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author | Steven Rostedt <rostedt@goodmis.org> | 2008-01-25 20:08:22 (GMT) |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-01-25 20:08:22 (GMT) |
commit | cb46984504048db946cd551c261df4e70d59a8ea (patch) | |
tree | e07343cc5967f74370c6b0290b67a225d868a99d /kernel/sched_fair.c | |
parent | 9a897c5a6701bcb6f099f7ca20194999102729fd (diff) | |
download | linux-cb46984504048db946cd551c261df4e70d59a8ea.tar.xz |
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_fair.c')
-rw-r--r-- | kernel/sched_fair.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index 10aa6e1..dfa18d5 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -1280,6 +1280,42 @@ static void task_new_fair(struct rq *rq, struct task_struct *p) resched_task(rq->curr); } +/* + * Priority of the task has changed. Check to see if we preempt + * the current task. + */ +static void prio_changed_fair(struct rq *rq, struct task_struct *p, + int oldprio, int running) +{ + /* + * 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); +} + +/* + * We switched to the sched_fair class. + */ +static void switched_to_fair(struct rq *rq, struct task_struct *p, + int running) +{ + /* + * We were most likely switched from sched_rt, so + * kick off the schedule if running, otherwise just see + * if we can still preempt the current task. + */ + if (running) + resched_task(rq->curr); + else + check_preempt_curr(rq, p); +} + /* Account for a task changing its policy or group. * * This routine is mostly called to set cfs_rq->curr field when a task @@ -1318,6 +1354,9 @@ static const struct sched_class fair_sched_class = { .set_curr_task = set_curr_task_fair, .task_tick = task_tick_fair, .task_new = task_new_fair, + + .prio_changed = prio_changed_fair, + .switched_to = switched_to_fair, }; #ifdef CONFIG_SCHED_DEBUG |