cvs commit: src/sys/kern kern_switch.c sched_4bsd.c sched_core.c sched_ule.c src/sys/sys mutex.h proc.h sched.h

[Jeff Roberson]

jeff        2007-06-04 23:50:31 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             sched_4bsd.c sched_core.c sched_ule.c 
                         kern_switch.c 
    sys/sys              mutex.h proc.h sched.h 
  Log:
  Commit 1/14 of sched_lock decomposition.
   - Move all scheduler locking into the schedulers utilizing a technique
     similar to solaris's container locking.
   - A per-process spinlock is now used to protect the queue of threads,
     thread count, suspension count, p_sflags, and other process
     related scheduling fields.
   - The new thread lock is actually a pointer to a spinlock for the
     container that the thread is currently owned by.  The container may
     be a turnstile, sleepqueue, or run queue.
   - thread_lock() is now used to protect access to thread related scheduling
     fields.  thread_unlock() unlocks the lock and thread_set_lock()
     implements the transition from one lock to another.
   - A new "blocked_lock" is used in cases where it is not safe to hold the
     actual thread's lock yet we must prevent access to the thread.
   - sched_throw() and sched_fork_exit() are introduced to allow the
     schedulers to fix-up locking at these points.
   - Add some minor infrastructure for optionally exporting scheduler
     statistics that were invaluable in solving performance problems with
     this patch.  Generally these statistics allow you to differentiate
     between different causes of context switches.
  
  Tested by:      kris, current@
  Tested on:      i386, amd64, ULE, 4BSD, libthr, libkse, PREEMPTION, etc.
  Discussed with: kris, attilio, kmacy, jhb, julian, bde (small parts each)
  
  Revision  Changes    Path
  1.130     +71 -21    src/sys/kern/kern_switch.c
  1.98      +115 -45   src/sys/kern/sched_4bsd.c
  1.14      +57 -2     src/sys/kern/sched_core.c
  1.193     +136 -39   src/sys/kern/sched_ule.c
  1.96      +9 -0      src/sys/sys/mutex.h
  1.479     +57 -56    src/sys/sys/proc.h
  1.32      +15 -1     src/sys/sys/sched.h