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From: Colin Percival <cperciva@FreeBSD.org>
Date: Tue, 4 Jan 2011 00:16:38 +0000 (UTC)
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Subject: cvs commit: src/sys/i386/xen xen_machdep.c
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cperciva    2011-01-04 00:16:38 UTC

  FreeBSD src repository

  Modified files:
    sys/i386/xen         xen_machdep.c 
  Log:
  SVN rev 216944 on 2011-01-04 00:16:38Z by cperciva
  
  Adjust the critical section protecting _xen_flush_queue to cover the
  entire range where the page mapping request queue needs to be atomically
  examined and modified.
  
  Oddly, while this doesn't seem to affect the overall rate of panics
  (running 'make index' on EC2 t1.micro instances, there are 0.6 +/- 0.1
  panics per hour, both before and after this change), it eliminates
  vm_fault from panic backtraces, leaving only backtraces going through
  vmspace_fork.
  
  Revision  Changes    Path
  1.27      +11 -4     src/sys/i386/xen/xen_machdep.c