Section: Linux Programmer's Manual (2)
migrate_pages - move all pages in a process to another set of nodes
long migrate_pages(int pid, unsigned long maxnode,
const unsigned long *old_nodes,
const unsigned long *new_nodes);
Link with -lnuma.
attempts to move all pages of the process
that are in memory nodes
to the memory nodes in
Pages not located in any node in
will not be migrated.
As far as possible,
the kernel maintains the relative topology relationship inside
during the migration to
arguments are pointers to bit masks of node numbers, with up to
bits in each mask.
These masks are maintained as arrays of unsigned
integers (in the last
integer, the bits beyond those specified by
argument is the maximum node number in the bit mask plus one (this is the same
but different from
argument is the ID of the process whose pages are to be moved.
To move pages in another process,
the caller must be privileged
or the real or effective user ID of the calling process must match the
real or saved-set user ID of the target process.
is 0, then
moves pages of the calling process.
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
to indicate the error.
Part or all of the memory range specified by
points outside your accessible address space.
The value specified by
exceeds a kernel-imposed limit.
specifies one or more node IDs that are
greater than the maximum supported node ID.
Or, none of the node IDs specified by
are on-line and allowed by the process's current cpuset context,
or none of the specified nodes contain memory.
to move pages of the process specified by
or insufficient privilege
to access the specified target nodes.
No process matching
could be found.
system call first appeared on Linux in version 2.6.16.
This system call is Linux-specific.
For information on library support, see
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.
may result in pages whose location
(node) violates the memory policy established for the
specified addresses (see
and/or the specified process (see
That is, memory policy does not constrain the destination
nodes used by
header is not included with glibc, but requires installing
or a similar package.
in the Linux kernel source tree
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