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From: Alan Cox <alc@FreeBSD.org>
Date: Thu, 15 Jul 2010 16:25:51 +0000 (UTC)
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Subject: cvs commit: src/sys/amd64/amd64 pmap.c
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alc         2010-07-15 16:25:51 UTC

  FreeBSD src repository

  Modified files:
    sys/amd64/amd64      pmap.c 
  Log:
  SVN rev 210124 on 2010-07-15 16:25:51Z by alc
  
  Optimize pmap_remove()'s handling of PG_G mappings.  Specifically,
  instead of calling pmap_invalidate_page() for each PG_G mapping, call
  pmap_invalidate_range() for each range of PG_G mappings.  In addition,
  eliminate a redundant call to pmap_invalidate_page().  Both
  pmap_remove_pte() and pmap_remove_page() called pmap_invalidate_page()
  when the mapping had the PG_G attribute.  Now, only pmap_remove_page()
  calls pmap_invalidate_page().  Altogether, these changes eliminate 53%
  of the TLB shootdowns for a "buildworld" on a ZFS file system.  On
  FFS, the reduction is 3%.
  
  MFC after:      6 weeks
  
  Revision  Changes    Path
  1.709     +15 -14    src/sys/amd64/amd64/pmap.c