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           #include <numaif.h>
           long move_pages(int pid, unsigned long count, void **pages,
                           const int *nodes, int *status, int flags);
           Link with -lnuma.


           move_pages() moves the specified pages of the process pid to the memory
           nodes specified by nodes.  The result of the move is reflected in  sta-
           tus.  The flags indicate constraints on the pages to be moved.
           pid  is  the ID of the process in which 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
           move_pages() moves pages of the calling process.
           count is the number of pages to move.  It defines the size of the three
           arrays pages, nodes, and status.
           pages is an array of pointers to the pages that should be moved.  These
           are  pointers that should be aligned to page boundaries.  Addresses are
           specified as seen by the process specified by pid.
           nodes is an array of integers that specify  the  desired  location  for
           each page.  Each element in the array is a node number.  nodes can also
           be NULL, in which case move_pages() does not move any pages but instead
           will  return  the node where each page currently resides, in the status
           array.  Obtaining the status of each page may be necessary to determine
           pages that need to be moved.
           status  is  an  array  of integers that return the status of each page.
           The array contains valid values only if move_pages() did not return  an
           flags  specify  what  types  of pages to move.  MPOL_MF_MOVE means that
           only pages that are in exclusive use by the process are  to  be  moved.
           MPOL_MF_MOVE_ALL means that pages shared between multiple processes can
           also be moved.  The process must be privileged  (CAP_SYS_NICE)  to  use
       Page states in the status array
           The  following  values  can  be  returned in each element of the status
                  Identifies the node on which the page resides.
                  The page is mapped by multiple processes and can be  moved  only
                  A dirty page cannot be moved.  The filesystem does not provide a
                  migration function and has no ability to write back pages.
                  The page is not present.
                  Unable to allocate memory on target node.


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


           E2BIG  Too many pages to move.
           EACCES One of the target nodes is not allowed by the current cpuset.
           EFAULT Parameter array could not be accessed.
           EINVAL Flags other than MPOL_MF_MOVE and MPOL_MF_MOVE_ALL was specified
                  or an attempt was made to migrate pages of a kernel thread.
           ENODEV One of the target nodes is not online.
           ENOENT No pages were found that require moving.  All pages  are  either
                  already  on the target node, not present, had an invalid address
                  or could not be moved because they were mapped by multiple  pro-
           EPERM  The  caller specified MPOL_MF_MOVE_ALL without sufficient privi-
                  leges (CAP_SYS_NICE).  Or, the caller attempted to move pages of
                  a  process  belonging to another user but did not have privilege
                  to do so (CAP_SYS_NICE).
           ESRCH  Process does not exist.


           move_pages() first appeared on Linux in version 2.6.18.


           This system call is Linux-specific.


           For information on library support, see numa(7).
           Use get_mempolicy(2) with the MPOL_F_MEMS_ALLOWED flag  to  obtain  the
           set  of  nodes  that are allowed by the current cpuset.  Note that this
           information is subject to change at any time  by  manual  or  automatic
           reconfiguration of the cpuset.

    Linux 2010-06-11 MOVE_PAGES(2)


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