cvs commit: src/sys/kern subr_witness.c src/sys/dev/hwpmc hwpmc_logging.c hwpmc_mod.c hwpmc_piv.c

Joseph Koshy jkoshy at
Thu Apr 19 08:02:52 UTC 2007

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 
  Fix witness(4) warnings about mutex use.
  Group mutexes used in hwpmc(4) into 3 "types" in the sense of
   - 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

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