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From: Attilio Rao <attilio@FreeBSD.org>
Date: Fri, 29 May 2009 01:49:27 +0000 (UTC)
To: cvs-src-old@freebsd.org
X-FreeBSD-CVS-Branch: HEAD
Subject: cvs commit: src UPDATING src/share/man/man9 sx.9
 src/sys/cddl/compat/opensolaris/sys mutex.h rwlock.h src/sys/conf
 NOTES options src/sys/kern kern_sx.c src/sys/sys param.h sx.h
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attilio     2009-05-29 01:49:27 UTC

  FreeBSD src repository

  Modified files:
    .                    UPDATING 
    share/man/man9       sx.9 
    sys/cddl/compat/opensolaris/sys mutex.h rwlock.h 
    sys/conf             NOTES options 
    sys/kern             kern_sx.c 
    sys/sys              param.h sx.h 
  Log:
  SVN rev 193011 on 2009-05-29 01:49:27Z by attilio
  
  Reverse the logic for ADAPTIVE_SX option and enable it by default.
  Introduce for this operation the reverse NO_ADAPTIVE_SX option.
  The flag SX_ADAPTIVESPIN to be passed to sx_init_flags(9) gets suppressed
  and the new flag, offering the reversed logic, SX_NOADAPTIVE is added.
  
  Additively implements adaptive spininning for sx held in shared mode.
  The spinning limit can be handled through sysctls in order to be tuned
  while the code doesn't reach the release, after which time they should
  be dropped probabilly.
  
  This change has made been necessary by recent benchmarks where it does
  improve concurrency of workloads in presence of high contention
  (ie. ZFS).
  
  KPI breakage is documented by __FreeBSD_version bumping, manpage and
  UPDATING updates.
  
  Requested by:   jeff, kmacy
  Reviewed by:    jeff
  Tested by:      pho
  
  Revision  Changes    Path
  1.606     +8 -0      src/UPDATING
  1.44      +5 -5      src/share/man/man9/sx.9
  1.7       +2 -2      src/sys/cddl/compat/opensolaris/sys/mutex.h
  1.7       +2 -2      src/sys/cddl/compat/opensolaris/sys/rwlock.h
  1.1542    +5 -5      src/sys/conf/NOTES
  1.671     +1 -1      src/sys/conf/options
  1.65      +50 -21    src/sys/kern/kern_sx.c
  1.412     +1 -1      src/sys/sys/param.h
  1.41      +1 -1      src/sys/sys/sx.h