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migratepages(8)


NAME

   migratepages - Migrate the physical location a processes pages

SYNOPSIS

   migratepages pid from-nodes to-nodes

DESCRIPTION

   migratepages  moves  the physical location of a processes pages without
   any changes of the virtual address space of  the  process.  Moving  the
   pages  allows  one  to change the distances of a process to its memory.
   Performance may be optimized by moving a processes pages  to  the  node
   where it is executing.

   If  multiple  nodes  are  specified  for from-nodes or to-nodes then an
   attempt is made to preserve the relative location of each page in  each
   nodeset.

   For  example  if we move from nodes 2-5 to 7,9,12-13 then the preferred
   mode of operation is to move pages from 2->7, 3->9,  4->12  and  5->13.
   However, this is only posssible if enough memory is available.

   Valid node specifiers

          all                 All nodes
          number              Node number
          number1{,number2}   Node number1 and Node number2
          number1-number2     Nodes from number1 to number2
          ! nodes             Invert selection of the following specification.

NOTES

   Requires  an  NUMA  policy aware kernel with support for page migration
   (linux 2.6.16 and later).

   migratepages will only move  pages  that  are  not  shared  with  other
   processes  if  called by a user without administrative priviledges (but
   with the right to modify the process).

   migratepages will move all pages if invoked from root (or a  user  with
   administrative priviledges).

FILES

   /proc/<pid>/numa_maps  for  information  about the NUMA memory use of a
   process.

COPYRIGHT

   Copyright  2005-2006  Christoph   Lameter,   Silicon   Graphics,   Inc.
   migratepages is under the GNU General Public License, v.2

SEE ALSO

   numactl(8)   ,   set_mempolicy(2)   ,  get_mempolicy(2)  ,  mbind(2)  ,
   sched_setaffinity(2) ,  sched_getaffinity(2)  ,  proc(5)  ,  ftok(3)  ,
   shmat(2) , taskset(1)



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