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From: John Baldwin <jhb@FreeBSD.org>
Date: Wed, 28 Mar 2001 01:03:24 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/alpha/alpha machdep.c src/sys/alpha/include
         globaldata.h src/sys/conf files src/sys/i386/i386 machdep.c
         mp_machdep.c src/sys/i386/include globaldata.h src/sys/ia64/ia64
         machdep.c src/sys/ia64/include globaldata.h src/sys/kern ...
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jhb         2001/03/28 01:03:24 PST

  Modified files:
    sys/alpha/alpha      machdep.c 
    sys/alpha/include    globaldata.h 
    sys/conf             files 
    sys/i386/i386        machdep.c mp_machdep.c 
    sys/i386/include     globaldata.h 
    sys/ia64/ia64        machdep.c 
    sys/ia64/include     globaldata.h 
    sys/kern             kern_condvar.c kern_fork.c kern_mutex.c 
                         kern_sx.c kern_synch.c subr_witness.c 
    sys/sys              kernel.h lock.h mutex.h proc.h sx.h 
  Log:
  Rework the witness code to work with sx locks as well as mutexes.
  - Introduce lock classes and lock objects.  Each lock class specifies a
    name and set of flags (or properties) shared by all locks of a given
    type.  Currently there are three lock classes: spin mutexes, sleep
    mutexes, and sx locks.  A lock object specifies properties of an
    additional lock along with a lock name and all of the extra stuff needed
    to make witness work with a given lock.  This abstract lock stuff is
    defined in sys/lock.h.  The lockmgr constants, types, and prototypes have
    been moved to sys/lockmgr.h.  For temporary backwards compatability,
    sys/lock.h includes sys/lockmgr.h.
  - Replace proc->p_spinlocks with a per-CPU list, PCPU(spinlocks), of spin
    locks held.  By making this per-cpu, we do not have to jump through
    magic hoops to deal with sched_lock changing ownership during context
    switches.
  - Replace proc->p_heldmtx, formerly a list of held sleep mutexes, with
    proc->p_sleeplocks, which is a list of held sleep locks including sleep
    mutexes and sx locks.
  - Add helper macros for logging lock events via the KTR_LOCK KTR logging
    level so that the log messages are consistent.
  - Add some new flags that can be passed to mtx_init():
    - MTX_NOWITNESS - specifies that this lock should be ignored by witness.
      This is used for the mutex that blocks a sx lock for example.
    - MTX_QUIET - this is not new, but you can pass this to mtx_init() now
      and no events will be logged for this lock, so that one doesn't have
      to change all the individual mtx_lock/unlock() operations.
  - All lock objects maintain an initialized flag.  Use this flag to export
    a mtx_initialized() macro that can be safely called from drivers.  Also,
    we on longer walk the all_mtx list if MUTEX_DEBUG is defined as witness
    performs the corresponding checks using the initialized flag.
  - The lock order reversal messages have been improved to output slightly
    more accurate file and line numbers.
  
  Revision  Changes     Path
  1.119     +2 -3       src/sys/alpha/alpha/machdep.c
  1.8       +2 -2       src/sys/alpha/include/globaldata.h
  1.504     +2 -1       src/sys/conf/files
  1.446     +3 -2       src/sys/i386/i386/machdep.c
  1.149     +2 -1       src/sys/i386/i386/mp_machdep.c
  1.25      +2 -1       src/sys/i386/include/globaldata.h
  1.27      +2 -2       src/sys/ia64/ia64/machdep.c
  1.8       +2 -2       src/sys/ia64/include/globaldata.h
  1.6       +9 -9       src/sys/kern/kern_condvar.c
  1.109     +2 -3       src/sys/kern/kern_fork.c
  1.59      +119 -1125  src/sys/kern/kern_mutex.c
  1.4       +63 -10     src/sys/kern/kern_sx.c
  1.132     +7 -7       src/sys/kern/kern_synch.c
  1.59      +707 -1270  src/sys/kern/subr_witness.c
  1.85      +2 -2       src/sys/sys/kernel.h
  1.28      +173 -187   src/sys/sys/lock.h
  1.29      +52 -108    src/sys/sys/mutex.h
  1.156     +2 -2       src/sys/sys/proc.h
  1.6       +18 -10     src/sys/sys/sx.h


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