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From: John Baldwin <jhb@FreeBSD.org>
Date: Tue, 15 Aug 2006 18:29:02 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
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Cc: 
Subject: cvs commit: src/sys/kern kern_lock.c kern_sx.c subr_turnstile.c
 src/sys/sys lockmgr.h sx.h
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jhb         2006-08-15 18:29:02 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             kern_lock.c kern_sx.c subr_turnstile.c 
    sys/sys              lockmgr.h sx.h 
  Log:
  Add a new 'show sleepchain' ddb command similar to 'show lockchain' except
  that it operates on lockmgr and sx locks.  This can be useful for tracking
  down vnode deadlocks in VFS for example.  Note that this command is a bit
  more fragile than 'show lockchain' as we have to poke around at the
  wait channel of a thread to see if it points to either a struct lock or
  a condition variable inside of a struct sx.  If td_wchan points to
  something unmapped, then this command will terminate early due to a fault,
  but no harm will be done.
  
  Revision  Changes    Path
  1.99      +28 -0     src/sys/kern/kern_lock.c
  1.30      +54 -1     src/sys/kern/kern_sx.c
  1.163     +67 -0     src/sys/kern/subr_turnstile.c
  1.50      +3 -0      src/sys/sys/lockmgr.h
  1.25      +3 -0      src/sys/sys/sx.h