diff options
author | Frederic Weisbecker <fweisbec@gmail.com> | 2013-07-11 13:12:32 -0400 |
---|---|---|
committer | Frederic Weisbecker <fweisbec@gmail.com> | 2013-08-14 11:12:46 -0400 |
commit | 65f382fd0c8fa483713c0971de9f1dfb4cf1ad9c (patch) | |
tree | dec89c43fcfb4934611bae4855293428382856b9 /include/linux/context_tracking.h | |
parent | d84d27a491880b9902b45c09be8d9e9464fb9b74 (diff) |
context_tracking: Ground setup for static key use
Prepare for using a static key in the context tracking subsystem.
This will help optimizing the off case on its many users:
* user_enter, user_exit, exception_enter, exception_exit, guest_enter,
guest_exit, vtime_*()
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/linux/context_tracking.h')
-rw-r--r-- | include/linux/context_tracking.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h index 1ae37c708c63..c138c24bad1a 100644 --- a/include/linux/context_tracking.h +++ b/include/linux/context_tracking.h | |||
@@ -4,6 +4,7 @@ | |||
4 | #include <linux/sched.h> | 4 | #include <linux/sched.h> |
5 | #include <linux/percpu.h> | 5 | #include <linux/percpu.h> |
6 | #include <linux/vtime.h> | 6 | #include <linux/vtime.h> |
7 | #include <linux/static_key.h> | ||
7 | #include <asm/ptrace.h> | 8 | #include <asm/ptrace.h> |
8 | 9 | ||
9 | struct context_tracking { | 10 | struct context_tracking { |
@@ -22,6 +23,7 @@ struct context_tracking { | |||
22 | 23 | ||
23 | 24 | ||
24 | #ifdef CONFIG_CONTEXT_TRACKING | 25 | #ifdef CONFIG_CONTEXT_TRACKING |
26 | extern struct static_key context_tracking_enabled; | ||
25 | DECLARE_PER_CPU(struct context_tracking, context_tracking); | 27 | DECLARE_PER_CPU(struct context_tracking, context_tracking); |
26 | 28 | ||
27 | static inline bool context_tracking_in_user(void) | 29 | static inline bool context_tracking_in_user(void) |
@@ -67,6 +69,14 @@ static inline void context_tracking_task_switch(struct task_struct *prev, | |||
67 | struct task_struct *next) { } | 69 | struct task_struct *next) { } |
68 | #endif /* !CONFIG_CONTEXT_TRACKING */ | 70 | #endif /* !CONFIG_CONTEXT_TRACKING */ |
69 | 71 | ||
72 | |||
73 | #ifdef CONFIG_CONTEXT_TRACKING_FORCE | ||
74 | extern void context_tracking_init(void); | ||
75 | #else | ||
76 | static inline void context_tracking_init(void) { } | ||
77 | #endif /* CONFIG_CONTEXT_TRACKING_FORCE */ | ||
78 | |||
79 | |||
70 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN | 80 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN |
71 | extern void guest_enter(void); | 81 | extern void guest_enter(void); |
72 | extern void guest_exit(void); | 82 | extern void guest_exit(void); |