[PATCH 1/2] sched/deadline: Add cpudl_maximum_dl()

From: Byungchul Park
Date: Fri Jun 02 2017 - 03:31:48 EST


Current code uses cpudl_maximum() to get the root node's cpu, while it
directly accesses the root node using 'cp->elements[0].dl' to get the
root node's dl. It would be better and more readible if a function to
get the dl is added. So add it.

Signed-off-by: Byungchul Park <byungchul.park@xxxxxxx>
---
kernel/sched/cpudeadline.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/cpudeadline.c b/kernel/sched/cpudeadline.c
index fba235c..d4a6963 100644
--- a/kernel/sched/cpudeadline.c
+++ b/kernel/sched/cpudeadline.c
@@ -108,11 +108,16 @@ static void cpudl_heapify(struct cpudl *cp, int idx)
cpudl_heapify_down(cp, idx);
}

-static inline int cpudl_maximum(struct cpudl *cp)
+static inline int cpudl_maximum_cpu(struct cpudl *cp)
{
return cp->elements[0].cpu;
}

+static inline u64 cpudl_maximum_dl(struct cpudl *cp)
+{
+ return cp->elements[0].dl;
+}
+
/*
* cpudl_find - find the best (later-dl) CPU in the system
* @cp: the cpudl max-heap context
@@ -131,9 +136,9 @@ int cpudl_find(struct cpudl *cp, struct task_struct *p,
cpumask_and(later_mask, cp->free_cpus, &p->cpus_allowed)) {
best_cpu = cpumask_any(later_mask);
goto out;
- } else if (cpumask_test_cpu(cpudl_maximum(cp), &p->cpus_allowed) &&
- dl_time_before(dl_se->deadline, cp->elements[0].dl)) {
- best_cpu = cpudl_maximum(cp);
+ } else if (cpumask_test_cpu(cpudl_maximum_cpu(cp), &p->cpus_allowed) &&
+ dl_time_before(dl_se->deadline, cpudl_maximum_dl(cp))) {
+ best_cpu = cpudl_maximum_cpu(cp);
if (later_mask)
cpumask_set_cpu(best_cpu, later_mask);
}
--
1.9.1