[PATCH RFCv2 8/9] kernel/sched: Add cpu_rq_is_locked()
From: Gavin Shan <hidden>
Date: 2020-05-08 03:31:20
Also in:
kvmarm, lkml
Subsystem:
scheduler, the rest · Maintainers:
Ingo Molnar, Peter Zijlstra, Juri Lelli, Vincent Guittot, Linus Torvalds
This adds API cpu_rq_is_locked() to check if the CPU's runqueue has been locked or not. It's used in the subsequent patch to determine the task wakeup should be executed immediately or delayed. Signed-off-by: Gavin Shan <redacted> --- include/linux/sched.h | 1 + kernel/sched/core.c | 8 ++++++++ 2 files changed, 9 insertions(+)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 4418f5cb8324..e68882443da7 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h@@ -1691,6 +1691,7 @@ extern struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *n */ extern struct task_struct *find_get_task_by_vpid(pid_t nr); +extern bool cpu_rq_is_locked(int cpu); extern int wake_up_state(struct task_struct *tsk, unsigned int state); extern int wake_up_process(struct task_struct *tsk); extern void wake_up_new_task(struct task_struct *tsk);
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 9a2fbf98fd6f..30f4a8845495 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c@@ -73,6 +73,14 @@ __read_mostly int scheduler_running; */ int sysctl_sched_rt_runtime = 950000; +bool cpu_rq_is_locked(int cpu) +{ + struct rq *rq = cpu_rq(cpu); + + return raw_spin_is_locked(&rq->lock) ? true : false; +} +EXPORT_SYMBOL_GPL(cpu_rq_is_locked); + /* * __task_rq_lock - lock the rq @p resides on. */
--
2.23.0
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