bionic (8) migratepages.8.gz

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)