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From: Alan Cox <alc@FreeBSD.org>
Date: Mon, 6 Jul 2009 18:43:42 +0000 (UTC)
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Subject: cvs commit: src/sys/amd64/amd64 pmap.c
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alc         2009-07-06 18:43:42 UTC

  FreeBSD src repository

  Modified files:
    sys/amd64/amd64      pmap.c 
  Log:
  SVN rev 195416 on 2009-07-06 18:43:42Z by alc
  
  When pmap_change_attr() changes the PAT setting on a kernel mapping, it has
  to simultaneously change the PAT setting for the same pages within the
  direct map region.  This may require the demotion of a 2MB page mapping and
  the allocation of a page table page.  This revision gives the highest
  possible priority (VM_ALLOC_INTERRUPT) to this page allocation, so that
  pmap_change_attr() is less likely to fail.  (In general, kernel page table
  page allocations have the highest priority, so this is not creating a new
  precedent.)
  
  (Demotion of 1GB page mappings within the direct map already specifies
  VM_ALLOC_INTERRUPT to vm_page_alloc(), so only pmap_demote_pde() must be
  changed.)
  
  Approved by:    re (kib)
  
  Revision  Changes    Path
  1.662     +11 -3     src/sys/amd64/amd64/pmap.c