Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched-devel

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched-devel:
  sched: don't allow rt_runtime_us to be zero for groups having rt tasks
  sched: rt-group: fixup schedulability constraints calculation
  sched: fix the wrong time slice value for SCHED_FIFO tasks
  sched: export task_nice
  sched: balance RT task resched only on runqueue
  sched: retain vruntime
This commit is contained in:
Linus Torvalds 2008-03-07 10:08:17 -08:00
commit 1d6789c3bc
4 changed files with 49 additions and 11 deletions

View File

@ -899,6 +899,10 @@ struct sched_class {
int running);
void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
int oldprio, int running);
#ifdef CONFIG_FAIR_GROUP_SCHED
void (*moved_group) (struct task_struct *p);
#endif
};
struct load_weight {

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@ -4422,7 +4422,7 @@ int task_nice(const struct task_struct *p)
{
return TASK_NICE(p);
}
EXPORT_SYMBOL_GPL(task_nice);
EXPORT_SYMBOL(task_nice);
/**
* idle_cpu - is a given cpu idle currently?
@ -5100,7 +5100,7 @@ long sys_sched_rr_get_interval(pid_t pid, struct timespec __user *interval)
time_slice = 0;
if (p->policy == SCHED_RR) {
time_slice = DEF_TIMESLICE;
} else {
} else if (p->policy != SCHED_FIFO) {
struct sched_entity *se = &p->se;
unsigned long flags;
struct rq *rq;
@ -7625,6 +7625,11 @@ void sched_move_task(struct task_struct *tsk)
set_task_rq(tsk, task_cpu(tsk));
#ifdef CONFIG_FAIR_GROUP_SCHED
if (tsk->sched_class->moved_group)
tsk->sched_class->moved_group(tsk);
#endif
if (on_rq) {
if (unlikely(running))
tsk->sched_class->set_curr_task(rq);
@ -7721,9 +7726,7 @@ static unsigned long to_ratio(u64 period, u64 runtime)
if (runtime == RUNTIME_INF)
return 1ULL << 16;
runtime *= (1ULL << 16);
div64_64(runtime, period);
return runtime;
return div64_64(runtime << 16, period);
}
static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
@ -7747,25 +7750,40 @@ static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
return total + to_ratio(period, runtime) < global_ratio;
}
/* Must be called with tasklist_lock held */
static inline int tg_has_rt_tasks(struct task_group *tg)
{
struct task_struct *g, *p;
do_each_thread(g, p) {
if (rt_task(p) && rt_rq_of_se(&p->rt)->tg == tg)
return 1;
} while_each_thread(g, p);
return 0;
}
int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us)
{
u64 rt_runtime, rt_period;
int err = 0;
rt_period = sysctl_sched_rt_period * NSEC_PER_USEC;
rt_period = (u64)sysctl_sched_rt_period * NSEC_PER_USEC;
rt_runtime = (u64)rt_runtime_us * NSEC_PER_USEC;
if (rt_runtime_us == -1)
rt_runtime = rt_period;
rt_runtime = RUNTIME_INF;
mutex_lock(&rt_constraints_mutex);
read_lock(&tasklist_lock);
if (rt_runtime_us == 0 && tg_has_rt_tasks(tg)) {
err = -EBUSY;
goto unlock;
}
if (!__rt_schedulable(tg, rt_period, rt_runtime)) {
err = -EINVAL;
goto unlock;
}
if (rt_runtime_us == -1)
rt_runtime = RUNTIME_INF;
tg->rt_runtime = rt_runtime;
unlock:
read_unlock(&tasklist_lock);
mutex_unlock(&rt_constraints_mutex);
return err;

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@ -1353,6 +1353,16 @@ static void set_curr_task_fair(struct rq *rq)
set_next_entity(cfs_rq_of(se), se);
}
#ifdef CONFIG_FAIR_GROUP_SCHED
static void moved_group_fair(struct task_struct *p)
{
struct cfs_rq *cfs_rq = task_cfs_rq(p);
update_curr(cfs_rq);
place_entity(cfs_rq, &p->se, 1);
}
#endif
/*
* All the scheduling class methods:
*/
@ -1381,6 +1391,10 @@ static const struct sched_class fair_sched_class = {
.prio_changed = prio_changed_fair,
.switched_to = switched_to_fair,
#ifdef CONFIG_FAIR_GROUP_SCHED
.moved_group = moved_group_fair,
#endif
};
#ifdef CONFIG_SCHED_DEBUG

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@ -1107,9 +1107,11 @@ static void prio_changed_rt(struct rq *rq, struct task_struct *p,
pull_rt_task(rq);
/*
* If there's a higher priority task waiting to run
* then reschedule.
* then reschedule. Note, the above pull_rt_task
* can release the rq lock and p could migrate.
* Only reschedule if p is still on the same runqueue.
*/
if (p->prio > rq->rt.highest_prio)
if (p->prio > rq->rt.highest_prio && rq->curr == p)
resched_task(p);
#else
/* For UP simply resched on drop of prio */