litmus-rt.git/Documentation/locking, branch test

Merge tag 'docs-for-linus' of git://git.lwn.net/linux-2.6

2015-02-11T21:03:11+00:00

Pull documentation updates from Jonathan Corbet:
 "Highlights this time around include:

   - A thrashing of SubmittingPatches to bring it out of the "send
     everything to Linus" era of kernel development.

   - A new document on completions from Nicholas McGuire

   - Lots of typo fixes, formatting improvements, corrections, build
     fixes, and more"

* tag 'docs-for-linus' of git://git.lwn.net/linux-2.6: (35 commits)
  Documentation: Fix the wrong command `echo -1 > set_ftrace_pid` for cleaning the filter.
  can-doc: Fixed a wrong filepath in can.txt
  Documentation: Fix trivial typo in comment.
  kgdb,docs: Fix typo and minor style issues
  Documentation: add description for FTRACE probe status
  doc: brief user documentation for completion
  Documentation/misc-devices/mei: Fix indentation of embedded code.
  Documentation/misc-devices/mei: Fix indentation of enumeration.
  Documentation/misc-devices/mei: Fix spacing around parentheses.
  Documentation/misc-devices/mei: Fix formatting of headings.
  Documentation: devicetree: Fix double words in Doumentation/devicetree
  Documentation: mm: Fix typo in vm.txt
  lockstat: Add documentation on contention and contenting points
  Documentation: fix blackfin gptimers-example build errors
  Fixes column alignment in table of contents entry 1.9 in Documentation/filesystems/proc.txt
  CodingStyle: enable emacs display of trailing whitespace
  DocBook: Do not exceed argument list limit
  gpio: board.txt: Fix the gpio name example
  Documentation/SubmittingPatches: unify whitespace/tabs for the DCO
  MAINTAINERS: Add the docs-next git tree to the maintainer entry
  ...

lockstat: Add documentation on contention and contenting points

2015-01-28T22:13:10+00:00

Signed-off-by: Daniel Wagner 
Cc: Peter Zijlstra 
Cc: Ingo Molnar 
Cc: Jonathan Corbet 
Signed-off-by: Jonathan Corbet

locking/Documentation: Update code path

2015-01-16T08:09:21+00:00

lockdep code has been moved from kernel/ to kernel/locking/ by commit
8eddac3f103736163f49255bcb109edadea167f6 ("locking: Move the lockdep
code to kernel/locking/"). But, path to lockdep code in document was not
updated.

This commit updates the path.

Signed-off-by: SeongJae Park 
Signed-off-by: Peter Zijlstra (Intel) 
Link: http://lkml.kernel.org/r/1421176921-27688-1-git-send-email-sj38.park@gmail.com
Cc: Jonathan Corbet 
Cc: Linus Torvalds 
Cc: linux-doc@vger.kernel.org
Signed-off-by: Ingo Molnar

Update of Documentation/00-INDEX

2014-12-29T22:27:54+00:00

Added files
- hsi.txt was added by 3a8ab8af (HSI: Add some general description for
  the HSI subsystem)
- lzo.txt was added by d98a0526 (lzo: document part of the encoding)
- xillybus.txt was added by 7051924f (xillybus: Move out of staging)
- mailbox.txt was added by 15320fbc (add documentation for mailbox
  framework)

Moved files
- xommit 214e0aed (Move locking related docs into Documentation/locking/):
  * lockdep-design.txt
  * lockstat.txt
  * mutex-design.txt
  * rt-mutex-design.txt
  * rt-mutex.txt
  * spinlocks.txt
  * ww-mutex-design.txt
- kselftest.txt was moved by 3c415707 (kselftest: Move the docs to the
  Documentation dir)

CC: Davidlohr Bueso 
CC: Willy Tarreau 
CC: Randy Dunlap 
CC: Greg Kroah-Hartman 
CC: Sebastian Reichel 
CC: Eli Billauer 
CC: Jonathan Corbet 
CC: Jiri Kosina 
CC: linux-doc@vger.kernel.org
CC: linux-kernel@vger.kernel.org
Cc: Tim Bird 
Cc: Shuah Khan 

Signed-off-by: Henrik Austad 
Signed-off-by: Jonathan Corbet

Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2014-12-10T03:59:22+00:00

Pull locking tree changes from Ingo Molnar:
 "Two changes: a documentation update and a ticket locks live lock fix"

* 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/ticketlock: Fix spin_unlock_wait() livelock
  locking/lglocks: Add documentation of current lglocks implementation

locking/lglocks: Add documentation of current lglocks implementation

2014-12-08T08:55:00+00:00

Local/global locks are currently not documented anywhere other
than in an somewhat out-of-date LWN article - this is an attempt
to document the current state of lglocks.

This patch is against linux-next 3.18.0-rc6

Signed-off-by: Nicholas Mc Guire 
Cc: Paul E. McKenney 
Cc: Carsten Emde 
Cc: Steven Rostedt 
Cc: Jonathan Corbet 
Cc: Linus Torvalds 
Cc: Andrew Morton 
Cc: Peter Zijlstra 
Link: http://lkml.kernel.org/r/20141208083326.GA29895@opentech.at
Signed-off-by: Ingo Molnar

Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2014-10-13T13:51:40+00:00

Pull core locking updates from Ingo Molnar:
 "The main updates in this cycle were:

   - mutex MCS refactoring finishing touches: improve comments, refactor
     and clean up code, reduce debug data structure footprint, etc.

   - qrwlock finishing touches: remove old code, self-test updates.

   - small rwsem optimization

   - various smaller fixes/cleanups"

* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  locking/lockdep: Revert qrwlock recusive stuff
  locking/rwsem: Avoid double checking before try acquiring write lock
  locking/rwsem: Move EXPORT_SYMBOL() lines to follow function definition
  locking/rwlock, x86: Delete unused asm/rwlock.h and rwlock.S
  locking/rwlock, x86: Clean up asm/spinlock*.h to remove old rwlock code
  locking/semaphore: Resolve some shadow warnings
  locking/selftest: Support queued rwlock
  locking/lockdep: Restrict the use of recursive read_lock() with qrwlock
  locking/spinlocks: Always evaluate the second argument of spin_lock_nested()
  locking/Documentation: Update locking/mutex-design.txt disadvantages
  locking/Documentation: Move locking related docs into Documentation/locking/
  locking/mutexes: Use MUTEX_SPIN_ON_OWNER when appropriate
  locking/mutexes: Refactor optimistic spinning code
  locking/mcs: Remove obsolete comment
  locking/mutexes: Document quick lock release when unlocking
  locking/mutexes: Standardize arguments in lock/unlock slowpaths
  locking: Remove deprecated smp_mb__() barriers

locktorture: Support rwlocks

2014-09-30T07:10:00+00:00

Add a "rw_lock" torture test to stress kernel rwlocks and their irq
variant. Reader critical regions are 5x longer than writers. As such
a similar ratio of lock acquisitions is seen in the statistics. In the
case of massive contention, both hold the lock for 1/10 of a second.

Signed-off-by: Davidlohr Bueso 
Signed-off-by: Paul E. McKenney

locktorture: Support rwsems

2014-09-16T20:41:36+00:00

We can easily do so with our new reader lock support. Just an arbitrary
design default: readers have higher (5x) critical region latencies than
writers: 50 ms and 10 ms, respectively.

Signed-off-by: Davidlohr Bueso 
Signed-off-by: Paul E. McKenney

locktorture: Add infrastructure for torturing read locks

2014-09-16T20:41:07+00:00

Most of it is based on what we already have for writers. This allows
readers to be very independent (and thus configurable), enabling
future module parameters to control things such as rw distribution.
Furthermore, readers have their own delaying function, allowing us
to test different rw critical region latencies, and stress locking
internals. Similarly, statistics, for now will only serve for the
number of lock acquisitions -- as opposed to writers, readers have
no failure detection.

In addition, introduce a new nreaders_stress module parameter. The
default number of readers will be the same number of writers threads.
Writer threads are interleaved with readers. Documentation is updated,
respectively.

Signed-off-by: Davidlohr Bueso 
Signed-off-by: Paul E. McKenney