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From: Bosko Milekic <bmilekic@FreeBSD.org>
Date: Fri, 29 Sep 2000 23:30:40 -0700 (PDT)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/alpha/alpha machdep.c src/sys/i386/i386
         machdep.c src/sys/kern uipc_mbuf.c src/sys/pc98/i386 machdep.c
         src/sys/sys kernel.h mbuf.h
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bmilekic    2000/09/29 23:30:40 PDT

  Modified files:
    sys/alpha/alpha      machdep.c 
    sys/i386/i386        machdep.c 
    sys/kern             uipc_mbuf.c 
    sys/pc98/i386        machdep.c 
    sys/sys              kernel.h mbuf.h 
  Log:
   Big mbuf subsystem diff #1: incorporate mutexes and fix things up somewhat
   to accomodate the changes.
  
   Here's a list of things that have changed (I may have left out a few); for a
   relatively complete list, see http://people.freebsd.org/~bmilekic/mtx_journal
  
     * Remove old (once useful) mcluster code for MCLBYTES > PAGE_SIZE which
       nobody uses anymore. It was great while it lasted, but now we're moving
       onto bigger and better things (Approved by: wollman).
  
     * Practically re-wrote the allocation macros in sys/sys/mbuf.h to accomodate
       new allocations which grab the necessary lock.
  
     * Make sure that necessary mbstat variables are manipulated with
       corresponding atomic() routines.
  
     * Changed the "wait" routines, cleaned it up, made one routine that does
       the job.
  
     * Generalized MWAKEUP() macro. Got rid of m_retry and m_retryhdr, as they
       are now included in the generalized "wait" routines.
  
     * Sleep routines now use msleep().
  
     * Free lists have locks.
  
     * etc... probably other stuff I'm missing...
  
    Things to look out for and work on later:
  
     * find a better way to (dynamically) adjust EXT_COUNTERS
  
     * move necessity to recurse on a lock from drain routines by providing
       lock-free lower-level version of MFREE() (and possibly m_free()?).
  
     * checkout include of mutex.h in sys/sys/mbuf.h - probably violating
       general philosophy here.
  
     The code has been reviewed quite a bit, but problems may arise... please,
     don't panic! Send me Emails: bmilekic@freebsd.org
  
  Reviewed by: jlemon, cp, alfred, others?
  
  Revision  Changes    Path
  1.95      +3 -14     src/sys/alpha/alpha/machdep.c
  1.412     +3 -14     src/sys/i386/i386/machdep.c
  1.57      +211 -258  src/sys/kern/uipc_mbuf.c
  1.180     +3 -14     src/sys/pc98/i386/machdep.c
  1.70      +3 -3      src/sys/sys/kernel.h
  1.56      +173 -152  src/sys/sys/mbuf.h



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