Date: Sat, 23 Feb 2013 14:50:25 +0000 (UTC) From: Eitan Adler <eadler@FreeBSD.org> To: doc-committers@freebsd.org, svn-doc-all@freebsd.org, svn-doc-head@freebsd.org Subject: svn commit: r41036 - head/en_US.ISO8859-1/books/faq Message-ID: <201302231450.r1NEoPwK036450@svn.freebsd.org>
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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@ose.nl> Reviewed by: Erich Dollansky <erichsfreebsdlist@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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