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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2019-12-19 16:44:52 -0500
committerPeter Zijlstra <peterz@infradead.org>2020-06-25 13:45:43 +0200
commit590d69796346353878b275c5512c664e3f875f24 (patch)
tree3f067ae43ac90ed33744b69de6ecd8aa8b6ebd9d /kernel/sched/idle.c
parent87e867b4269f29dac8190bca13912d08163a277f (diff)
sched: Force the address order of each sched class descriptor
In order to make a micro optimization in pick_next_task(), the order of the sched class descriptor address must be in the same order as their priority to each other. That is: &idle_sched_class < &fair_sched_class < &rt_sched_class < &dl_sched_class < &stop_sched_class In order to guarantee this order of the sched class descriptors, add each one into their own data section and force the order in the linker script. Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/157675913272.349305.8936736338884044103.stgit@localhost.localdomain
Diffstat (limited to 'kernel/sched/idle.c')
-rw-r--r--kernel/sched/idle.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 8d75ca201484..f5806295356b 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -453,7 +453,8 @@ static void update_curr_idle(struct rq *rq)
/*
* Simple, special scheduling class for the per-CPU idle tasks:
*/
-const struct sched_class idle_sched_class = {
+const struct sched_class idle_sched_class
+ __attribute__((section("__idle_sched_class"))) = {
/* .next is NULL */
/* no enqueue/yield_task for idle tasks */