Section (2) migrate_pages
migrate_pages — move all pages in a process to another set of nodes
|unsigned long maxnode,|
|const unsigned long *old_nodes,|
|const unsigned long *new_nodes
migrate_pages() attempts to
move 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
will not be migrated. As far as possible, the kernel
maintains the relative topology relationship inside
old_nodes during the
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
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
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
Pages shared with another process will be moved only if
the initiating process has the
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
errno to indicate the error.
Part or all of the memory range specified by
maxnodepoints outside your accessible address space.
The value specified by
maxnodeexceeds a kernel-imposed limit. Or,
new_nodesspecifies one or more node IDs that are greater than the maximum supported node ID. Or, none of the node IDs specified by
new_nodesare on-line and allowed by the process_zsingle_quotesz_s current cpuset context, or none of the specified nodes contain memory.
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.
No process matching
pidcould be found.
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_zsingle_quotesz_s cpuset. Note that this information is subject to
change at any time by manual or automatic reconfiguration of
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
header is not included with glibc, but requires installing
libnuma-devel or a
Documentation/vm/page_migration.rst in the
Linux kernel source tree
This page is part of release 5.04 of the Linux
man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
Copyright 2009 Intel Corporation
Author: Andi Kleen
Based on the move_pages manpage which was
This manpage is Copyright (C) 2006 Silicon Graphics, Inc.
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.
Permission is granted to copy and distribute modified versions of this
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