From owner-cvs-all  Sat Sep  8 13: 2:41 2001
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From: Matt Dillon <dillon@FreeBSD.org>
Date: Sat, 8 Sep 2001 13:02:33 -0700 (PDT)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/kern imgact_aout.c imgact_elf.c kern_sig.c
         vfs_vnops.c src/sys/compat/pecoff imgact_pecoff.c src/sys/sys
         vnode.h
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dillon      2001/09/08 13:02:33 PDT

  Modified files:
    sys/kern             imgact_aout.c imgact_elf.c kern_sig.c 
                         vfs_vnops.c 
    sys/compat/pecoff    imgact_pecoff.c 
    sys/sys              vnode.h 
  Log:
  This brings in a Yahoo coredump patch from Paul, with additional mods by
  me (addition of vn_rdwr_inchunks).  The problem Yahoo is solving is that
  if you have large process images core dumping, or you have a large number of
  forked processes all core dumping at the same time, the original coredump code
  would leave the vnode locked throughout.  This can cause the directory vnode
  to get locked up, which can cause the parent directory vnode to get locked
  up, and so on all the way to the root node, locking the entire machine up
  for extremely long periods of time.
  
  This patch solves the problem in two ways.  First it uses an advisory
  non-blocking lock to abort multiple processes trying to core to the same
  file.  Second (my contribution) it chunks up the writes and uses bwillwrite()
  to avoid holding the vnode locked while blocking in the buffer cache.
  
  Submitted by:	ps
  Reviewed by:	dillon
  MFC after:	2 weeks
  
  Revision  Changes    Path
  1.71      +5 -5      src/sys/kern/imgact_aout.c
  1.103     +6 -5      src/sys/kern/imgact_elf.c
  1.132     +20 -5     src/sys/kern/kern_sig.c
  1.119     +40 -1     src/sys/kern/vfs_vnops.c
  1.9       +5 -5      src/sys/compat/pecoff/imgact_pecoff.c
  1.155     +4 -1      src/sys/sys/vnode.h


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