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authorSteven Rostedt <srostedt@redhat.com>2008-01-25 21:08:04 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-25 21:08:04 +0100
commit764a9d6fe4b52995c8aba277e3634385699354f4 (patch)
tree497587d29fc867cfe8fc1aab68dd4ed7aba72bdd /kernel/sched.c
parent63489e45e265f64c368882be1f01c42dec5d984c (diff)
downloadop-kernel-dev-764a9d6fe4b52995c8aba277e3634385699354f4.zip
op-kernel-dev-764a9d6fe4b52995c8aba277e3634385699354f4.tar.gz
sched: track highest prio task queued
This patch adds accounting to each runqueue to keep track of the highest prio task queued on the run queue. We only care about RT tasks, so if the run queue does not contain any active RT tasks its priority will be considered MAX_RT_PRIO. This information will be used for later patches. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 9dd8d12..6185fa0 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -343,6 +343,8 @@ struct rt_rq {
int rt_load_balance_idx;
struct list_head *rt_load_balance_head, *rt_load_balance_curr;
unsigned long rt_nr_running;
+ /* highest queued rt task prio */
+ int highest_prio;
};
/*
@@ -6864,6 +6866,7 @@ void __init sched_init(void)
rq->cpu = i;
rq->migration_thread = NULL;
INIT_LIST_HEAD(&rq->migration_queue);
+ rq->rt.highest_prio = MAX_RT_PRIO;
#endif
atomic_set(&rq->nr_iowait, 0);
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