cvs commit: src/share/man/man9 Makefile sx.9 src/sys/conf NOTES options src/sys/dev/acpica acpi_ec.c src/sys/dev/mxge if_mxge.c src/sys/dev/usb if_aue.c if_axe.c src/sys/gnu/fs/xfs/FreeBSD/support mrlock.c mrlock.h ...

John Baldwin jhb at
Sat Mar 31 23:23:43 UTC 2007

jhb         2007-03-31 23:23:42 UTC

  FreeBSD src repository

  Modified files:
    share/man/man9       Makefile sx.9 
    sys/conf             NOTES options 
    sys/dev/acpica       acpi_ec.c 
    sys/dev/mxge         if_mxge.c 
    sys/dev/usb          if_aue.c if_axe.c 
    sys/gnu/fs/xfs/FreeBSD/support mrlock.c mrlock.h 
    sys/i386/acpica      acpi_machdep.c 
    sys/kern             kern_sx.c 
    sys/netinet6         in6_src.c 
    sys/sys              sleepqueue.h sx.h 
  Added files:
    sys/sys              _sx.h 
  Optimize sx locks to use simple atomic operations for the common cases of
  obtaining and releasing shared and exclusive locks.  The algorithms for
  manipulating the lock cookie are very similar to that rwlocks.  This patch
  also adds support for exclusive locks using the same algorithm as mutexes.
  A new sx_init_flags() function has been added so that optional flags can be
  specified to alter a given locks behavior.  The flags include SX_DUPOK,
  SX_NOWITNESS, SX_NOPROFILE, and SX_QUITE which are all identical in nature
  to the similar flags for mutexes.
  Adaptive spinning on select locks may be enabled by enabling the
  ADAPTIVE_SX kernel option.  Only locks initialized with the SX_ADAPTIVESPIN
  flag via sx_init_flags() will adaptively spin.
  The common cases for sx_slock(), sx_sunlock(), sx_xlock(), and sx_xunlock()
  are now performed inline in non-debug kernels.  As a result, <sys/sx.h> now
  requires <sys/lock.h> to be included prior to <sys/sx.h>.
  The new kernel option SX_NOINLINE can be used to disable the aforementioned
  inlining in non-debug kernels.
  The size of struct sx has changed, so the kernel ABI is probably greatly
  MFC after:      1 month
  Submitted by:   attilio
  Tested by:      kris, pjd
  Revision  Changes    Path
  1.305     +1 -0      src/share/man/man9/Makefile
  1.38      +58 -4     src/share/man/man9/sx.9
  1.1417    +13 -0     src/sys/conf/NOTES
  1.584     +2 -0      src/sys/conf/options
  1.73      +1 -0      src/sys/dev/acpica/acpi_ec.c
  1.25      +1 -0      src/sys/dev/mxge/if_mxge.c
  1.107     +1 -0      src/sys/dev/usb/if_aue.c
  1.42      +1 -0      src/sys/dev/usb/if_axe.c
  1.2       +8 -43     src/sys/gnu/fs/xfs/FreeBSD/support/mrlock.c
  1.2       +12 -36    src/sys/gnu/fs/xfs/FreeBSD/support/mrlock.h
  1.35      +1 -0      src/sys/i386/acpica/acpi_machdep.c
  1.40      +681 -229  src/sys/kern/kern_sx.c
  1.42      +1 -0      src/sys/netinet6/in6_src.c
  1.1       +43 -0     src/sys/sys/_sx.h (new)
  1.12      +4 -2      src/sys/sys/sleepqueue.h
  1.29      +168 -18   src/sys/sys/sx.h

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