1MIGRATEPAGES(8)          Linux Administrator's Manual          MIGRATEPAGES(8)
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NAME

6       migratepages - Migrate the physical location a processes pages
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SYNOPSIS

9       migratepages pid from-nodes to-nodes
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DESCRIPTION

12       migratepages  moves  the physical location of a processes pages without
13       any changes of the virtual address space of  the  process.  Moving  the
14       pages  allows  one  to change the distances of a process to its memory.
15       Performance may be optimized by moving a processes pages  to  the  node
16       where it is executing.
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18       If  multiple nodes are specified for from-nodes or to-nodes then an at‐
19       tempt is made to preserve the relative location of each  page  in  each
20       nodeset.
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22       For  example  if we move from nodes 2-5 to 7,9,12-13 then the preferred
23       mode of operation is to move pages from 2->7, 3->9,  4->12  and  5->13.
24       However, this is only posssible if enough memory is available.
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26       Valid node specifiers
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28              all                 All nodes
29              number              Node number
30              number1{,number2}   Node number1 and Node number2
31              number1-number2     Nodes from number1 to number2
32              ! nodes             Invert selection of the following specification.
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NOTES

35       Requires  a  NUMA  policy  aware kernel with support for page migration
36       (linux 2.6.16 and later).
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38       migratepages will only move pages that are not shared with  other  pro‐
39       cesses if called by a user without administrative priviledges (but with
40       the right to modify the process).
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42       migratepages will move all pages if invoked from root (or a  user  with
43       administrative priviledges).
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FILES

47       /proc/<pid>/numa_maps  for  information  about the NUMA memory use of a
48       process.
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51       Copyright 2005-2006 Christoph  Lameter,  Silicon  Graphics,  Inc.   mi‐
52       gratepages is under the GNU General Public License, v.2
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SEE ALSO

56       numactl(8)   ,   set_mempolicy(2)   ,  get_mempolicy(2)  ,  mbind(2)  ,
57       sched_setaffinity(2) ,  sched_getaffinity(2)  ,  proc(5)  ,  ftok(3)  ,
58       shmat(2) , taskset(1)
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63SGI                                Jan 2005                    MIGRATEPAGES(8)
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