cvs commit: src/sys/amd64/amd64 pmap.c

Peter Wemm peter at
Mon Jun 7 23:51:21 GMT 2004

peter       2004-06-07 23:51:20 UTC

  FreeBSD src repository

  Modified files:
    sys/amd64/amd64      pmap.c 
  Fix a serious problem that manifested during swap, and a few other times.
  pmap_remove() would be called with a huge range and we'd stride across
  it in only 2MB chunks.  This would manifest as massive cpu time and a
  largely unresponsive system during hard swap.  Instead, check the higher
  page directories which means we can run pmap_remove() in just a few
  hundred loop iterations instead of millions since we can process
  address space in chunks of 512GB and 1GB as well as 2MB.
  Eternal thanks to:  tmm
  Revision  Changes    Path
  1.462     +60 -18    src/sys/amd64/amd64/pmap.c

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