Date: Wed, 9 Jul 2003 11:41:34 -0700 (PDT) From: Don Lewis <truckman@FreeBSD.org> To: current@FreeBSD.org Subject: CFR: patch to support creation of multiple mutex pools Message-ID: <200307091841.h69IfYM7013486@gw.catspoiler.org>
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The patch below enhances the mutex pool code to support the creation and use of multiple mutex pools. It creates one pool of sleep mutexes with the MTX_NOWITNESS flag for use in building higher level (sx and lockmgr) locks. It also creates another pool without MTX_NOWITNESS for general purpose use. It can also be used to create pools of spin mutexes. The users of the existing MTX_NOWITNESS pool are modified to use the appropriate pool. If this had been implemented earlier, it would have allowed witness to catch the Giant vs. FILE_LOCK() lock order reversal that I recently tracked down and fixed. I've tested this only on i386, but it also passes the "make universe" test.
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