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| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-12-19 16:44:52 -0500 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-06-25 13:45:43 +0200 |
| commit | 590d69796346353878b275c5512c664e3f875f24 (patch) | |
| tree | 3f067ae43ac90ed33744b69de6ecd8aa8b6ebd9d /kernel/sched/rt.c | |
| parent | 87e867b4269f29dac8190bca13912d08163a277f (diff) | |
| download | linux-590d69796346353878b275c5512c664e3f875f24.tar.bz2 | |
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/rt.c')
| -rw-r--r-- | kernel/sched/rt.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index f395ddb75f38..6543d4430331 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -2429,7 +2429,8 @@ static unsigned int get_rr_interval_rt(struct rq *rq, struct task_struct *task) return 0; } -const struct sched_class rt_sched_class = { +const struct sched_class rt_sched_class + __attribute__((section("__rt_sched_class"))) = { .next = &fair_sched_class, .enqueue_task = enqueue_task_rt, .dequeue_task = dequeue_task_rt, |