sched: add avg-overlap support to RT tasks

We have the notion of tracking process-coupling (a.k.a. buddy-wake) via
the p->se.last_wake / p->se.avg_overlap facilities, but it is only used
for cfs to cfs interactions.  There is no reason why an rt to cfs
interaction cannot share in establishing a relationhip in a similar
manner.

Because PREEMPT_RT runs many kernel threads as FIFO priority, we often
times have heavy interaction between RT threads waking CFS applications.
This patch offers a substantial boost (50-60%+) in perfomance under those
circumstances.

Signed-off-by: Gregory Haskins <ghaskins@novell.com>
Cc: npiggin@suse.de
Cc: rostedt@goodmis.org
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/sched.c b/kernel/sched.c
index d99aeab..bbc40c3 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1693,6 +1693,12 @@ static void set_load_weight(struct task_struct *p)
        p->se.load.inv_weight = prio_to_wmult[p->static_prio - MAX_RT_PRIO];
 }
 
+static void update_avg(u64 *avg, u64 sample)
+{
+       s64 diff = sample - *avg;
+       *avg += diff >> 3;
+}
+
 static void enqueue_task(struct rq *rq, struct task_struct *p, int wakeup)
 {
        sched_info_queued(p);
@@ -1702,6 +1708,12 @@ static void enqueue_task(struct rq *rq, struct task_struct *p, int wakeup)
 
 static void dequeue_task(struct rq *rq, struct task_struct *p, int sleep)
 {
+       if (sleep && p->se.last_wakeup) {
+               update_avg(&p->se.avg_overlap,
+                          p->se.sum_exec_runtime - p->se.last_wakeup);
+               p->se.last_wakeup = 0;
+       }
+
        p->sched_class->dequeue_task(rq, p, sleep);
        p->se.on_rq = 0;
 }
@@ -2313,6 +2325,8 @@ out_running:
                p->sched_class->task_wake_up(rq, p);
 #endif
 out:
+       current->se.last_wakeup = current->se.sum_exec_runtime;
+
        task_rq_unlock(rq, &flags);
 
        return success;

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 2e43d4a..f2aa987 100644 (file)
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -726,21 +726,6 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int wakeup)
                __enqueue_entity(cfs_rq, se);
 }
 
-static void update_avg(u64 *avg, u64 sample)
-{
-       s64 diff = sample - *avg;
-       *avg += diff >> 3;
-}
-
-static void update_avg_stats(struct cfs_rq *cfs_rq, struct sched_entity *se)
-{
-       if (!se->last_wakeup)
-               return;
-
-       update_avg(&se->avg_overlap, se->sum_exec_runtime - se->last_wakeup);
-       se->last_wakeup = 0;
-}
-
 static void
 dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int sleep)
 {
@@ -751,7 +736,6 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int sleep)
 
        update_stats_dequeue(cfs_rq, se);
        if (sleep) {
-               update_avg_stats(cfs_rq, se);
 #ifdef CONFIG_SCHEDSTATS
                if (entity_is_task(se)) {
                        struct task_struct *tsk = task_of(se);
@@ -1196,9 +1180,9 @@ wake_affine(struct rq *rq, struct sched_domain *this_sd, struct rq *this_rq,
         * a reasonable amount of time then attract this newly
         * woken task:
         */
-       if (sync && balanced && curr->sched_class == &fair_sched_class) {
+       if (sync && balanced) {
                if (curr->se.avg_overlap < sysctl_sched_migration_cost &&
-                               p->se.avg_overlap < sysctl_sched_migration_cost)
+                   p->se.avg_overlap < sysctl_sched_migration_cost)
                        return 1;
        }
 
@@ -1359,7 +1343,6 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p)
                return;
        }
 
-       se->last_wakeup = se->sum_exec_runtime;
        if (unlikely(se == pse))
                return;