svn commit: r41036 - head/en_US.ISO8859-1/books/faq
Eitan Adler
eadler at FreeBSD.org
Sat Feb 23 14:50:25 UTC 2013
Author: eadler
Date: Sat Feb 23 14:50:24 2013
New Revision: 41036
URL: http://svnweb.freebsd.org/changeset/doc/41036
Log:
Update the lock-order-reversal question
PR: docs/174226
Submitted by: Bas Smeelen <b.smeelen at ose.nl>
Reviewed by: Erich Dollansky <erichsfreebsdlist at alogt.com>
Reviewed by: avg
Reviewed by: bjk
Discussed with: wblock
Approved by: ??? (mentor)
Modified:
head/en_US.ISO8859-1/books/faq/book.xml
Modified: head/en_US.ISO8859-1/books/faq/book.xml
==============================================================================
--- head/en_US.ISO8859-1/books/faq/book.xml Sat Feb 23 14:49:59 2013 (r41035)
+++ head/en_US.ISO8859-1/books/faq/book.xml Sat Feb 23 14:50:24 2013 (r41036)
@@ -2493,9 +2493,19 @@ kern.timecounter.hardware: TSC -> i82
</question>
<answer>
- <para>An answer for this question can be found in the &os;
- Glossary, see <ulink
- url="&url.books.handbook;/freebsd-glossary.html#lor-glossary">LOR</ulink>.</para>
+ <para>The &os; kernel uses a number of resource locks to
+ arbitrate contention for certain resources. A run-time
+ lock diagnostic system found in &os.current; kernels
+ (but removed for releases), called &man.witness.4;,
+ detects the potential for deadlocks due to locking errors.
+ (It is possible to get false positives, as &man.witness.4;
+ is slightly conservative.) A true positive report
+ indicates that "if you were unlucky, a deadlock would have
+ happened here">.</para>
+
+ <para>Problematic <acronym>LOR</acronym>s tend to get fixed
+ quickly, so check &a.current.url; before posting to the
+ mailing lists.</para>
</answer>
</qandaentry>
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