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-.\" SPDX-License-Identifier: Linux-man-pages-copyleft-2-para
-.\"
-.\" Copyright 2009 Intel Corporation
-.\"                Author: Andi Kleen
-.\" Based on the move_pages manpage which was
-.\" This manpage is Copyright (C) 2006 Silicon Graphics, Inc.
-.\"                               Christoph Lameter
-.\"
-.TH migrate_pages 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-migrate_pages \- move all pages in a process to another set of nodes
-.SH LIBRARY
-NUMA (Non-Uniform Memory Access) policy library
-.RI ( libnuma ", " \-lnuma )
-.SH SYNOPSIS
-.nf
-.B #include <numaif.h>
-.P
-.BI "long migrate_pages(int " pid ", unsigned long " maxnode,
-.BI "                   const unsigned long *" old_nodes,
-.BI "                   const unsigned long *" new_nodes );
-.fi
-.SH DESCRIPTION
-.BR migrate_pages ()
-attempts to move all pages of the process
-.I pid
-that are in memory nodes
-.I old_nodes
-to the memory nodes in
-.IR new_nodes .
-Pages not located in any node in
-.I old_nodes
-will not be migrated.
-As far as possible,
-the kernel maintains the relative topology relationship inside
-.I old_nodes
-during the migration to
-.IR new_nodes .
-.P
-The
-.I old_nodes
-and
-.I new_nodes
-arguments are pointers to bit masks of node numbers, with up to
-.I maxnode
-bits in each mask.
-These masks are maintained as arrays of unsigned
-.I long
-integers (in the last
-.I long
-integer, the bits beyond those specified by
-.I maxnode
-are ignored).
-The
-.I maxnode
-argument is the maximum node number in the bit mask plus one (this is the same
-as in
-.BR mbind (2),
-but different from
-.BR select (2)).
-.P
-The
-.I 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
-.RB ( 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
-.I pid
-is 0, then
-.BR migrate_pages ()
-moves pages of the calling process.
-.P
-Pages shared with another process will be moved only if the initiating
-process has the
-.B CAP_SYS_NICE
-privilege.
-.SH RETURN VALUE
-On success
-.BR migrate_pages ()
-returns the number of pages that could not be moved
-(i.e., a return of zero means that all pages were successfully moved).
-On error, it returns \-1, and sets
-.I errno
-to indicate the error.
-.SH ERRORS
-.TP
-.B EFAULT
-Part or all of the memory range specified by
-.IR old_nodes / new_nodes
-and
-.I maxnode
-points outside your accessible address space.
-.TP
-.B EINVAL
-The value specified by
-.I maxnode
-exceeds a kernel-imposed limit.
-.\" As at 3.5, this limit is "a page worth of bits", e.g.,
-.\" 8 * 4096 bits, assuming a 4kB page size.
-Or,
-.I old_nodes
-or
-.I new_nodes
-specifies one or more node IDs that are
-greater than the maximum supported node ID.
-Or, none of the node IDs specified by
-.I new_nodes
-are on-line and allowed by the process's current cpuset context,
-or none of the specified nodes contain memory.
-.TP
-.B EPERM
-Insufficient privilege
-.RB ( CAP_SYS_NICE )
-to move pages of the process specified by
-.IR pid ,
-or insufficient privilege
-.RB ( CAP_SYS_NICE )
-to access the specified target nodes.
-.TP
-.B ESRCH
-No process matching
-.I pid
-could be found.
-.\" FIXME Document the other errors that can occur for migrate_pages()
-.SH STANDARDS
-Linux.
-.SH HISTORY
-Linux 2.6.16.
-.SH NOTES
-For information on library support, see
-.BR numa (7).
-.P
-Use
-.BR get_mempolicy (2)
-with the
-.B 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.
-.P
-Use of
-.BR migrate_pages ()
-may result in pages whose location
-(node) violates the memory policy established for the
-specified addresses (see
-.BR mbind (2))
-and/or the specified process (see
-.BR set_mempolicy (2)).
-That is, memory policy does not constrain the destination
-nodes used by
-.BR migrate_pages ().
-.P
-The
-.I <numaif.h>
-header is not included with glibc, but requires installing
-.I libnuma\-devel
-or a similar package.
-.SH SEE ALSO
-.BR get_mempolicy (2),
-.BR mbind (2),
-.BR set_mempolicy (2),
-.BR numa (3),
-.BR numa_maps (5),
-.BR cpuset (7),
-.BR numa (7),
-.BR migratepages (8),
-.BR numastat (8)
-.P
-.I Documentation/vm/page_migration.rst
-in the Linux kernel source tree