migrate_pages


SYNOPSIS
       #include <numaif.h>

       long migrate_pages(int pid, unsigned long maxnode,
                          const unsigned long *old_nodes,
                          const unsigned long *new_nodes);

       Link with -lnuma.

DESCRIPTION
       migrate_pages()  moves  all pages of the process pid that are in memory
       nodes old_nodes to the memory nodes in new_nodes.  Pages not located in
       any  node  in  old_nodes will not be migrated.  As far as possible, the
       kernel maintains the relative topology  relationship  inside  old_nodes
       during the migration to new_nodes.

       The old_nodes and new_nodes arguments are pointers to bit masks of node
       numbers, with up to maxnode bits in each mask.  These masks  are  main-
       tained  as  arrays of unsigned long integers (in the last long integer,
       the bits beyond those specified by maxnode are ignored).   The  maxnode
       argument  is  the maximum node number in the bit mask plus one (this is
       the same as in mbind(2), but different from select(2)).

       The pid argument is the ID of the process whose pages are to be  moved.
       To  move  pages  in  another  process,  the  caller  must be privileged
       (CAP_SYS_NICE) or the real or effective user ID of the calling  process
       must match the real or saved-set user ID of the target process.  If pid
       is 0, then migrate_pages() moves pages of the calling process.

       Pages shared with another process will only be moved if the  initiating
       process has the CAP_SYS_NICE privilege.

RETURN VALUE
       On  success migrate_pages() returns zero.  On error, it returns -1, and
       sets errno to indicate the error.

ERRORS
       EPERM  Insufficient privilege  (CAP_SYS_NICE)  to  move  pages  of  the
              process    specified   by   pid,   or   insufficient   privilege
              (CAP_SYS_NICE) to access the specified target nodes.

       ESRCH  No process matching pid could be found.

VERSIONS
       The migrate_pages() system call first  appeared  on  Linux  in  version
       2.6.16.

CONFORMING TO
       This system call is Linux-specific.

NOTES
       For information on library support, see numa(7).

       installing libnuma-devel or a similar package.

SEE ALSO
       get_mempolicy(2),  mbind(2),  set_mempolicy(2),  numa(3), numa_maps(5),
       cpuset(7), numa(7), migratepages(8), numa_stat(8);
       the kernel source file Documentation/vm/page_migration.

COLOPHON
       This page is part of release 3.35 of the Linux  man-pages  project.   A
       description  of  the project, and information about reporting bugs, can
       be found at http://man7.org/linux/man-pages/.



Linux                             2010-11-01                  MIGRATE_PAGES(2)
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