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| author | Steven Rostedt <rostedt@goodmis.org> | 2008-01-25 21:08:22 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-25 21:08:22 +0100 |
| commit | cb46984504048db946cd551c261df4e70d59a8ea (patch) | |
| tree | e07343cc5967f74370c6b0290b67a225d868a99d /kernel/sched_idletask.c | |
| parent | 9a897c5a6701bcb6f099f7ca20194999102729fd (diff) | |
| download | linux-cb46984504048db946cd551c261df4e70d59a8ea.tar.gz linux-cb46984504048db946cd551c261df4e70d59a8ea.tar.bz2 linux-cb46984504048db946cd551c261df4e70d59a8ea.zip | |
sched: RT-balance, add new methods to sched_class
Dmitry Adamushko found that the current implementation of the RT
balancing code left out changes to the sched_setscheduler and
rt_mutex_setprio.
This patch addresses this issue by adding methods to the schedule classes
to handle being switched out of (switched_from) and being switched into
(switched_to) a sched_class. Also a method for changing of priorities
is also added (prio_changed).
This patch also removes some duplicate logic between rt_mutex_setprio and
sched_setscheduler.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_idletask.c')
| -rw-r--r-- | kernel/sched_idletask.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/kernel/sched_idletask.c b/kernel/sched_idletask.c index ca5374860aef..ef7a2661fa10 100644 --- a/kernel/sched_idletask.c +++ b/kernel/sched_idletask.c @@ -69,6 +69,33 @@ static void set_curr_task_idle(struct rq *rq) { } +static void switched_to_idle(struct rq *rq, struct task_struct *p, + int running) +{ + /* Can this actually happen?? */ + if (running) + resched_task(rq->curr); + else + check_preempt_curr(rq, p); +} + +static void prio_changed_idle(struct rq *rq, struct task_struct *p, + int oldprio, int running) +{ + /* This can happen for hot plug CPUS */ + + /* + * Reschedule if we are currently running on this runqueue and + * our priority decreased, or if we are not currently running on + * this runqueue and our priority is higher than the current's + */ + if (running) { + if (p->prio > oldprio) + resched_task(rq->curr); + } else + check_preempt_curr(rq, p); +} + /* * Simple, special scheduling class for the per-CPU idle tasks: */ @@ -94,5 +121,9 @@ const struct sched_class idle_sched_class = { .set_curr_task = set_curr_task_idle, .task_tick = task_tick_idle, + + .prio_changed = prio_changed_idle, + .switched_to = switched_to_idle, + /* no .task_new for idle tasks */ }; |