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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2013-01-07 18:12:14 +0100 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2013-01-26 17:37:17 +0100 |
| commit | 95a79fd458b85132c25e351d45037ec9643312b2 (patch) | |
| tree | 7672a00be174e93e9a6ce85e610ba54d8450c3fb /kernel/context_tracking.c | |
| parent | 7d1f9aeff1ee4a20b1aeb377dd0f579fe9647619 (diff) | |
| download | lwn-95a79fd458b85132c25e351d45037ec9643312b2.tar.gz lwn-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>
Diffstat (limited to 'kernel/context_tracking.c')
| -rw-r--r-- | kernel/context_tracking.c | 16 |
1 files changed, 1 insertions, 15 deletions
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 |