From owner-cvs-all  Tue Mar 13 22:48:57 2001
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From: Matt Dillon <dillon@FreeBSD.org>
Date: Tue, 13 Mar 2001 22:48:54 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/vm vm_fault.c vm_map.c vm_map.h
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dillon      2001/03/13 22:48:54 PST

  Modified files:
    sys/vm               vm_fault.c vm_map.c vm_map.h 
  Log:
  Fix a lock reversal problem in the VM subsystem related to threaded
  programs.   There is a case during a fork() which can cause a deadlock.
  
  From Tor -
  The workaround that consists of setting a flag in the vm map that
  indicates that a fork is in progress and using that mark in the page
  fault handling to force a revalidation failure.  That change will only
  affect (pessimize) page fault handling during fork for threaded
  (linuxthreads style) applications and applications using aio_*().
  
  Submited by: tegge
  
  Revision  Changes    Path
  1.117     +7 -1      src/sys/vm/vm_fault.c
  1.197     +4 -1      src/sys/vm/vm_map.c
  1.58      +2 -1      src/sys/vm/vm_map.h


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