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authorLinus Torvalds <torvalds@linux-foundation.org>2015-02-11 13:03:11 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-11 13:03:11 -0800
commit73b4f63aebd6d57db4ca1d31fa6f8516651207b0 (patch)
tree49adf7fb3b8f45d040f7e633ba34040541279c28 /Documentation/locking
parentbfe9183fdcc0575a648d1401facc649888a1f49a (diff)
parent52e68924dfa8d9de5d82f6798352eecc5f03a97d (diff)
Merge tag 'docs-for-linus' of git://git.lwn.net/linux-2.6
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 ...
Diffstat (limited to 'Documentation/locking')
-rw-r--r--Documentation/locking/00-INDEX16
-rw-r--r--Documentation/locking/lockstat.txt5
2 files changed, 21 insertions, 0 deletions
diff --git a/Documentation/locking/00-INDEX b/Documentation/locking/00-INDEX
new file mode 100644
index 000000000000..c256c9bee2a4
--- /dev/null
+++ b/Documentation/locking/00-INDEX
@@ -0,0 +1,16 @@
+00-INDEX
+ - this file.
+lockdep-design.txt
+ - documentation on the runtime locking correctness validator.
+lockstat.txt
+ - info on collecting statistics on locks (and contention).
+mutex-design.txt
+ - info on the generic mutex subsystem.
+rt-mutex-design.txt
+ - description of the RealTime mutex implementation design.
+rt-mutex.txt
+ - desc. of RT-mutex subsystem with PI (Priority Inheritance) support.
+spinlocks.txt
+ - info on using spinlocks to provide exclusive access in kernel.
+ww-mutex-design.txt
+ - Intro to Mutex wait/would deadlock handling.s
diff --git a/Documentation/locking/lockstat.txt b/Documentation/locking/lockstat.txt
index 7428773a1e69..568bbbacee91 100644
--- a/Documentation/locking/lockstat.txt
+++ b/Documentation/locking/lockstat.txt
@@ -121,6 +121,11 @@ show the header with column descriptions. Lines 05-18 and 20-31 show the actual
statistics. These statistics come in two parts; the actual stats separated by a
short separator (line 08, 13) from the contention points.
+Lines 09-12 show the first 4 recorded contention points (the code
+which tries to get the lock) and lines 14-17 show the first 4 recorded
+contended points (the lock holder). It is possible that the max
+con-bounces point is missing in the statistics.
+
The first lock (05-18) is a read/write lock, and shows two lines above the
short separator. The contention points don't match the column descriptors,
they have two: contentions and [<IP>] symbol. The second set of contention