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From: John Baldwin <jhb@FreeBSD.org>
Date: Wed, 5 Jan 2005 21:13:27 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
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X-FreeBSD-CVS-Branch: HEAD
Subject: cvs commit: src/sys/kern kern_mutex.c src/sys/sys mutex.h
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jhb         2005-01-05 21:13:27 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             kern_mutex.c 
    sys/sys              mutex.h 
  Log:
  Rework the optimization for spinlocks on UP to be slightly less drastic and
  turn it back on.  Specifically, the actual changes are now less intrusive
  in that the _get_spin_lock() and _rel_spin_lock() macros now have their
  contents changed for UP vs SMP kernels which centralizes the changes.
  Also, UP kernels do not use _mtx_lock_spin() and no longer include it.  The
  UP versions of the spin lock functions do not use any atomic operations,
  but simple compares and stores which allow mtx_owned() to still work for
  spin locks while removing the overhead of atomic operations.
  
  Tested on:      i386, alpha
  
  Revision  Changes    Path
  1.152     +2 -8      src/sys/kern/kern_mutex.c
  1.74      +26 -5     src/sys/sys/mutex.h