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Groups > linux.kernel > #1576858

[PATCH 28/53] sched/headers: Move the NOHZ APIs from <linux/sched.h> to <linux/sched/nohz.h>

From Ingo Molnar <mingo@kernel.org>
Newsgroups linux.kernel
Subject [PATCH 28/53] sched/headers: Move the NOHZ APIs from <linux/sched.h> to <linux/sched/nohz.h>
Date 2017-02-08 19:50 +0100
Message-ID <t8Ftz-3Sf-93@gated-at.bofh.it> (permalink)
References <t8Ftw-3Sf-7@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

There's a number of NOHZ/dyntics related functionality in <linux/sched.h>,
but only a handful of timer files are making use of them.

Move them into their own header. This better documents these APIs
and unclutters <linux/sched.h>.

Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 include/linux/sched.h      | 35 -----------------------------------
 include/linux/sched/nohz.h | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+), 35 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index b4f0d9888d8c..c83424b1e1ac 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -46,14 +46,6 @@ struct nameidata;
 struct signal_struct;
 struct sighand_struct;
 
-#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
-extern void cpu_load_update_nohz_start(void);
-extern void cpu_load_update_nohz_stop(void);
-#else
-static inline void cpu_load_update_nohz_start(void) { }
-static inline void cpu_load_update_nohz_stop(void) { }
-#endif
-
 extern void dump_cpu_task(int cpu);
 
 struct seq_file;
@@ -204,15 +196,6 @@ extern cpumask_var_t cpu_isolated_map;
 
 extern int runqueue_is_locked(int cpu);
 
-#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
-extern void nohz_balance_enter_idle(int cpu);
-extern void set_cpu_sd_state_idle(void);
-extern int get_nohz_timer_target(void);
-#else
-static inline void nohz_balance_enter_idle(int cpu) { }
-static inline void set_cpu_sd_state_idle(void) { }
-#endif
-
 /*
  * Only dump TASK_* tasks. (0 for all tasks)
  */
@@ -1531,14 +1514,6 @@ static inline int set_cpus_allowed_ptr(struct task_struct *p,
 }
 #endif
 
-#ifdef CONFIG_NO_HZ_COMMON
-void calc_load_enter_idle(void);
-void calc_load_exit_idle(void);
-#else
-static inline void calc_load_enter_idle(void) { }
-static inline void calc_load_exit_idle(void) { }
-#endif /* CONFIG_NO_HZ_COMMON */
-
 #ifndef cpu_relax_yield
 #define cpu_relax_yield() cpu_relax()
 #endif
@@ -1559,16 +1534,6 @@ extern void idle_task_exit(void);
 static inline void idle_task_exit(void) {}
 #endif
 
-#if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP)
-extern void wake_up_nohz_cpu(int cpu);
-#else
-static inline void wake_up_nohz_cpu(int cpu) { }
-#endif
-
-#ifdef CONFIG_NO_HZ_FULL
-extern u64 scheduler_tick_max_deferment(void);
-#endif
-
 extern int yield_to(struct task_struct *p, bool preempt);
 extern void set_user_nice(struct task_struct *p, long nice);
 extern int task_prio(const struct task_struct *p);
diff --git a/include/linux/sched/nohz.h b/include/linux/sched/nohz.h
index fe6caf0dab10..9471f0736a3a 100644
--- a/include/linux/sched/nohz.h
+++ b/include/linux/sched/nohz.h
@@ -3,4 +3,43 @@
 
 #include <linux/sched.h>
 
+/*
+ * This is the interface between the scheduler and nohz/dyntics:
+ */
+
+#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
+extern void cpu_load_update_nohz_start(void);
+extern void cpu_load_update_nohz_stop(void);
+#else
+static inline void cpu_load_update_nohz_start(void) { }
+static inline void cpu_load_update_nohz_stop(void) { }
+#endif
+
+#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
+extern void nohz_balance_enter_idle(int cpu);
+extern void set_cpu_sd_state_idle(void);
+extern int get_nohz_timer_target(void);
+#else
+static inline void nohz_balance_enter_idle(int cpu) { }
+static inline void set_cpu_sd_state_idle(void) { }
+#endif
+
+#ifdef CONFIG_NO_HZ_COMMON
+void calc_load_enter_idle(void);
+void calc_load_exit_idle(void);
+#else
+static inline void calc_load_enter_idle(void) { }
+static inline void calc_load_exit_idle(void) { }
+#endif /* CONFIG_NO_HZ_COMMON */
+
+#if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP)
+extern void wake_up_nohz_cpu(int cpu);
+#else
+static inline void wake_up_nohz_cpu(int cpu) { }
+#endif
+
+#ifdef CONFIG_NO_HZ_FULL
+extern u64 scheduler_tick_max_deferment(void);
+#endif
+
 #endif /* _LINUX_SCHED_NOHZ_H */
-- 
2.7.4

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[PATCH 00/53] sched.h modernization -v2, phase #3: "Move definitions between headers" Ingo Molnar <mingo@kernel.org> - 2017-02-08 19:50 +0100
  [PATCH 04/53] sched/headers: Move idle polling methods to <linux/sched/idle.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 19:50 +0100
  [PATCH 16/53] sched/headers: Move 'struct pacct_struct' and 'struct cpu_itimer' form <linux/sched.h> to <linux/sched/signal.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 19:50 +0100
  [PATCH 05/53] sched/headers: Move the wake-queue types and interfaces from sched.h into <linux/sched/wake_q.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 19:50 +0100
  [PATCH 26/53] sched/headers: Move the memalloc_noio_*() APIs to <linux/sched/mm.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 19:50 +0100
  [PATCH 28/53] sched/headers: Move the NOHZ APIs from <linux/sched.h> to <linux/sched/nohz.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 19:50 +0100
  [PATCH 34/53] sched/headers, RCU: Move rcu_copy_process() from <linux/sched/task.h> to kernel/fork.c Ingo Molnar <mingo@kernel.org> - 2017-02-08 19:50 +0100
  [PATCH 30/53] sched/headers, time/timekeeping: Move the xtime_update() prototype from <linux/sched.h> to <linux/time.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 19:50 +0100
  [PATCH 17/53] sched/headers: Move the cpufreq interfaces to <linux/sched/cpufreq.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 11/53] sched/headers: Move task->mm handling methods to <linux/sched/mm.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 48/53] sched/headers: Move exit_files() and exit_itimers() from <linux/sched.h> to <linux/sched/task.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 08/53] sched/headers: Move various ABI definitions to <uapi/linux/sched/types.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 19/53] sched/headers: Move the 'init_mm' declaration from <linux/sched.h> to <linux/mm_types.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 25/53] sched/headers: Move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 02/53] sched/headers: Move the 'cpu_idle_type' enum from <linux/sched.h> to <linux/sched/idle.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 50/53] sched/headers, timekeeping: Move the timer tick function prototypes to <linux/timekeeping.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 21/53] sched/headers: Move the NUMA balancing interfaces from <linux/sched.h> to <linux/sched/numa_balancing.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 31/53] sched/headers: Move <asm/current.h> include from the middle of <linux/sched.h> to the header portion Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 15/53] sched/headers: Move softlockup detector watchdog methods to <linux/nmi.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 29/53] sched/headers: Move debugging functions from <linux/sched.h> to <linux/sched/debug.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 27/53] sched/headers: Move task statistics APIs from <linux/sched.h> to <linux/sched/stat.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 23/53] sched/headers: Remove various unrelated headers from <linux/sched.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 13/53] sched/headers: Move task_struct::signal and task_struct::sighand types and accessors into <linux/sched/signal.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 18/53] sched/headers: Move more mm_struct related functionality from <linux/sched.h> to <linux/sched/mm.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 01/53] sched/headers: Move scheduler topology interfaces to <linux/sched/topology.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 42/53] sched/headers: Move 'init_task' and 'init_thread_union' from <linux/sched.h> to <linux/sched/task.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:20 +0100
  [PATCH 49/53] sched/headers: Move _init() prototypes from <linux/sched.h> to <linux/sched/init.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:20 +0100
  [PATCH 41/53] sched/headers: Remove the <linux/mm_types.h> dependency from <linux/sched.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:20 +0100
  [PATCH 44/53] sched/headers: Move cputime functionality from <linux/sched.h> and <linux/cputime.h> into <linux/sched/cputime.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:20 +0100
  [PATCH 40/53] mm/headers, sched/headers: Move task related MM types from <linux/mm_types.> to <linux/mm_types_task.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:20 +0100
  [PATCH 43/53] sched/headers: Move the task_lock()/unlock() APIs to <linux/sched/task.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:20 +0100
  [PATCH 46/53] sched/headers, vfs/execve: Move the do_execve*() prototypes from <linux/sched.h> to <linux/binfmts.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:50 +0100
  [PATCH 53/53] sched/headers: Move the sched_exec() prototype to <linux/sched/task.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:50 +0100
  [PATCH 45/53] sched/headers: Move sched_info_on() and force_schedstat_enabled() from <linux/sched.h> to <linux/sched/stat.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 21:40 +0100
  [PATCH 51/53] sched/headers, mm: Move 'struct tlbflush_unmap_batch' from <linux/sched.h> to <linux/mm_types_task.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 21:40 +0100
  [PATCH 37/53] sched/headers: Move task-stack related APIs from <linux/sched.h> to <linux/sched/task_stack.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 21:50 +0100
  [PATCH 47/53] sched/headers: Move kstack_end() from <linux/sched.h> to <linux/sched/task_stack.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 22:40 +0100
  [PATCH 52/53] sched/headers: Move the get_task_struct()/put_task_struct() and related APIs from <linux/sched.h> to <linux/sched/task.h> Ingo Molnar <mingo@kernel.org> - 2017-02-09 00:10 +0100

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