MIGRATEPAGES(8)		 Linux Administrator's Manual	       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  pro-
       cesses 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)




SGI				   Jan 2005		       MIGRATEPAGES(8)