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authorSteven Rostedt <rostedt@goodmis.org>2008-01-25 21:08:22 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-25 21:08:22 +0100
commit9a897c5a6701bcb6f099f7ca20194999102729fd (patch)
tree9c5415d5e2dd115660200cbd246fe1343cd5cd5c /kernel
parentsched: remove do_div() from __sched_slice() (diff)
downloadlinux-dev-9a897c5a6701bcb6f099f7ca20194999102729fd.tar.xz
linux-dev-9a897c5a6701bcb6f099f7ca20194999102729fd.zip
sched: RT-balance, replace hooks with pre/post schedule and wakeup methods
To make the main sched.c code more agnostic to the schedule classes. Instead of having specific hooks in the schedule code for the RT class balancing. They are replaced with a pre_schedule, post_schedule and task_wake_up methods. These methods may be used by any of the classes but currently, only the sched_rt class implements them. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched.c20
-rw-r--r--kernel/sched_rt.c17
2 files changed, 23 insertions, 14 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 9d6fb731559b..2368a0d882e3 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1625,7 +1625,10 @@ out_activate:
out_running:
p->state = TASK_RUNNING;
- wakeup_balance_rt(rq, p);
+#ifdef CONFIG_SMP
+ if (p->sched_class->task_wake_up)
+ p->sched_class->task_wake_up(rq, p);
+#endif
out:
task_rq_unlock(rq, &flags);
@@ -1748,7 +1751,10 @@ void fastcall wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
inc_nr_running(p, rq);
}
check_preempt_curr(rq, p);
- wakeup_balance_rt(rq, p);
+#ifdef CONFIG_SMP
+ if (p->sched_class->task_wake_up)
+ p->sched_class->task_wake_up(rq, p);
+#endif
task_rq_unlock(rq, &flags);
}
@@ -1869,7 +1875,10 @@ static void finish_task_switch(struct rq *rq, struct task_struct *prev)
prev_state = prev->state;
finish_arch_switch(prev);
finish_lock_switch(rq, prev);
- schedule_tail_balance_rt(rq);
+#ifdef CONFIG_SMP
+ if (current->sched_class->post_schedule)
+ current->sched_class->post_schedule(rq);
+#endif
fire_sched_in_preempt_notifiers(current);
if (mm)
@@ -3638,7 +3647,10 @@ need_resched_nonpreemptible:
switch_count = &prev->nvcsw;
}
- schedule_balance_rt(rq, prev);
+#ifdef CONFIG_SMP
+ if (prev->sched_class->pre_schedule)
+ prev->sched_class->pre_schedule(rq, prev);
+#endif
if (unlikely(!rq->nr_running))
idle_balance(cpu, rq);
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 3ea0cae513d2..a5a45104603a 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -689,14 +689,14 @@ static int pull_rt_task(struct rq *this_rq)
return ret;
}
-static void schedule_balance_rt(struct rq *rq, struct task_struct *prev)
+static void pre_schedule_rt(struct rq *rq, struct task_struct *prev)
{
/* Try to pull RT tasks here if we lower this rq's prio */
if (unlikely(rt_task(prev)) && rq->rt.highest_prio > prev->prio)
pull_rt_task(rq);
}
-static void schedule_tail_balance_rt(struct rq *rq)
+static void post_schedule_rt(struct rq *rq)
{
/*
* If we have more than one rt_task queued, then
@@ -713,10 +713,9 @@ static void schedule_tail_balance_rt(struct rq *rq)
}
-static void wakeup_balance_rt(struct rq *rq, struct task_struct *p)
+static void task_wake_up_rt(struct rq *rq, struct task_struct *p)
{
- if (unlikely(rt_task(p)) &&
- !task_running(rq, p) &&
+ if (!task_running(rq, p) &&
(p->prio >= rq->rt.highest_prio) &&
rq->rt.overloaded)
push_rt_tasks(rq);
@@ -780,11 +779,6 @@ static void leave_domain_rt(struct rq *rq)
if (rq->rt.overloaded)
rt_clear_overload(rq);
}
-
-#else /* CONFIG_SMP */
-# define schedule_tail_balance_rt(rq) do { } while (0)
-# define schedule_balance_rt(rq, prev) do { } while (0)
-# define wakeup_balance_rt(rq, p) do { } while (0)
#endif /* CONFIG_SMP */
static void task_tick_rt(struct rq *rq, struct task_struct *p)
@@ -840,6 +834,9 @@ const struct sched_class rt_sched_class = {
.set_cpus_allowed = set_cpus_allowed_rt,
.join_domain = join_domain_rt,
.leave_domain = leave_domain_rt,
+ .pre_schedule = pre_schedule_rt,
+ .post_schedule = post_schedule_rt,
+ .task_wake_up = task_wake_up_rt,
#endif
.set_curr_task = set_curr_task_rt,