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From: Colin Percival <cperciva@FreeBSD.org>
Date: Tue, 4 Jan 2011 15:55:15 +0000 (UTC)
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Subject: cvs commit: src/sys/i386/xen pmap.c
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cperciva    2011-01-04 15:55:15 UTC

  FreeBSD src repository

  Modified files:
    sys/i386/xen         pmap.c 
  Log:
  SVN rev 216960 on 2011-01-04 15:55:15Z by cperciva
  
  Add hamfisted locking to the Xen/PV pmap code: Only allow one thread to
  be in {pmap_pinit, pmap_copy, pmap_release} at a time.
  
  This reduces the rate of panics when running 'make index' from ~0.6/hour
  to ~0.02/hour (p < 10^-30).
  
  At a later date this locking will be removed, and for this reason, it is
  wrapped in #ifdef HAMFISTED_LOCKING; this temporary hack is being put in
  place with the intention of shipping somewhat-stable Xen bits in FreeBSD
  8.2-RELEASE.
  
  PR:             kern/153672
  MFC after:      3 days
  
  Revision  Changes    Path
  1.58      +35 -0     src/sys/i386/xen/pmap.c