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From: Joseph Koshy <jkoshy@FreeBSD.org>
Date: Thu, 19 Apr 2007 08:02:51 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
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Cc: 
Subject: cvs commit: src/sys/kern subr_witness.c src/sys/dev/hwpmc
 hwpmc_logging.c hwpmc_mod.c hwpmc_piv.c
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jkoshy      2007-04-19 08:02:51 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             subr_witness.c 
    sys/dev/hwpmc        hwpmc_logging.c hwpmc_mod.c hwpmc_piv.c 
  Log:
  Fix witness(4) warnings about mutex use.
  
  Group mutexes used in hwpmc(4) into 3 "types" in the sense of
  witness(4):
  
   - leaf spin mutexes---only one of these should be held at a time,
     so these mutexes are specified as belonging to a single witness
     type "pmc-leaf".
  
   - `struct pmc_owner' descriptors are protected by a spin mutex of
     witness type "pmc-owner-proc".  Since we call wakeup_one() while
     holding these mutexes, the witness type of these mutexes needs
     to dominate that of "sleepq chain" mutexes.
  
   - logger threads use a sleep mutex, of type "pmc-sleep".
  
  Submitted by:   wkoszek (earlier patch)
  
  Revision  Changes    Path
  1.7       +3 -2      src/sys/dev/hwpmc/hwpmc_logging.c
  1.28      +26 -17    src/sys/dev/hwpmc/hwpmc_mod.c
  1.14      +1 -1      src/sys/dev/hwpmc/hwpmc_piv.c
  1.230     +10 -0     src/sys/kern/subr_witness.c