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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 | |
| parent | 87e867b4269f29dac8190bca13912d08163a277f (diff) | |
| download | lwn-590d69796346353878b275c5512c664e3f875f24.tar.gz lwn-590d69796346353878b275c5512c664e3f875f24.zip | |
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')
| -rw-r--r-- | kernel/sched/deadline.c | 3 | ||||
| -rw-r--r-- | kernel/sched/fair.c | 3 | ||||
| -rw-r--r-- | kernel/sched/idle.c | 3 | ||||
| -rw-r--r-- | kernel/sched/rt.c | 3 | ||||
| -rw-r--r-- | kernel/sched/stop_task.c | 3 |
5 files changed, 10 insertions, 5 deletions
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index d4708e29008f..d9e79462993b 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -2479,7 +2479,8 @@ static void prio_changed_dl(struct rq *rq, struct task_struct *p, } } -const struct sched_class dl_sched_class = { +const struct sched_class dl_sched_class + __attribute__((section("__dl_sched_class"))) = { .next = &rt_sched_class, .enqueue_task = enqueue_task_dl, .dequeue_task = dequeue_task_dl, diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 0424a0af5f87..3365f6b07c36 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -11122,7 +11122,8 @@ static unsigned int get_rr_interval_fair(struct rq *rq, struct task_struct *task /* * All the scheduling class methods: */ -const struct sched_class fair_sched_class = { +const struct sched_class fair_sched_class + __attribute__((section("__fair_sched_class"))) = { .next = &idle_sched_class, .enqueue_task = enqueue_task_fair, .dequeue_task = dequeue_task_fair, 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 */ 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, diff --git a/kernel/sched/stop_task.c b/kernel/sched/stop_task.c index 3e50a6a8f1e5..f4bbd54caae0 100644 --- a/kernel/sched/stop_task.c +++ b/kernel/sched/stop_task.c @@ -109,7 +109,8 @@ static void update_curr_stop(struct rq *rq) /* * Simple, special scheduling class for the per-CPU stop tasks: */ -const struct sched_class stop_sched_class = { +const struct sched_class stop_sched_class + __attribute__((section("__stop_sched_class"))) = { .next = &dl_sched_class, .enqueue_task = enqueue_task_stop, |