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authorFrederic Weisbecker <fweisbec@gmail.com>2013-07-24 23:52:27 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2013-08-14 17:14:58 +0200
commitd13508f9440e46dccac6a2dd48d51a73b2207482 (patch)
tree880feb6b503b5c450ba27b589aae7461626ffc74 /include
parent460775df4680b4593d8449bc171008578625a850 (diff)
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nohz: Optimize full dynticks's sched hooks with static keys
Scheduler IPIs and task context switches are serious fast path. Let's try to hide as much as we can the impact of full dynticks APIs' off case that are called on these sites through the use of static keys. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Li Zhong <zhong@linux.vnet.ibm.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Kevin Hilman <khilman@linaro.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/tick.h20
1 files changed, 16 insertions, 4 deletions
diff --git a/include/linux/tick.h b/include/linux/tick.h
index c60b079e1b37..a7ef1d6fceb6 100644
--- a/include/linux/tick.h
+++ b/include/linux/tick.h
@@ -180,20 +180,32 @@ static inline bool tick_nohz_full_cpu(int cpu)
}
extern void tick_nohz_init(void);
-extern void tick_nohz_full_check(void);
+extern void __tick_nohz_full_check(void);
extern void tick_nohz_full_kick(void);
extern void tick_nohz_full_kick_all(void);
-extern void tick_nohz_task_switch(struct task_struct *tsk);
+extern void __tick_nohz_task_switch(struct task_struct *tsk);
#else
static inline void tick_nohz_init(void) { }
static inline bool tick_nohz_full_enabled(void) { return false; }
static inline bool tick_nohz_full_cpu(int cpu) { return false; }
-static inline void tick_nohz_full_check(void) { }
+static inline void __tick_nohz_full_check(void) { }
static inline void tick_nohz_full_kick(void) { }
static inline void tick_nohz_full_kick_all(void) { }
-static inline void tick_nohz_task_switch(struct task_struct *tsk) { }
+static inline void __tick_nohz_task_switch(struct task_struct *tsk) { }
#endif
+static inline void tick_nohz_full_check(void)
+{
+ if (tick_nohz_full_enabled())
+ __tick_nohz_full_check();
+}
+
+static inline void tick_nohz_task_switch(struct task_struct *tsk)
+{
+ if (tick_nohz_full_enabled())
+ __tick_nohz_task_switch(tsk);
+}
+
# ifdef CONFIG_CPU_IDLE_GOV_MENU
extern void menu_hrtimer_cancel(void);