22 Sep, 2016
1 commit
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It is now unused, remove it before someone else thinks its a good idea
to use this.Signed-off-by: Peter Zijlstra (Intel)
Cc: Linus Torvalds
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar
28 Apr, 2016
1 commit
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Signed-off-by: Eric Engestrom
Signed-off-by: Peter Zijlstra (Intel)
Cc: Jonathan Corbet
Cc: Linus Torvalds
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Link: http://lkml.kernel.org/r/1461566229-4717-2-git-send-email-eric@engestrom.ch
Signed-off-by: Ingo Molnar
04 Nov, 2015
1 commit
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Pull locking changes from Ingo Molnar:
"The main changes in this cycle were:- More gradual enhancements to atomic ops: new atomic*_read_ctrl()
ops, synchronize atomic_{read,set}() ordering requirements between
architectures, add atomic_long_t bitops. (Peter Zijlstra)- Add _{relaxed|acquire|release}() variants for inc/dec atomics and
use them in various locking primitives: mutex, rtmutex, mcs, rwsem.
This enables weakly ordered architectures (such as arm64) to make
use of more locking related optimizations. (Davidlohr Bueso)- Implement atomic[64]_{inc,dec}_relaxed() on ARM. (Will Deacon)
- Futex kernel data cache footprint micro-optimization. (Rasmus
Villemoes)- pvqspinlock runtime overhead micro-optimization. (Waiman Long)
- misc smaller fixlets"
* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
ARM, locking/atomics: Implement _relaxed variants of atomic[64]_{inc,dec}
locking/rwsem: Use acquire/release semantics
locking/mcs: Use acquire/release semantics
locking/rtmutex: Use acquire/release semantics
locking/mutex: Use acquire/release semantics
locking/asm-generic: Add _{relaxed|acquire|release}() variants for inc/dec atomics
atomic: Implement atomic_read_ctrl()
atomic, arch: Audit atomic_{read,set}()
atomic: Add atomic_long_t bitops
futex: Force hot variables into a single cache line
locking/pvqspinlock: Kick the PV CPU unconditionally when _Q_SLOW_VAL
locking/osq: Relax atomic semantics
locking/qrwlock: Rename ->lock to ->wait_lock
locking/Documentation/lockstat: Fix typo - lokcing -> locking
locking/atomics, cmpxchg: Privatize the inclusion of asm/cmpxchg.h
07 Oct, 2015
1 commit
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Real time mutexes is one of the few general primitives
that we do not have in locktorture. Address this -- a few
considerations:o To spice things up, enable competing thread(s) to become
rt, such that we can stress different prio boosting paths
in the rtmutex code. Introduce a ->task_boost callback,
only used by rtmutex-torturer. Tasks will boost/deboost
around every 50k (arbitrarily) lock/unlock operations.o Hold times are similar to what we have for other locks:
only occasionally having longer hold times (per ~200k ops).
So we roughly do two full rt boost+deboosting ops with
short hold times.Signed-off-by: Davidlohr Bueso
Signed-off-by: Paul E. McKenney
Reviewed-by: Josh Triplett
18 Sep, 2015
1 commit
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Signed-off-by: Stephen Boyd
Signed-off-by: Peter Zijlstra (Intel)
Cc: Andrew Morton
Cc: Jiri Kosina
Cc: Jonathan Corbet
Cc: Linus Torvalds
Cc: Paul E. McKenney
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Link: http://lkml.kernel.org/r/1441842398-25063-1-git-send-email-sboyd@codeaurora.org
Signed-off-by: Ingo Molnar
12 Feb, 2015
1 commit
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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
...
29 Jan, 2015
1 commit
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Signed-off-by: Daniel Wagner
Cc: Peter Zijlstra
Cc: Ingo Molnar
Cc: Jonathan Corbet
Signed-off-by: Jonathan Corbet
16 Jan, 2015
1 commit
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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
30 Dec, 2014
1 commit
-
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 KhanSigned-off-by: Henrik Austad
Signed-off-by: Jonathan Corbet
10 Dec, 2014
1 commit
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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
08 Dec, 2014
1 commit
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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
13 Oct, 2014
1 commit
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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
30 Sep, 2014
1 commit
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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
17 Sep, 2014
4 commits
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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 -
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 -
Add a "mutex_lock" torture test. The main difference with the already
existing spinlock tests is that the latency of the critical region
is much larger. We randomly delay for (arbitrarily) either 500 ms or,
otherwise, 25 ms. While this can considerably reduce the amount of
writes compared to non blocking locks, if run long enough it can have
the same torturous effect. Furthermore it is more representative of
mutex hold times and can stress better things like thrashing.Signed-off-by: Davidlohr Bueso
Signed-off-by: Paul E. McKenney -
Just like Documentation/RCU/torture.txt, begin a document for the
locktorture module. This module is still pretty green, so I have
just added some specific sections to the doc (general desc, params,
usage, etc.). Further development should update the file.Signed-off-by: Davidlohr Bueso
[ paulmck: Apply Randy Dunlap review comments. ]
Signed-off-by: Paul E. McKenney
13 Aug, 2014
2 commits
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Fortunately Jason was able to reduce some of the overhead we
had introduced in the original rwsem optimistic spinning -
an it is now the same size as mutexes. Update the documentation
accordingly.Signed-off-by: Davidlohr Bueso
Acked-by: Jason Low
Signed-off-by: Peter Zijlstra
Cc: aswin@hp.com
Cc: Linus Torvalds
Cc: Randy Dunlap
Link: http://lkml.kernel.org/r/1406752916-3341-7-git-send-email-davidlohr@hp.com
Signed-off-by: Ingo Molnar -
Specifically:
Documentation/locking/lockdep-design.txt
Documentation/locking/lockstat.txt
Documentation/locking/mutex-design.txt
Documentation/locking/rt-mutex-design.txt
Documentation/locking/rt-mutex.txt
Documentation/locking/spinlocks.txt
Documentation/locking/ww-mutex-design.txtSigned-off-by: Davidlohr Bueso
Acked-by: Randy Dunlap
Signed-off-by: Peter Zijlstra
Cc: jason.low2@hp.com
Cc: aswin@hp.com
Cc: Alexei Starovoitov
Cc: Al Viro
Cc: Andrew Morton
Cc: Chris Mason
Cc: Dan Streetman
Cc: David Airlie
Cc: Davidlohr Bueso
Cc: David S. Miller
Cc: Greg Kroah-Hartman
Cc: Heiko Carstens
Cc: Jason Low
Cc: Josef Bacik
Cc: Kees Cook
Cc: Linus Torvalds
Cc: Lubomir Rintel
Cc: Masanari Iida
Cc: Paul E. McKenney
Cc: Randy Dunlap
Cc: Tim Chen
Cc: Vineet Gupta
Cc: fengguang.wu@intel.com
Link: http://lkml.kernel.org/r/1406752916-3341-6-git-send-email-davidlohr@hp.com
Signed-off-by: Ingo Molnar
