linux-toradex.git/kernel/context_tracking.c, branch v3.15-rc6

asmlinkage: Add explicit __visible to drivers/, lib/, kernel/*

2014-05-05T23:07:46+00:00

As requested by Linus add explicit __visible to the asmlinkage users.
This marks functions visible to assembler.

Tree sweep for rest of tree.

Signed-off-by: Andi Kleen 
Link: http://lkml.kernel.org/r/1398984278-29319-4-git-send-email-andi@firstfloor.org
Signed-off-by: H. Peter Anvin

context_tracking: Wrap static key check into more intuitive function name

2013-12-02T19:43:14+00:00

Use a function with a meaningful name to check the global context
tracking state. static_key_false() is a bit confusing for reviewers.

Signed-off-by: Frederic Weisbecker 
Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Cc: Peter Zijlstra 
Cc: Oleg Nesterov 
Cc: Steven Rostedt

Merge tag 'v3.12-rc4' into sched/core

2013-10-09T10:36:13+00:00

Merge Linux v3.12-rc4 to fix a conflict and also to refresh the tree
before applying more scheduler patches.

Conflicts:
	arch/avr32/include/asm/Kbuild

Signed-off-by: Ingo Molnar

arm: Fix build error with context tracking calls

2013-09-27T15:59:47+00:00

ad65782fba50 (context_tracking: Optimize main APIs off case
with static key) converted context tracking main APIs to inline
function and left ARM asm callers behind.

This can be easily fixed by making ARM calling the post static
keys context tracking function. We just need to replicate the
static key checks there. We'll remove these later when ARM will
support the context tracking static keys.

Reported-by: Guenter Roeck 
Reported-by: Russell King 
Signed-off-by: Frederic Weisbecker 
Tested-by: Kevin Hilman 
Cc: Nicolas Pitre 
Cc: Anil Kumar 
Cc: Tony Lindgren 
Cc: Benoit Cousson 
Cc: Guenter Roeck 
Cc: Russell King 
Cc: Kevin Hilman

sched: Extract the basic add/sub preempt_count modifiers

2013-09-25T12:07:54+00:00

Rewrite the preempt_count macros in order to extract the 3 basic
preempt_count value modifiers:

  __preempt_count_add()
  __preempt_count_sub()

and the new:

  __preempt_count_dec_and_test()

And since we're at it anyway, replace the unconventional
$op_preempt_count names with the more conventional preempt_count_$op.

Since these basic operators are equivalent to the previous _notrace()
variants, do away with the _notrace() versions.

Signed-off-by: Peter Zijlstra 
Link: http://lkml.kernel.org/n/tip-ewbpdbupy9xpsjhg960zwbv8@git.kernel.org
Signed-off-by: Ingo Molnar

context_tracking: User/kernel broundary cross trace events

2013-08-14T15:14:48+00:00

This can be useful to track all kernel/user round trips.
And it's also helpful to debug the context tracking subsystem.

Signed-off-by: Frederic Weisbecker 
Cc: Steven Rostedt 
Cc: Paul E. McKenney 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Cc: Peter Zijlstra 
Cc: Borislav Petkov 
Cc: Li Zhong 
Cc: Mike Galbraith 
Cc: Kevin Hilman

context_tracking: Optimize context switch off case with static keys

2013-08-14T15:14:47+00:00

No need for syscall slowpath if no CPU is full dynticks,
rather nop this in this case.

Signed-off-by: Frederic Weisbecker 
Cc: Steven Rostedt 
Cc: Paul E. McKenney 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Cc: Peter Zijlstra 
Cc: Borislav Petkov 
Cc: Li Zhong 
Cc: Mike Galbraith 
Cc: Kevin Hilman

context_tracking: Optimize guest APIs off case with static key

2013-08-14T15:14:46+00:00

Optimize guest entry/exit APIs with static keys. This minimize
the overhead for those who enable CONFIG_NO_HZ_FULL without
always using it. Having no range passed to nohz_full= should
result in the probes overhead to be minimized.

Signed-off-by: Frederic Weisbecker 
Cc: Steven Rostedt 
Cc: Paul E. McKenney 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Cc: Peter Zijlstra 
Cc: Borislav Petkov 
Cc: Li Zhong 
Cc: Mike Galbraith 
Cc: Kevin Hilman

context_tracking: Optimize main APIs off case with static key

2013-08-14T15:14:45+00:00

Optimize user and exception entry/exit APIs with static
keys. This minimize the overhead for those who enable
CONFIG_NO_HZ_FULL without always using it. Having no range
passed to nohz_full= should result in the probes to be nopped
(at least we hope so...).

If this proves not be enough in the long term, we'll need
to bring an exception slow path by re-routing the exception
handlers.

Signed-off-by: Frederic Weisbecker 
Cc: Steven Rostedt 
Cc: Paul E. McKenney 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Cc: Peter Zijlstra 
Cc: Borislav Petkov 
Cc: Li Zhong 
Cc: Mike Galbraith 
Cc: Kevin Hilman

context_tracking: Ground setup for static key use

2013-08-14T15:12:46+00:00

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 
Cc: Steven Rostedt 
Cc: Paul E. McKenney 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Cc: Peter Zijlstra 
Cc: Borislav Petkov 
Cc: Li Zhong 
Cc: Mike Galbraith 
Cc: Kevin Hilman