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authorFrederic Weisbecker <fweisbec@gmail.com>2013-01-07 18:12:14 +0100
committerFrederic Weisbecker <fweisbec@gmail.com>2013-01-26 17:37:17 +0100
commit95a79fd458b85132c25e351d45037ec9643312b2 (patch)
tree7672a00be174e93e9a6ce85e610ba54d8450c3fb
parentLinux 3.8-rc4 (diff)
downloadlinux-95a79fd458b85132c25e351d45037ec9643312b2.tar.xz
linux-95a79fd458b85132c25e351d45037ec9643312b2.zip
context_tracking: Export context state for generic vtime
Export the context state: whether we run in user / kernel from the context tracking subsystem point of view. This is going to be used by the generic virtual cputime accounting subsystem that is needed to implement the full dynticks. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Li Zhong <zhong@linux.vnet.ibm.com> Cc: Namhyung Kim <namhyung.kim@lge.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--include/linux/context_tracking.h28
-rw-r--r--kernel/context_tracking.c16
2 files changed, 29 insertions, 15 deletions
diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
index e24339ccb7f0..b28d161c1091 100644
--- a/include/linux/context_tracking.h
+++ b/include/linux/context_tracking.h
@@ -3,12 +3,40 @@
#ifdef CONFIG_CONTEXT_TRACKING
#include <linux/sched.h>
+#include <linux/percpu.h>
+
+struct context_tracking {
+ /*
+ * When active is false, probes are unset in order
+ * to minimize overhead: TIF flags are cleared
+ * and calls to user_enter/exit are ignored. This
+ * may be further optimized using static keys.
+ */
+ bool active;
+ enum {
+ IN_KERNEL = 0,
+ IN_USER,
+ } state;
+};
+
+DECLARE_PER_CPU(struct context_tracking, context_tracking);
+
+static inline bool context_tracking_in_user(void)
+{
+ return __this_cpu_read(context_tracking.state) == IN_USER;
+}
+
+static inline bool context_tracking_active(void)
+{
+ return __this_cpu_read(context_tracking.active);
+}
extern void user_enter(void);
extern void user_exit(void);
extern void context_tracking_task_switch(struct task_struct *prev,
struct task_struct *next);
#else
+static inline bool context_tracking_in_user(void) { return false; }
static inline void user_enter(void) { }
static inline void user_exit(void) { }
static inline void context_tracking_task_switch(struct task_struct *prev,
diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
index e0e07fd55508..54f471e536dc 100644
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -1,24 +1,10 @@
#include <linux/context_tracking.h>
#include <linux/rcupdate.h>
#include <linux/sched.h>
-#include <linux/percpu.h>
#include <linux/hardirq.h>
-struct context_tracking {
- /*
- * When active is false, hooks are not set to
- * minimize overhead: TIF flags are cleared
- * and calls to user_enter/exit are ignored. This
- * may be further optimized using static keys.
- */
- bool active;
- enum {
- IN_KERNEL = 0,
- IN_USER,
- } state;
-};
-static DEFINE_PER_CPU(struct context_tracking, context_tracking) = {
+DEFINE_PER_CPU(struct context_tracking, context_tracking) = {
#ifdef CONFIG_CONTEXT_TRACKING_FORCE
.active = true,
#endif