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MIGRATE_PAGES(2) Linux Programmer's Manual MIGRATE_PAGES(2)
migrate_pages - move all pages in a process to another set of nodes
#include <numaif.h>
long migrate_pages(int pid, unsigned long maxnode,
const unsigned long *old_nodes,
const unsigned long *new_nodes);
Link with -lnuma.
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 maintained 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.
On success migrate_pages() returns zero. On error, it returns -1, and sets
errno to indicate the error.
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.
The migrate_pages() system call first appeared on Linux in version 2.6.16.
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 calling process's cpuset. Note that this
information is subject to change at any time by manual or automatic
reconfiguration of the cpuset.
Use of migrate_pages() may result in pages whose location (node) violates the
memory policy established for the specified addresses (see mbind(2)) and/or
the specified process (see set_mempolicy(2)). That is, memory policy does not
constrain the destination nodes used by migrate_pages().
The <numaif.h> header is not included with glibc, but requires installing
libnuma-devel or a similar package.
get_mempolicy(2), mbind(2), set_mempolicy(2), numa(3), numa_maps(5),
numa_stat(8);
the kernel source file Documentation/vm/page_migration.
This page is part of release 3.32 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
Linux 2010-11-01 MIGRATE_PAGES(2)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface