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authorFrederic Weisbecker <fweisbec@gmail.com>2012-11-27 19:33:25 +0100
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-11-30 11:40:07 -0800
commit91d1aa43d30505b0b825db8898ffc80a8eca96c7 (patch)
tree911636f846d800c8a44efd540842dc726ec7c191 /arch/Kconfig
parent4e79752c25ec221ac1e28f8875b539ed7631a0db (diff)
downloadkernel-91d1aa43d30505b0b825db8898ffc80a8eca96c7.tar.gz
context_tracking: New context tracking susbsystem
Create a new subsystem that probes on kernel boundaries to keep track of the transitions between level contexts with two basic initial contexts: user or kernel. This is an abstraction of some RCU code that use such tracking to implement its userspace extended quiescent state. We need to pull this up from RCU into this new level of indirection because this tracking is also going to be used to implement an "on demand" generic virtual cputime accounting. A necessary step to shutdown the tick while still accounting the cputime. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Li Zhong <zhong@linux.vnet.ibm.com> Cc: Gilad Ben-Yossef <gilad@benyossef.com> Reviewed-by: Steven Rostedt <rostedt@goodmis.org> [ paulmck: fix whitespace error and email address. ] Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'arch/Kconfig')
-rw-r--r--arch/Kconfig15
1 files changed, 8 insertions, 7 deletions
diff --git a/arch/Kconfig b/arch/Kconfig
index 366ec06a5185..cc74aaea116c 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -300,15 +300,16 @@ config SECCOMP_FILTER
See Documentation/prctl/seccomp_filter.txt for details.
-config HAVE_RCU_USER_QS
+config HAVE_CONTEXT_TRACKING
bool
help
- Provide kernel entry/exit hooks necessary for userspace
- RCU extended quiescent state. Syscalls need to be wrapped inside
- rcu_user_exit()-rcu_user_enter() through the slow path using
- TIF_NOHZ flag. Exceptions handlers must be wrapped as well. Irqs
- are already protected inside rcu_irq_enter/rcu_irq_exit() but
- preemption or signal handling on irq exit still need to be protected.
+ Provide kernel/user boundaries probes necessary for subsystems
+ that need it, such as userspace RCU extended quiescent state.
+ Syscalls need to be wrapped inside user_exit()-user_enter() through
+ the slow path using TIF_NOHZ flag. Exceptions handlers must be
+ wrapped as well. Irqs are already protected inside
+ rcu_irq_enter/rcu_irq_exit() but preemption or signal handling on
+ irq exit still need to be protected.
config HAVE_VIRT_CPU_ACCOUNTING
bool