提交 9b5b7751 编写于 作者: S Srivatsa Vaddagiri 提交者: Ingo Molnar

sched: clean up code under CONFIG_FAIR_GROUP_SCHED

With the view of supporting user-id based fair scheduling (and not just
container-based fair scheduling), this patch renames several functions
and makes them independent of whether they are being used for container
or user-id based fair scheduling.

Also fix a problem reported by KAMEZAWA Hiroyuki (wrt allocating
less-sized array for tg->cfs_rq[] and tf->se[]).
Signed-off-by: NSrivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Signed-off-by: NDhaval Giani <dhaval@linux.vnet.ibm.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Reviewed-by: NThomas Gleixner <tglx@linutronix.de>
上级 75c28ace
......@@ -136,6 +136,7 @@ extern unsigned long weighted_cpuload(const int cpu);
struct seq_file;
struct cfs_rq;
struct task_grp;
#ifdef CONFIG_SCHED_DEBUG
extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
extern void proc_sched_set_task(struct task_struct *p);
......@@ -1834,6 +1835,17 @@ extern int sched_mc_power_savings, sched_smt_power_savings;
extern void normalize_rt_tasks(void);
#ifdef CONFIG_FAIR_GROUP_SCHED
extern struct task_grp init_task_grp;
extern struct task_grp *sched_create_group(void);
extern void sched_destroy_group(struct task_grp *tg);
extern void sched_move_task(struct task_struct *tsk);
extern int sched_group_set_shares(struct task_grp *tg, unsigned long shares);
#endif
#ifdef CONFIG_TASK_XACCT
static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
{
......
......@@ -282,13 +282,12 @@ config CPUSETS
Say N if unsure.
config FAIR_GROUP_SCHED
bool "Fair group scheduler"
depends on EXPERIMENTAL && CONTAINERS
bool "Fair group cpu scheduler"
default n
depends on EXPERIMENTAL
help
This option enables you to group tasks and control CPU resource
allocation to such groups.
Say N if unsure.
This feature lets cpu scheduler recognize task groups and control cpu
bandwidth allocation to such task groups.
config SYSFS_DEPRECATED
bool "Create deprecated sysfs files"
......
......@@ -173,13 +173,10 @@ struct rt_prio_array {
#ifdef CONFIG_FAIR_GROUP_SCHED
#include <linux/container.h>
struct cfs_rq;
/* task group related information */
struct task_grp {
struct container_subsys_state css;
/* schedulable entities of this group on each cpu */
struct sched_entity **se;
/* runqueue "owned" by this group on each cpu */
......@@ -192,22 +189,28 @@ 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[CONFIG_NR_CPUS];
static struct cfs_rq *init_cfs_rq_p[CONFIG_NR_CPUS];
static struct sched_entity *init_sched_entity_p[NR_CPUS];
static struct cfs_rq *init_cfs_rq_p[NR_CPUS];
/* Default task group.
* Every task in system belong to this group at bootup.
*/
static struct task_grp init_task_grp = {
.se = init_sched_entity_p,
.cfs_rq = init_cfs_rq_p,
};
struct task_grp init_task_grp = {
.se = init_sched_entity_p,
.cfs_rq = init_cfs_rq_p,
};
#define INIT_TASK_GRP_LOAD NICE_0_LOAD
static int init_task_grp_load = INIT_TASK_GRP_LOAD;
/* return group to which a task belongs */
static inline struct task_grp *task_grp(struct task_struct *p)
{
return container_of(task_subsys_state(p, cpu_subsys_id),
struct task_grp, css);
struct task_grp *tg;
tg = &init_task_grp;
return tg;
}
/* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */
......@@ -250,6 +253,7 @@ struct cfs_rq {
*/
struct list_head leaf_cfs_rq_list; /* Better name : task_cfs_rq_list? */
struct task_grp *tg; /* group that "owns" this runqueue */
struct rcu_head rcu;
#endif
};
......@@ -6513,11 +6517,12 @@ void __init sched_init(void)
init_sched_entity_p[i] = se;
se->cfs_rq = &rq->cfs;
se->my_q = cfs_rq;
se->load.weight = NICE_0_LOAD;
se->load.inv_weight = div64_64(1ULL<<32, NICE_0_LOAD);
se->load.weight = init_task_grp_load;
se->load.inv_weight =
div64_64(1ULL<<32, init_task_grp_load);
se->parent = NULL;
}
init_task_grp.shares = NICE_0_LOAD;
init_task_grp.shares = init_task_grp_load;
#endif
for (j = 0; j < CPU_LOAD_IDX_MAX; j++)
......@@ -6707,45 +6712,28 @@ void set_curr_task(int cpu, struct task_struct *p)
#ifdef CONFIG_FAIR_GROUP_SCHED
/* return corresponding task_grp object of a container */
static inline struct task_grp *container_tg(struct container *cont)
{
return container_of(container_subsys_state(cont, cpu_subsys_id),
struct task_grp, css);
}
/* allocate runqueue etc for a new task group */
static struct container_subsys_state *
sched_create_group(struct container_subsys *ss, struct container *cont)
struct task_grp *sched_create_group(void)
{
struct task_grp *tg;
struct cfs_rq *cfs_rq;
struct sched_entity *se;
struct rq *rq;
int i;
if (!cont->parent) {
/* This is early initialization for the top container */
init_task_grp.css.container = cont;
return &init_task_grp.css;
}
/* we support only 1-level deep hierarchical scheduler atm */
if (cont->parent->parent)
return ERR_PTR(-EINVAL);
tg = kzalloc(sizeof(*tg), GFP_KERNEL);
if (!tg)
return ERR_PTR(-ENOMEM);
tg->cfs_rq = kzalloc(sizeof(cfs_rq) * num_possible_cpus(), GFP_KERNEL);
tg->cfs_rq = kzalloc(sizeof(cfs_rq) * NR_CPUS, GFP_KERNEL);
if (!tg->cfs_rq)
goto err;
tg->se = kzalloc(sizeof(se) * num_possible_cpus(), GFP_KERNEL);
tg->se = kzalloc(sizeof(se) * NR_CPUS, GFP_KERNEL);
if (!tg->se)
goto err;
for_each_possible_cpu(i) {
struct rq *rq = cpu_rq(i);
rq = cpu_rq(i);
cfs_rq = kmalloc_node(sizeof(struct cfs_rq), GFP_KERNEL,
cpu_to_node(i));
......@@ -6763,7 +6751,6 @@ sched_create_group(struct container_subsys *ss, struct container *cont)
tg->cfs_rq[i] = cfs_rq;
init_cfs_rq(cfs_rq, rq);
cfs_rq->tg = tg;
list_add_rcu(&cfs_rq->leaf_cfs_rq_list, &rq->leaf_cfs_rq_list);
tg->se[i] = se;
se->cfs_rq = &rq->cfs;
......@@ -6773,12 +6760,15 @@ sched_create_group(struct container_subsys *ss, struct container *cont)
se->parent = NULL;
}
tg->shares = NICE_0_LOAD;
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);
}
/* Bind the container to task_grp object we just created */
tg->css.container = cont;
tg->shares = NICE_0_LOAD;
return &tg->css;
return tg;
err:
for_each_possible_cpu(i) {
......@@ -6797,24 +6787,14 @@ sched_create_group(struct container_subsys *ss, struct container *cont)
return ERR_PTR(-ENOMEM);
}
/* destroy runqueue etc associated with a task group */
static void sched_destroy_group(struct container_subsys *ss,
struct container *cont)
/* rcu callback to free various structures associated with a task group */
static void free_sched_group(struct rcu_head *rhp)
{
struct task_grp *tg = container_tg(cont);
struct cfs_rq *cfs_rq;
struct cfs_rq *cfs_rq = container_of(rhp, struct cfs_rq, rcu);
struct task_grp *tg = cfs_rq->tg;
struct sched_entity *se;
int i;
for_each_possible_cpu(i) {
cfs_rq = tg->cfs_rq[i];
list_del_rcu(&cfs_rq->leaf_cfs_rq_list);
}
/* wait for possible concurrent references to cfs_rqs complete */
synchronize_sched();
/* now it should be safe to free those cfs_rqs */
for_each_possible_cpu(i) {
cfs_rq = tg->cfs_rq[i];
......@@ -6829,19 +6809,29 @@ static void sched_destroy_group(struct container_subsys *ss,
kfree(tg);
}
static int sched_can_attach(struct container_subsys *ss,
struct container *cont, struct task_struct *tsk)
/* Destroy runqueue etc associated with a task group */
void sched_destroy_group(struct task_grp *tg)
{
/* We don't support RT-tasks being in separate groups */
if (tsk->sched_class != &fair_sched_class)
return -EINVAL;
struct cfs_rq *cfs_rq;
int i;
return 0;
for_each_possible_cpu(i) {
cfs_rq = tg->cfs_rq[i];
list_del_rcu(&cfs_rq->leaf_cfs_rq_list);
}
cfs_rq = tg->cfs_rq[0];
/* wait for possible concurrent references to cfs_rqs complete */
call_rcu(&cfs_rq->rcu, free_sched_group);
}
/* change task's runqueue when it moves between groups */
static void sched_move_task(struct container_subsys *ss, struct container *cont,
struct container *old_cont, struct task_struct *tsk)
/* change task's runqueue when it moves between groups.
* The caller of this function should have put the task in its new group
* by now. This function just updates tsk->se.cfs_rq and tsk->se.parent to
* reflect its new group.
*/
void sched_move_task(struct task_struct *tsk)
{
int on_rq, running;
unsigned long flags;
......@@ -6896,58 +6886,20 @@ static void set_se_shares(struct sched_entity *se, unsigned long shares)
spin_unlock_irq(&rq->lock);
}
static ssize_t cpu_shares_write(struct container *cont, struct cftype *cftype,
struct file *file, const char __user *userbuf,
size_t nbytes, loff_t *ppos)
int sched_group_set_shares(struct task_grp *tg, unsigned long shares)
{
int i;
unsigned long shareval;
struct task_grp *tg = container_tg(cont);
char buffer[2*sizeof(unsigned long) + 1];
if (nbytes > 2*sizeof(unsigned long)) /* safety check */
return -E2BIG;
if (copy_from_user(buffer, userbuf, nbytes))
return -EFAULT;
if (tg->shares == shares)
return 0;
buffer[nbytes] = 0; /* nul-terminate */
shareval = simple_strtoul(buffer, NULL, 10);
/* return -EINVAL if the new value is not sane */
tg->shares = shareval;
tg->shares = shares;
for_each_possible_cpu(i)
set_se_shares(tg->se[i], shareval);
return nbytes;
}
static u64 cpu_shares_read_uint(struct container *cont, struct cftype *cft)
{
struct task_grp *tg = container_tg(cont);
return (u64) tg->shares;
}
set_se_shares(tg->se[i], shares);
struct cftype cpuctl_share = {
.name = "shares",
.read_uint = cpu_shares_read_uint,
.write = cpu_shares_write,
};
static int sched_populate(struct container_subsys *ss, struct container *cont)
{
return container_add_file(cont, ss, &cpuctl_share);
return 0;
}
struct container_subsys cpu_subsys = {
.name = "cpu",
.create = sched_create_group,
.destroy = sched_destroy_group,
.can_attach = sched_can_attach,
.attach = sched_move_task,
.populate = sched_populate,
.subsys_id = cpu_subsys_id,
.early_init = 1,
};
#endif /* CONFIG_FAIR_GROUP_SCHED */
#endif /* CONFIG_FAIR_GROUP_SCHED */
......@@ -877,7 +877,10 @@ static int cfs_rq_best_prio(struct cfs_rq *cfs_rq)
if (!cfs_rq->nr_running)
return MAX_PRIO;
curr = __pick_next_entity(cfs_rq);
curr = cfs_rq->curr;
if (!curr)
curr = __pick_next_entity(cfs_rq);
p = task_of(curr);
return p->prio;
......
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