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Message-Id: <20240308111819.1101550-3-mingo@kernel.org>
Date: Fri, 8 Mar 2024 12:18:08 +0100
From: Ingo Molnar <mingo@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Dietmar Eggemann <dietmar.eggemann@....com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Peter Zijlstra <peterz@...radead.org>,
Shrikanth Hegde <sshegde@...ux.ibm.com>,
Valentin Schneider <vschneid@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>
Subject: [PATCH 02/13] sched/balancing: Rename scheduler_tick() => sched_tick()
- Standardize on prefixing scheduler-internal functions defined
in <linux/sched.h> with sched_*() prefix. scheduler_tick() was
the only function using the scheduler_ prefix. Harmonize it.
- The other reason to rename it is the NOHZ scheduler tick
handling functions are already named sched_tick_*().
Make the 'git grep sched_tick' more meaningful.
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Acked-by: Valentin Schneider <vschneid@...hat.com>
Cc: Dietmar Eggemann <dietmar.eggemann@....com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Shrikanth Hegde <sshegde@...ux.ibm.com>
Cc: Vincent Guittot <vincent.guittot@...aro.org>
---
Documentation/scheduler/sched-domains.rst | 4 ++--
Documentation/translations/zh_CN/scheduler/sched-domains.rst | 4 ++--
include/linux/sched.h | 2 +-
kernel/sched/core.c | 4 ++--
kernel/sched/loadavg.c | 2 +-
kernel/time/timer.c | 2 +-
kernel/workqueue.c | 2 +-
tools/testing/selftests/ftrace/test.d/ftrace/func_set_ftrace_file.tc | 2 +-
8 files changed, 11 insertions(+), 11 deletions(-)
diff --git a/Documentation/scheduler/sched-domains.rst b/Documentation/scheduler/sched-domains.rst
index 6577b068f921..541d6c617971 100644
--- a/Documentation/scheduler/sched-domains.rst
+++ b/Documentation/scheduler/sched-domains.rst
@@ -32,13 +32,13 @@ load of each of its member CPUs, and only when the load of a group becomes
out of balance are tasks moved between groups.
In kernel/sched/core.c, trigger_load_balance() is run periodically on each CPU
-through scheduler_tick(). It raises a softirq after the next regularly scheduled
+through sched_tick(). It raises a softirq after the next regularly scheduled
rebalancing event for the current runqueue has arrived. The actual load
balancing workhorse, sched_balance_softirq()->rebalance_domains(), is then run
in softirq context (SCHED_SOFTIRQ).
The latter function takes two arguments: the runqueue of current CPU and whether
-the CPU was idle at the time the scheduler_tick() happened and iterates over all
+the CPU was idle at the time the sched_tick() happened and iterates over all
sched domains our CPU is on, starting from its base domain and going up the ->parent
chain. While doing that, it checks to see if the current domain has exhausted its
rebalance interval. If so, it runs load_balance() on that domain. It then checks
diff --git a/Documentation/translations/zh_CN/scheduler/sched-domains.rst b/Documentation/translations/zh_CN/scheduler/sched-domains.rst
index fbc326668e37..fa0c0bcc6ba5 100644
--- a/Documentation/translations/zh_CN/scheduler/sched-domains.rst
+++ b/Documentation/translations/zh_CN/scheduler/sched-domains.rst
@@ -34,12 +34,12 @@ CPU共享。任意两个组的CPU掩码的交集不一定为空，如果是这
调度域中的负载均衡发生在调度组中。也就是说，每个组被视为一个实体。组的负载被定义为它
管辖的每个CPU的负载之和。仅当组的负载不均衡后，任务才在组之间发生迁移。
-在kernel/sched/core.c中，trigger_load_balance()在每个CPU上通过scheduler_tick()
+在kernel/sched/core.c中，trigger_load_balance()在每个CPU上通过sched_tick()
周期执行。在当前运行队列下一个定期调度再平衡事件到达后，它引发一个软中断。负载均衡真正
的工作由sched_balance_softirq()->rebalance_domains()完成，在软中断上下文中执行
（SCHED_SOFTIRQ）。
-后一个函数有两个入参：当前CPU的运行队列、它在scheduler_tick()调用时是否空闲。函数会从
+后一个函数有两个入参：当前CPU的运行队列、它在sched_tick()调用时是否空闲。函数会从
当前CPU所在的基调度域开始迭代执行，并沿着parent指针链向上进入更高层级的调度域。在迭代
过程中，函数会检查当前调度域是否已经耗尽了再平衡的时间间隔，如果是，它在该调度域运行
load_balance()。接下来它检查父调度域（如果存在），再后来父调度域的父调度域，以此类推。
diff --git a/include/linux/sched.h b/include/linux/sched.h
index ffe8f618ab86..739e32ead24b 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -301,7 +301,7 @@ enum {
TASK_COMM_LEN = 16,
};
-extern void scheduler_tick(void);
+extern void sched_tick(void);
#define MAX_SCHEDULE_TIMEOUT LONG_MAX
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index a76c7095f736..3affa9a6b249 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5651,7 +5651,7 @@ static inline u64 cpu_resched_latency(struct rq *rq) { return 0; }
* This function gets called by the timer code, with HZ frequency.
* We call it with interrupts disabled.
*/
-void scheduler_tick(void)
+void sched_tick(void)
{
int cpu = smp_processor_id();
struct rq *rq = cpu_rq(cpu);
@@ -6574,7 +6574,7 @@ pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
* paths. For example, see arch/x86/entry_64.S.
*
* To drive preemption between tasks, the scheduler sets the flag in timer
- * interrupt handler scheduler_tick().
+ * interrupt handler sched_tick().
*
* 3. Wakeups don't really cause entry into schedule(). They add a
* task to the run-queue and that's it.
diff --git a/kernel/sched/loadavg.c b/kernel/sched/loadavg.c
index 52c8f8226b0d..ca9da66cc894 100644
--- a/kernel/sched/loadavg.c
+++ b/kernel/sched/loadavg.c
@@ -379,7 +379,7 @@ void calc_global_load(void)
}
/*
- * Called from scheduler_tick() to periodically update this CPU's
+ * Called from sched_tick() to periodically update this CPU's
* active count.
*/
void calc_global_load_tick(struct rq *this_rq)
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 352b161113cd..ec003ad18b2d 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -2089,7 +2089,7 @@ void update_process_times(int user_tick)
if (in_irq())
irq_work_tick();
#endif
- scheduler_tick();
+ sched_tick();
if (IS_ENABLED(CONFIG_POSIX_TIMERS))
run_posix_cpu_timers();
}
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 7b482a26d741..8aa3a0829dd4 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1324,7 +1324,7 @@ void wq_worker_sleeping(struct task_struct *task)
* wq_worker_tick - a scheduler tick occurred while a kworker is running
* @task: task currently running
*
- * Called from scheduler_tick(). We're in the IRQ context and the current
+ * Called from sched_tick(). We're in the IRQ context and the current
* worker's fields which follow the 'K' locking rule can be accessed safely.
*/
void wq_worker_tick(struct task_struct *task)
diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func_set_ftrace_file.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func_set_ftrace_file.tc
index 25432b8cd5bd..073a748b9380 100644
--- a/tools/testing/selftests/ftrace/test.d/ftrace/func_set_ftrace_file.tc
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/func_set_ftrace_file.tc
@@ -19,7 +19,7 @@ fail() { # mesg
FILTER=set_ftrace_filter
FUNC1="schedule"
-FUNC2="scheduler_tick"
+FUNC2="sched_tick"
ALL_FUNCS="#### all functions enabled ####"
--
2.40.1
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