This patch adds pushing of overloaded RT tasks from a runqueue that is having tasks (most likely RT tasks) added to the run queue. TODO: We don't cover the case of waking of new RT tasks (yet). Signed-off-by: Steven Rostedt --- kernel/sched.c | 3 +++ kernel/sched_rt.c | 10 ++++++++++ 2 files changed, 13 insertions(+) Index: linux-compile.git/kernel/sched_rt.c =================================================================== --- linux-compile.git.orig/kernel/sched_rt.c 2007-11-16 22:12:13.000000000 -0500 +++ linux-compile.git/kernel/sched_rt.c 2007-11-16 22:12:17.000000000 -0500 @@ -562,6 +562,15 @@ static void schedule_tail_balance_rt(str } } + +static void wakeup_balance_rt(struct rq *rq, struct task_struct *p) +{ + if (unlikely(rt_task(p)) && + !task_running(rq, p) && + (p->prio >= rq->curr->prio)) + push_rt_tasks(rq); +} + /* * Load-balancing iterator. Note: while the runqueue stays locked * during the whole iteration, the current task might be @@ -669,6 +678,7 @@ move_one_task_rt(struct rq *this_rq, int #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) Index: linux-compile.git/kernel/sched.c =================================================================== --- linux-compile.git.orig/kernel/sched.c 2007-11-16 22:12:13.000000000 -0500 +++ linux-compile.git/kernel/sched.c 2007-11-16 22:12:17.000000000 -0500 @@ -22,6 +22,8 @@ * by Peter Williams * 2007-05-06 Interactivity improvements to CFS by Mike Galbraith * 2007-07-01 Group scheduling enhancements by Srivatsa Vaddagiri + * 2007-10-22 RT overload balancing by Steven Rostedt + * (with thanks to Gregory Haskins) */ #include @@ -1635,6 +1637,7 @@ out_activate: out_running: p->state = TASK_RUNNING; + wakeup_balance_rt(rq, p); out: task_rq_unlock(rq, &flags); -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/