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 a 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)