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sched: fix build error in kernel/sched_rt.c when RT_GROUP_SCHED && !SMP
Ingo found a build error in the scheduler when RT_GROUP_SCHED was enabled, but SMP was not. This patch rearranges the code such that it is a little more streamlined and compiles under all permutations of SMP, UP and RT_GROUP_SCHED. It was boot tested on my 4-way x86_64 and it still passes preempt-test. Signed-off-by: Gregory Haskins <ghaskins@novell.com>
This commit is contained in:
Gregory Haskins
parent
b07430ac37
commit
398a153b16
2 changed files with 176 additions and 96 deletions
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@ -466,7 +466,9 @@ struct rt_rq {
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#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
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struct {
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int curr; /* highest queued rt task prio */
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#ifdef CONFIG_SMP
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int next; /* next highest */
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#endif
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} highest_prio;
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#endif
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#ifdef CONFIG_SMP
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@ -8267,8 +8269,10 @@ static void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq)
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#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
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rt_rq->highest_prio.curr = MAX_RT_PRIO;
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#ifdef CONFIG_SMP
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rt_rq->highest_prio.next = MAX_RT_PRIO;
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#endif
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#endif
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#ifdef CONFIG_SMP
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rt_rq->rt_nr_migratory = 0;
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rt_rq->overloaded = 0;
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@ -3,6 +3,40 @@
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* policies)
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*/
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static inline struct task_struct *rt_task_of(struct sched_rt_entity *rt_se)
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{
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return container_of(rt_se, struct task_struct, rt);
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}
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#ifdef CONFIG_RT_GROUP_SCHED
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static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq)
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{
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return rt_rq->rq;
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}
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static inline struct rt_rq *rt_rq_of_se(struct sched_rt_entity *rt_se)
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{
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return rt_se->rt_rq;
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}
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#else /* CONFIG_RT_GROUP_SCHED */
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static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq)
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{
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return container_of(rt_rq, struct rq, rt);
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}
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static inline struct rt_rq *rt_rq_of_se(struct sched_rt_entity *rt_se)
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{
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struct task_struct *p = rt_task_of(rt_se);
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struct rq *rq = task_rq(p);
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return &rq->rt;
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}
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#endif /* CONFIG_RT_GROUP_SCHED */
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#ifdef CONFIG_SMP
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static inline int rt_overloaded(struct rq *rq)
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@ -37,19 +71,35 @@ static inline void rt_clear_overload(struct rq *rq)
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cpumask_clear_cpu(rq->cpu, rq->rd->rto_mask);
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}
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static void update_rt_migration(struct rq *rq)
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static void update_rt_migration(struct rt_rq *rt_rq)
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{
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if (rq->rt.rt_nr_migratory && (rq->rt.rt_nr_running > 1)) {
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if (!rq->rt.overloaded) {
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rt_set_overload(rq);
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rq->rt.overloaded = 1;
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if (rt_rq->rt_nr_migratory && (rt_rq->rt_nr_running > 1)) {
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if (!rt_rq->overloaded) {
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rt_set_overload(rq_of_rt_rq(rt_rq));
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rt_rq->overloaded = 1;
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}
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} else if (rq->rt.overloaded) {
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rt_clear_overload(rq);
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rq->rt.overloaded = 0;
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} else if (rt_rq->overloaded) {
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rt_clear_overload(rq_of_rt_rq(rt_rq));
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rt_rq->overloaded = 0;
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}
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}
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static void inc_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
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{
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if (rt_se->nr_cpus_allowed > 1)
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rt_rq->rt_nr_migratory++;
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update_rt_migration(rt_rq);
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}
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static void dec_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
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{
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if (rt_se->nr_cpus_allowed > 1)
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rt_rq->rt_nr_migratory--;
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update_rt_migration(rt_rq);
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}
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static void enqueue_pushable_task(struct rq *rq, struct task_struct *p)
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{
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plist_del(&p->pushable_tasks, &rq->rt.pushable_tasks);
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@ -68,14 +118,13 @@ static inline
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void enqueue_pushable_task(struct rq *rq, struct task_struct *p) {}
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static inline
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void dequeue_pushable_task(struct rq *rq, struct task_struct *p) {}
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static inline
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void inc_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq) {}
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static inline
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void dec_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq) {}
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#endif /* CONFIG_SMP */
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static inline struct task_struct *rt_task_of(struct sched_rt_entity *rt_se)
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{
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return container_of(rt_se, struct task_struct, rt);
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}
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static inline int on_rt_rq(struct sched_rt_entity *rt_se)
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{
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return !list_empty(&rt_se->run_list);
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@ -99,16 +148,6 @@ static inline u64 sched_rt_period(struct rt_rq *rt_rq)
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#define for_each_leaf_rt_rq(rt_rq, rq) \
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list_for_each_entry_rcu(rt_rq, &rq->leaf_rt_rq_list, leaf_rt_rq_list)
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static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq)
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{
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return rt_rq->rq;
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}
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static inline struct rt_rq *rt_rq_of_se(struct sched_rt_entity *rt_se)
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{
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return rt_se->rt_rq;
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}
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#define for_each_sched_rt_entity(rt_se) \
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for (; rt_se; rt_se = rt_se->parent)
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@ -196,19 +235,6 @@ static inline u64 sched_rt_period(struct rt_rq *rt_rq)
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#define for_each_leaf_rt_rq(rt_rq, rq) \
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for (rt_rq = &rq->rt; rt_rq; rt_rq = NULL)
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static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq)
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{
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return container_of(rt_rq, struct rq, rt);
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}
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static inline struct rt_rq *rt_rq_of_se(struct sched_rt_entity *rt_se)
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{
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struct task_struct *p = rt_task_of(rt_se);
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struct rq *rq = task_rq(p);
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return &rq->rt;
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}
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#define for_each_sched_rt_entity(rt_se) \
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for (; rt_se; rt_se = NULL)
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@ -567,7 +593,7 @@ static void update_curr_rt(struct rq *rq)
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}
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}
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#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
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#if defined CONFIG_SMP
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static struct task_struct *pick_next_highest_task_rt(struct rq *rq, int cpu);
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@ -580,33 +606,24 @@ static inline int next_prio(struct rq *rq)
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else
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return MAX_RT_PRIO;
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}
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#endif
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static inline
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void inc_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
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static void
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inc_rt_prio_smp(struct rt_rq *rt_rq, int prio, int prev_prio)
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{
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int prio = rt_se_prio(rt_se);
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#ifdef CONFIG_SMP
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struct rq *rq = rq_of_rt_rq(rt_rq);
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#endif
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WARN_ON(!rt_prio(prio));
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rt_rq->rt_nr_running++;
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#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
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if (prio < rt_rq->highest_prio.curr) {
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if (prio < prev_prio) {
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/*
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* If the new task is higher in priority than anything on the
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* run-queue, we have a new high that must be published to
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* the world. We also know that the previous high becomes
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* our next-highest.
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* run-queue, we know that the previous high becomes our
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* next-highest.
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*/
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rt_rq->highest_prio.next = rt_rq->highest_prio.curr;
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rt_rq->highest_prio.curr = prio;
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#ifdef CONFIG_SMP
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rt_rq->highest_prio.next = prev_prio;
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if (rq->online)
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cpupri_set(&rq->rd->cpupri, rq->cpu, prio);
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#endif
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} else if (prio == rt_rq->highest_prio.curr)
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/*
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* If the next task is equal in priority to the highest on
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@ -619,72 +636,131 @@ void inc_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
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* Otherwise, we need to recompute next-highest
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*/
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rt_rq->highest_prio.next = next_prio(rq);
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#endif
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#ifdef CONFIG_SMP
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if (rt_se->nr_cpus_allowed > 1)
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rq->rt.rt_nr_migratory++;
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update_rt_migration(rq);
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#endif
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#ifdef CONFIG_RT_GROUP_SCHED
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if (rt_se_boosted(rt_se))
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rt_rq->rt_nr_boosted++;
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if (rt_rq->tg)
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start_rt_bandwidth(&rt_rq->tg->rt_bandwidth);
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#else
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start_rt_bandwidth(&def_rt_bandwidth);
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#endif
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}
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static inline
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void dec_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
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static void
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dec_rt_prio_smp(struct rt_rq *rt_rq, int prio, int prev_prio)
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{
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#ifdef CONFIG_SMP
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struct rq *rq = rq_of_rt_rq(rt_rq);
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int highest_prio = rt_rq->highest_prio.curr;
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#endif
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WARN_ON(!rt_prio(rt_se_prio(rt_se)));
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WARN_ON(!rt_rq->rt_nr_running);
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rt_rq->rt_nr_running--;
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if (rt_rq->rt_nr_running && (prio <= rt_rq->highest_prio.next))
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rt_rq->highest_prio.next = next_prio(rq);
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if (rq->online && rt_rq->highest_prio.curr != prev_prio)
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cpupri_set(&rq->rd->cpupri, rq->cpu, rt_rq->highest_prio.curr);
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}
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#else /* CONFIG_SMP */
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static inline
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void inc_rt_prio_smp(struct rt_rq *rt_rq, int prio, int prev_prio) {}
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static inline
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void dec_rt_prio_smp(struct rt_rq *rt_rq, int prio, int prev_prio) {}
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#endif /* CONFIG_SMP */
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#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
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if (rt_rq->rt_nr_running) {
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int prio = rt_se_prio(rt_se);
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static void
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inc_rt_prio(struct rt_rq *rt_rq, int prio)
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{
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int prev_prio = rt_rq->highest_prio.curr;
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WARN_ON(prio < rt_rq->highest_prio.curr);
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if (prio < prev_prio)
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rt_rq->highest_prio.curr = prio;
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inc_rt_prio_smp(rt_rq, prio, prev_prio);
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}
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static void
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dec_rt_prio(struct rt_rq *rt_rq, int prio)
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{
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int prev_prio = rt_rq->highest_prio.curr;
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if (rt_rq->rt_nr_running) {
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WARN_ON(prio < prev_prio);
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/*
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* This may have been our highest or next-highest priority
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* task and therefore we may have some recomputation to do
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* This may have been our highest task, and therefore
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* we may have some recomputation to do
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*/
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if (prio == rt_rq->highest_prio.curr) {
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if (prio == prev_prio) {
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struct rt_prio_array *array = &rt_rq->active;
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rt_rq->highest_prio.curr =
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sched_find_first_bit(array->bitmap);
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}
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if (prio <= rt_rq->highest_prio.next)
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rt_rq->highest_prio.next = next_prio(rq);
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} else
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rt_rq->highest_prio.curr = MAX_RT_PRIO;
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#endif
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#ifdef CONFIG_SMP
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if (rt_se->nr_cpus_allowed > 1)
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rq->rt.rt_nr_migratory--;
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if (rq->online && rt_rq->highest_prio.curr != highest_prio)
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cpupri_set(&rq->rd->cpupri, rq->cpu, rt_rq->highest_prio.curr);
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dec_rt_prio_smp(rt_rq, prio, prev_prio);
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}
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#else
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static inline void inc_rt_prio(struct rt_rq *rt_rq, int prio) {}
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static inline void dec_rt_prio(struct rt_rq *rt_rq, int prio) {}
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#endif /* CONFIG_SMP || CONFIG_RT_GROUP_SCHED */
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update_rt_migration(rq);
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#endif /* CONFIG_SMP */
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#ifdef CONFIG_RT_GROUP_SCHED
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static void
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inc_rt_group(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
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{
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if (rt_se_boosted(rt_se))
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rt_rq->rt_nr_boosted++;
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if (rt_rq->tg)
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start_rt_bandwidth(&rt_rq->tg->rt_bandwidth);
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}
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static void
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dec_rt_group(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
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{
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if (rt_se_boosted(rt_se))
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rt_rq->rt_nr_boosted--;
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WARN_ON(!rt_rq->rt_nr_running && rt_rq->rt_nr_boosted);
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#endif
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}
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#else /* CONFIG_RT_GROUP_SCHED */
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static void
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inc_rt_group(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
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{
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start_rt_bandwidth(&def_rt_bandwidth);
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}
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static inline
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void dec_rt_group(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq) {}
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#endif /* CONFIG_RT_GROUP_SCHED */
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static inline
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void inc_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
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{
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int prio = rt_se_prio(rt_se);
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WARN_ON(!rt_prio(prio));
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rt_rq->rt_nr_running++;
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inc_rt_prio(rt_rq, prio);
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inc_rt_migration(rt_se, rt_rq);
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inc_rt_group(rt_se, rt_rq);
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}
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static inline
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void dec_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
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{
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WARN_ON(!rt_prio(rt_se_prio(rt_se)));
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WARN_ON(!rt_rq->rt_nr_running);
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rt_rq->rt_nr_running--;
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dec_rt_prio(rt_rq, rt_se_prio(rt_se));
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dec_rt_migration(rt_se, rt_rq);
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dec_rt_group(rt_se, rt_rq);
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}
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static void __enqueue_rt_entity(struct sched_rt_entity *rt_se)
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@ -1453,7 +1529,7 @@ static void set_cpus_allowed_rt(struct task_struct *p,
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rq->rt.rt_nr_migratory--;
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}
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update_rt_migration(rq);
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update_rt_migration(&rq->rt);
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}
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cpumask_copy(&p->cpus_allowed, new_mask);
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