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authorDhaval Giani <dhaval@linux.vnet.ibm.com>2008-04-19 19:44:59 +0200
committerIngo Molnar <mingo@elte.hu>2008-04-19 19:44:59 +0200
commit354d60c2ff72d86627dfe2089d186824abf4bb8e (patch)
tree10cea61ce7036448ed7246820c5575df2a61bb3b /kernel
parentea736ed5d353d7a3aa1cf8ce4cf8d947bc353fb2 (diff)
sched: mix tasks and groups
This patch allows tasks and groups to exist in the same cfs_rq. With this change the CFS group scheduling follows a 1/(M+N) model from a 1/(1+N) fairness model where M tasks and N groups exist at the cfs_rq level. [a.p.zijlstra@chello.nl: rt bits and assorted fixes] Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com> Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched.c51
-rw-r--r--kernel/sched_fair.c51
-rw-r--r--kernel/sched_rt.c15
3 files changed, 103 insertions, 14 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 62830eaec52..1b7399dfa36 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -273,6 +273,7 @@ struct task_group {
struct list_head list;
};
+#ifdef CONFIG_USER_SCHED
#ifdef CONFIG_FAIR_GROUP_SCHED
/* Default task group's sched entity on each cpu */
static DEFINE_PER_CPU(struct sched_entity, init_sched_entity);
@@ -284,6 +285,7 @@ static DEFINE_PER_CPU(struct cfs_rq, init_cfs_rq) ____cacheline_aligned_in_smp;
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;
#endif
+#endif
/* task_group_lock serializes add/remove of task groups and also changes to
* a task group's cpu shares.
@@ -7447,6 +7449,10 @@ static void init_tg_cfs_entry(struct rq *rq, struct task_group *tg,
list_add(&cfs_rq->leaf_cfs_rq_list, &rq->leaf_cfs_rq_list);
tg->se[cpu] = se;
+ /* se could be NULL for init_task_group */
+ if (!se)
+ return;
+
se->cfs_rq = &rq->cfs;
se->my_q = cfs_rq;
se->load.weight = tg->shares;
@@ -7469,6 +7475,9 @@ static void init_tg_rt_entry(struct rq *rq, struct task_group *tg,
list_add(&rt_rq->leaf_rt_rq_list, &rq->leaf_rt_rq_list);
tg->rt_se[cpu] = rt_se;
+ if (!rt_se)
+ return;
+
rt_se->rt_rq = &rq->rt;
rt_se->my_q = rt_rq;
rt_se->parent = NULL;
@@ -7539,18 +7548,56 @@ void __init sched_init(void)
#ifdef CONFIG_FAIR_GROUP_SCHED
init_task_group.shares = init_task_group_load;
INIT_LIST_HEAD(&rq->leaf_cfs_rq_list);
+#ifdef CONFIG_CGROUP_SCHED
+ /*
+ * How much cpu bandwidth does init_task_group get?
+ *
+ * In case of task-groups formed thr' the cgroup filesystem, it
+ * gets 100% of the cpu resources in the system. This overall
+ * system cpu resource is divided among the tasks of
+ * init_task_group and its child task-groups in a fair manner,
+ * based on each entity's (task or task-group's) weight
+ * (se->load.weight).
+ *
+ * In other words, if init_task_group has 10 tasks of weight
+ * 1024) and two child groups A0 and A1 (of weight 1024 each),
+ * then A0's share of the cpu resource is:
+ *
+ * A0's bandwidth = 1024 / (10*1024 + 1024 + 1024) = 8.33%
+ *
+ * We achieve this by letting init_task_group's tasks sit
+ * directly in rq->cfs (i.e init_task_group->se[] = NULL).
+ */
+ init_tg_cfs_entry(rq, &init_task_group, &rq->cfs, NULL, i, 1);
+#elif defined CONFIG_USER_SCHED
+ /*
+ * In case of task-groups formed thr' the user id of tasks,
+ * init_task_group represents tasks belonging to root user.
+ * Hence it forms a sibling of all subsequent groups formed.
+ * In this case, init_task_group gets only a fraction of overall
+ * system cpu resource, based on the weight assigned to root
+ * user's cpu share (INIT_TASK_GROUP_LOAD). This is accomplished
+ * by letting tasks of init_task_group sit in a separate cfs_rq
+ * (init_cfs_rq) and having one entity represent this group of
+ * tasks in rq->cfs (i.e init_task_group->se[] != NULL).
+ */
init_tg_cfs_entry(rq, &init_task_group,
&per_cpu(init_cfs_rq, i),
&per_cpu(init_sched_entity, i), i, 1);
#endif
+#endif /* CONFIG_FAIR_GROUP_SCHED */
+
+ rq->rt.rt_runtime = def_rt_bandwidth.rt_runtime;
#ifdef CONFIG_RT_GROUP_SCHED
INIT_LIST_HEAD(&rq->leaf_rt_rq_list);
+#ifdef CONFIG_CGROUP_SCHED
+ init_tg_rt_entry(rq, &init_task_group, &rq->rt, NULL, i, 1);
+#elif defined CONFIG_USER_SCHED
init_tg_rt_entry(rq, &init_task_group,
&per_cpu(init_rt_rq, i),
&per_cpu(init_sched_rt_entity, i), i, 1);
-#else
- rq->rt.rt_runtime = def_rt_bandwidth.rt_runtime;
+#endif
#endif
for (j = 0; j < CPU_LOAD_IDX_MAX; j++)
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 022e036f2c3..3dde0f0ec93 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1133,6 +1133,17 @@ wakeup_preempt_entity(struct sched_entity *curr, struct sched_entity *se)
return 0;
}
+/* return depth at which a sched entity is present in the hierarchy */
+static inline int depth_se(struct sched_entity *se)
+{
+ int depth = 0;
+
+ for_each_sched_entity(se)
+ depth++;
+
+ return depth;
+}
+
/*
* Preempt the current task with a newly woken task if needed:
*/
@@ -1141,6 +1152,7 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p)
struct task_struct *curr = rq->curr;
struct cfs_rq *cfs_rq = task_cfs_rq(curr);
struct sched_entity *se = &curr->se, *pse = &p->se;
+ int se_depth, pse_depth;
if (unlikely(rt_prio(p->prio))) {
update_rq_clock(rq);
@@ -1165,6 +1177,27 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p)
if (!sched_feat(WAKEUP_PREEMPT))
return;
+ /*
+ * preemption test can be made between sibling entities who are in the
+ * same cfs_rq i.e who have a common parent. Walk up the hierarchy of
+ * both tasks until we find their ancestors who are siblings of common
+ * parent.
+ */
+
+ /* First walk up until both entities are at same depth */
+ se_depth = depth_se(se);
+ pse_depth = depth_se(pse);
+
+ while (se_depth > pse_depth) {
+ se_depth--;
+ se = parent_entity(se);
+ }
+
+ while (pse_depth > se_depth) {
+ pse_depth--;
+ pse = parent_entity(pse);
+ }
+
while (!is_same_group(se, pse)) {
se = parent_entity(se);
pse = parent_entity(pse);
@@ -1223,13 +1256,22 @@ static void put_prev_task_fair(struct rq *rq, struct task_struct *prev)
static struct task_struct *
__load_balance_iterator(struct cfs_rq *cfs_rq, struct rb_node *curr)
{
- struct task_struct *p;
+ struct task_struct *p = NULL;
+ struct sched_entity *se;
if (!curr)
return NULL;
- p = rb_entry(curr, struct task_struct, se.run_node);
- cfs_rq->rb_load_balance_curr = rb_next(curr);
+ /* Skip over entities that are not tasks */
+ do {
+ se = rb_entry(curr, struct sched_entity, run_node);
+ curr = rb_next(curr);
+ } while (curr && !entity_is_task(se));
+
+ cfs_rq->rb_load_balance_curr = curr;
+
+ if (entity_is_task(se))
+ p = task_of(se);
return p;
}
@@ -1489,9 +1531,6 @@ static void print_cfs_stats(struct seq_file *m, int cpu)
{
struct cfs_rq *cfs_rq;
-#ifdef CONFIG_FAIR_GROUP_SCHED
- print_cfs_rq(m, cpu, &cpu_rq(cpu)->cfs);
-#endif
rcu_read_lock();
for_each_leaf_cfs_rq(cpu_rq(cpu), cfs_rq)
print_cfs_rq(m, cpu, cfs_rq);
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 8ff824565e0..201a69382a4 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -374,11 +374,15 @@ static void update_curr_rt(struct rq *rq)
curr->se.exec_start = rq->clock;
cpuacct_charge(curr, delta_exec);
- spin_lock(&rt_rq->rt_runtime_lock);
- rt_rq->rt_time += delta_exec;
- if (sched_rt_runtime_exceeded(rt_rq))
- resched_task(curr);
- spin_unlock(&rt_rq->rt_runtime_lock);
+ for_each_sched_rt_entity(rt_se) {
+ rt_rq = rt_rq_of_se(rt_se);
+
+ spin_lock(&rt_rq->rt_runtime_lock);
+ rt_rq->rt_time += delta_exec;
+ if (sched_rt_runtime_exceeded(rt_rq))
+ resched_task(curr);
+ spin_unlock(&rt_rq->rt_runtime_lock);
+ }
}
static inline
@@ -477,7 +481,6 @@ static void dequeue_rt_entity(struct sched_rt_entity *rt_se)
* entries, we must remove entries top - down.
*
* XXX: O(1/2 h^2) because we can only walk up, not down the chain.
- * doesn't matter much for now, as h=2 for GROUP_SCHED.
*/
static void dequeue_rt_stack(struct task_struct *p)
{