNEL); tg->rt_rq = kzalloc(sizeof(rt_rq) * NR_CPUS, GFP_KERNEL);
if (!tg->rt_rq) if (!tg->rt_rq)
goto err; goto err;
@ -7585,12 +7628,13 @@ struct task_group *sched_create_group(void)
if (!tg->rt_se) if (!tg->rt_se)
goto err; goto err;
tg->shares = NICE_0_LOAD;
tg->rt_runtime = 0; tg->rt_runtime = 0;
#endif
for_each_possible_cpu(i) { for_each_possible_cpu(i) {
rq = cpu_rq(i); rq = cpu_rq(i);
#ifdef CONFIG_FAIR_GROUP_SCHED
cfs_rq = kmalloc_node(sizeof(struct cfs_rq), cfs_rq = kmalloc_node(sizeof(struct cfs_rq),
GFP_KERNEL|__GFP_ZERO, cpu_to_node(i)); GFP_KERNEL|__GFP_ZERO, cpu_to_node(i));
if (!cfs_rq) if (!cfs_rq)
@ -7601,6 +7645,10 @@ struct task_group *sched_create_group(void)
if (!se) if (!se)
goto err; 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), rt_rq = kmalloc_node(sizeof(struct rt_rq),
GFP_KERNEL|__GFP_ZERO, cpu_to_node(i)); GFP_KERNEL|__GFP_ZERO, cpu_to_node(i));
if (!rt_rq) if (!rt_rq)
@ -7611,17 +7659,21 @@ struct task_group *sched_create_group(void)
if (!rt_se) if (!rt_se)
goto err; 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); init_tg_rt_entry(rq, tg, rt_rq, rt_se, i, 0);
#endif
} }
spin_lock_irqsave(&task_group_lock, flags); spin_lock_irqsave(&task_group_lock, flags);
for_each_possible_cpu(i) { for_each_possible_cpu(i) {
rq = cpu_rq(i); rq = cpu_rq(i);
#ifdef CONFIG_FAIR_GROUP_SCHED
cfs_rq = tg->cfs_rq[i]; cfs_rq = tg->cfs_rq[i];
list_add_rcu(&cfs_rq->leaf_cfs_rq_list, &rq->leaf_cfs_rq_list); 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]; rt_rq = tg->rt_rq[i];
list_add_rcu(&rt_rq->leaf_rt_rq_list, &rq->leaf_rt_rq_list); list_add_rcu(&rt_rq->leaf_rt_rq_list, &rq->leaf_rt_rq_list);
#endif
} }
list_add_rcu(&tg->list, &task_groups); list_add_rcu(&tg->list, &task_groups);
spin_unlock_irqrestore(&task_group_lock, flags); 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 */ /* Destroy runqueue etc associated with a task group */
void sched_destroy_group(struct task_group *tg) void sched_destroy_group(struct task_group *tg)
{ {
struct cfs_rq *cfs_rq = NULL;
struct rt_rq *rt_rq = NULL;
unsigned long flags; unsigned long flags;
int i; int i;
spin_lock_irqsave(&task_group_lock, flags); spin_lock_irqsave(&task_group_lock, flags);
for_each_possible_cpu(i) { for_each_possible_cpu(i) {
cfs_rq = tg->cfs_rq[i]; #ifdef CONFIG_FAIR_GROUP_SCHED
list_del_rcu(&cfs_rq->leaf_cfs_rq_list); list_del_rcu(&tg->cfs_rq[i]->leaf_cfs_rq_list);
rt_rq = tg->rt_rq[i]; #endif
list_del_rcu(&rt_rq->leaf_rt_rq_list); #ifdef CONFIG_RT_GROUP_SCHED
list_del_rcu(&tg->rt_rq[i]->leaf_rt_rq_list);
#endif
} }
list_del_rcu(&tg->list); list_del_rcu(&tg->list);
spin_unlock_irqrestore(&task_group_lock, flags); spin_unlock_irqrestore(&task_group_lock, flags);
BUG_ON(!cfs_rq);
/* wait for possible concurrent references to cfs_rqs complete */ /* wait for possible concurrent references to cfs_rqs complete */
call_rcu(&tg->rcu, free_sched_group_rcu); 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); task_rq_unlock(rq, &flags);
} }
#ifdef CONFIG_FAIR_GROUP_SCHED
/* rq->lock to be locked by caller */ /* rq->lock to be locked by caller */
static void set_se_shares(struct sched_entity *se, unsigned long shares) 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; return tg->shares;
} }
#endif
#ifdef CONFIG_RT_GROUP_SCHED
/* /*
* Ensure that the real time constraints are schedulable. * 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); do_div(rt_runtime_us, NSEC_PER_USEC);
return rt_runtime_us; 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 */ /* return corresponding task_group object of a cgroup */
static inline struct task_group *cgroup_tg(struct cgroup *cgrp) 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); sched_move_task(tsk);
} }
#ifdef CONFIG_FAIR_GROUP_SCHED
static int cpu_shares_write_uint(struct cgroup *cgrp, struct cftype *cftype, static int cpu_shares_write_uint(struct cgroup *cgrp, struct cftype *cftype,
u64 shareval) u64 shareval)
{ {
@ -7932,7 +7987,9 @@ static u64 cpu_shares_read_uint(struct cgroup *cgrp, struct cftype *cft)
return (u64) tg->shares; return (u64) tg->shares;
} }
#endif
#ifdef CONFIG_RT_GROUP_SCHED
static int cpu_rt_runtime_write(struct cgroup *cgrp, struct cftype *cft, static int cpu_rt_runtime_write(struct cgroup *cgrp, struct cftype *cft,
struct file *file, struct file *file,
const char __user *userbuf, 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); return simple_read_from_buffer(buf, nbytes, ppos, tmp, len);
} }
#endif
static struct cftype cpu_files[] = { static struct cftype cpu_files[] = {
#ifdef CONFIG_FAIR_GROUP_SCHED
{ {
.name = "shares", .name = "shares",
.read_uint = cpu_shares_read_uint, .read_uint = cpu_shares_read_uint,
.write_uint = cpu_shares_write_uint, .write_uint = cpu_shares_write_uint,
}, },
#endif
#ifdef CONFIG_RT_GROUP_SCHED
{ {
.name = "rt_runtime_us", .name = "rt_runtime_us",
.read = cpu_rt_runtime_read, .read = cpu_rt_runtime_read,
.write = cpu_rt_runtime_write, .write = cpu_rt_runtime_write,
}, },
#endif
}; };
static int cpu_cgroup_populate(struct cgroup_subsys *ss, struct cgroup *cont) 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, .early_init = 1,
}; };
#endif /* CONFIG_FAIR_CGROUP_SCHED */ #endif /* CONFIG_CGROUP_SCHED */
#ifdef CONFIG_CGROUP_CPUACCT #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); 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) 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) 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); struct rt_rq *rt_rq = group_rt_rq(rt_se);
if (rt_rq) 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))); WARN_ON(!rt_prio(rt_se_prio(rt_se)));
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_se_prio(rt_se) < rt_rq->highest_prio) if (rt_se_prio(rt_se) < rt_rq->highest_prio)
rt_rq->highest_prio = rt_se_prio(rt_se); rt_rq->highest_prio = rt_se_prio(rt_se);
#endif #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)); update_rt_migration(rq_of_rt_rq(rt_rq));
#endif #endif
#ifdef CONFIG_FAIR_GROUP_SCHED #ifdef CONFIG_RT_GROUP_SCHED
if (rt_se_boosted(rt_se)) if (rt_se_boosted(rt_se))
rt_rq->rt_nr_boosted++; rt_rq->rt_nr_boosted++;
#endif #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_prio(rt_se_prio(rt_se)));
WARN_ON(!rt_rq->rt_nr_running); WARN_ON(!rt_rq->rt_nr_running);
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) { if (rt_rq->rt_nr_running) {
struct rt_prio_array *array; 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)); update_rt_migration(rq_of_rt_rq(rt_rq));
#endif /* CONFIG_SMP */ #endif /* CONFIG_SMP */
#ifdef CONFIG_FAIR_GROUP_SCHED #ifdef CONFIG_RT_GROUP_SCHED
if (rt_se_boosted(rt_se)) if (rt_se_boosted(rt_se))
rt_rq->rt_nr_boosted--; 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, .uid_keyring = &root_user_keyring,
.session_keyring = &root_session_keyring, .session_keyring = &root_session_keyring,
#endif #endif
#ifdef CONFIG_FAIR_USER_SCHED #ifdef CONFIG_USER_SCHED
.tg = &init_task_group, .tg = &init_task_group,
#endif #endif
}; };
@ -90,7 +90,7 @@ static struct user_struct *uid_hash_find(uid_t uid, struct hlist_head *hashent)
return NULL; return NULL;
} }
#ifdef CONFIG_FAIR_USER_SCHED #ifdef CONFIG_USER_SCHED
static void sched_destroy_user(struct user_struct *up) 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); sched_move_task(p);
} }
#else /* CONFIG_FAIR_USER_SCHED */ #else /* CONFIG_USER_SCHED */
static void sched_destroy_user(struct user_struct *up) { } static void sched_destroy_user(struct user_struct *up) { }
static int sched_create_user(struct user_struct *up) { return 0; } static int sched_create_user(struct user_struct *up) { return 0; }
static void sched_switch_user(struct task_struct *p) { } 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 struct kset *uids_kset; /* represents the /sys/kernel/uids/ directory */
static DEFINE_MUTEX(uids_mutex); static DEFINE_MUTEX(uids_mutex);
@ -137,6 +137,7 @@ static inline void uids_mutex_unlock(void)
} }
/* uid directory attributes */ /* uid directory attributes */
#ifdef CONFIG_FAIR_GROUP_SCHED
static ssize_t cpu_shares_show(struct kobject *kobj, static ssize_t cpu_shares_show(struct kobject *kobj,
struct kobj_attribute *attr, struct kobj_attribute *attr,
char *buf) char *buf)
@ -163,7 +164,9 @@ static ssize_t cpu_shares_store(struct kobject *kobj,
static struct kobj_attribute cpu_share_attr = static struct kobj_attribute cpu_share_attr =
__ATTR(cpu_share, 0644, cpu_shares_show, cpu_shares_store); __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, static ssize_t cpu_rt_runtime_show(struct kobject *kobj,
struct kobj_attribute *attr, struct kobj_attribute *attr,
char *buf) char *buf)
@ -190,11 +193,16 @@ static ssize_t cpu_rt_runtime_store(struct kobject *kobj,
static struct kobj_attribute cpu_rt_runtime_attr = static struct kobj_attribute cpu_rt_runtime_attr =
__ATTR(cpu_rt_runtime, 0644, cpu_rt_runtime_show, cpu_rt_runtime_store); __ATTR(cpu_rt_runtime, 0644, cpu_rt_runtime_show, cpu_rt_runtime_store);
#endif
/* default attributes per uid directory */ /* default attributes per uid directory */
static struct attribute *uids_attributes[] = { static struct attribute *uids_attributes[] = {
#ifdef CONFIG_FAIR_GROUP_SCHED
&cpu_share_attr.attr, &cpu_share_attr.attr,
#endif
#ifdef CONFIG_RT_GROUP_SCHED
&cpu_rt_runtime_attr.attr, &cpu_rt_runtime_attr.attr,
#endif
NULL NULL
}; };
@ -297,7 +305,7 @@ static inline void free_user(struct user_struct *up, unsigned long flags)
schedule_work(&up->work); schedule_work(&up->work);
} }
#else /* CONFIG_FAIR_USER_SCHED && CONFIG_SYSFS */ #else /* CONFIG_USER_SCHED && CONFIG_SYSFS */
int uids_sysfs_init(void) { return 0; } int uids_sysfs_init(void) { return 0; }
static inline int uids_user_create(struct user_struct *up) { 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); spin_lock_irq(&uidhash_lock);
up = uid_hash_find(uid, hashent); up = uid_hash_find(uid, hashent);
if (up) { 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 * is defined, since we serialize alloc_uid() using
* uids_mutex. Hence no need to call * uids_mutex. Hence no need to call
* sched_destroy_user() or remove_user_sysfs_dir(). * sched_destroy_user() or remove_user_sysfs_dir().