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authorAvi Kivity <avi@qumranet.com>2007-07-26 13:40:43 +0200
committerIngo Molnar <mingo@elte.hu>2007-07-26 13:40:43 +0200
commite107be36efb2a233833e8c9899039a370e4b2318 (patch)
tree655955aa81aefeff441c412adaafe9b51a00ff56 /kernel
parentb47e8608a08766ef8121cd747d3aaf6c3dc22649 (diff)
downloadlinaro-lsk-e107be36efb2a233833e8c9899039a370e4b2318.tar.gz
[PATCH] sched: arch preempt notifier mechanism
This adds a general mechanism whereby a task can request the scheduler to notify it whenever it is preempted or scheduled back in. This allows the task to swap any special-purpose registers like the fpu or Intel's VT registers. Signed-off-by: Avi Kivity <avi@qumranet.com> [ mingo@elte.hu: fixes, cleanups ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/Kconfig.preempt3
-rw-r--r--kernel/sched.c73
2 files changed, 74 insertions, 2 deletions
diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
index c64ce9c1420..6b066632e40 100644
--- a/kernel/Kconfig.preempt
+++ b/kernel/Kconfig.preempt
@@ -63,3 +63,6 @@ config PREEMPT_BKL
Say Y here if you are building a kernel for a desktop system.
Say N if you are unsure.
+config PREEMPT_NOTIFIERS
+ bool
+
diff --git a/kernel/sched.c b/kernel/sched.c
index 93cf241cfbe..e901aa59f20 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1592,6 +1592,10 @@ static void __sched_fork(struct task_struct *p)
INIT_LIST_HEAD(&p->run_list);
p->se.on_rq = 0;
+#ifdef CONFIG_PREEMPT_NOTIFIERS
+ INIT_HLIST_HEAD(&p->preempt_notifiers);
+#endif
+
/*
* We mark the process as running here, but have not actually
* inserted it onto the runqueue yet. This guarantees that
@@ -1673,6 +1677,63 @@ void fastcall wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
task_rq_unlock(rq, &flags);
}
+#ifdef CONFIG_PREEMPT_NOTIFIERS
+
+/**
+ * preempt_notifier_register - tell me when current is being being preempted
+ * and rescheduled
+ */
+void preempt_notifier_register(struct preempt_notifier *notifier)
+{
+ hlist_add_head(&notifier->link, &current->preempt_notifiers);
+}
+EXPORT_SYMBOL_GPL(preempt_notifier_register);
+
+/**
+ * preempt_notifier_unregister - no longer interested in preemption notifications
+ *
+ * This is safe to call from within a preemption notifier.
+ */
+void preempt_notifier_unregister(struct preempt_notifier *notifier)
+{
+ hlist_del(&notifier->link);
+}
+EXPORT_SYMBOL_GPL(preempt_notifier_unregister);
+
+static void fire_sched_in_preempt_notifiers(struct task_struct *curr)
+{
+ struct preempt_notifier *notifier;
+ struct hlist_node *node;
+
+ hlist_for_each_entry(notifier, node, &curr->preempt_notifiers, link)
+ notifier->ops->sched_in(notifier, raw_smp_processor_id());
+}
+
+static void
+fire_sched_out_preempt_notifiers(struct task_struct *curr,
+ struct task_struct *next)
+{
+ struct preempt_notifier *notifier;
+ struct hlist_node *node;
+
+ hlist_for_each_entry(notifier, node, &curr->preempt_notifiers, link)
+ notifier->ops->sched_out(notifier, next);
+}
+
+#else
+
+static void fire_sched_in_preempt_notifiers(struct task_struct *curr)
+{
+}
+
+static void
+fire_sched_out_preempt_notifiers(struct task_struct *curr,
+ struct task_struct *next)
+{
+}
+
+#endif
+
/**
* prepare_task_switch - prepare to switch tasks
* @rq: the runqueue preparing to switch
@@ -1685,8 +1746,11 @@ void fastcall wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
* prepare_task_switch sets up locking and calls architecture specific
* hooks.
*/
-static inline void prepare_task_switch(struct rq *rq, struct task_struct *next)
+static inline void
+prepare_task_switch(struct rq *rq, struct task_struct *prev,
+ struct task_struct *next)
{
+ fire_sched_out_preempt_notifiers(prev, next);
prepare_lock_switch(rq, next);
prepare_arch_switch(next);
}
@@ -1728,6 +1792,7 @@ static inline void finish_task_switch(struct rq *rq, struct task_struct *prev)
prev_state = prev->state;
finish_arch_switch(prev);
finish_lock_switch(rq, prev);
+ fire_sched_in_preempt_notifiers(current);
if (mm)
mmdrop(mm);
if (unlikely(prev_state == TASK_DEAD)) {
@@ -1768,7 +1833,7 @@ context_switch(struct rq *rq, struct task_struct *prev,
{
struct mm_struct *mm, *oldmm;
- prepare_task_switch(rq, next);
+ prepare_task_switch(rq, prev, next);
mm = next->mm;
oldmm = prev->active_mm;
/*
@@ -6335,6 +6400,10 @@ void __init sched_init(void)
set_load_weight(&init_task);
+#ifdef CONFIG_PREEMPT_NOTIFIERS
+ INIT_HLIST_HEAD(&init_task.preempt_notifiers);
+#endif
+
#ifdef CONFIG_SMP
nr_cpu_ids = highest_cpu + 1;
open_softirq(SCHED_SOFTIRQ, run_rebalance_domains, NULL);