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-.\" SPDX-License-Identifier: Linux-man-pages-copyleft-var
-.\"
-.\" Copyright 2003,2004 Andi Kleen, SuSE Labs.
-.\" and Copyright 2007 Lee Schermerhorn, Hewlett Packard
-.\"
-.\" 2006-02-03, mtk, substantial wording changes and other improvements
-.\" 2007-08-27, Lee Schermerhorn <Lee.Schermerhorn@hp.com>
-.\"     more precise specification of behavior.
-.\"
-.TH get_mempolicy 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-get_mempolicy \- retrieve NUMA memory policy for a thread
-.SH LIBRARY
-NUMA (Non-Uniform Memory Access) policy library
-.RI ( libnuma ", " \-lnuma )
-.SH SYNOPSIS
-.B "#include <numaif.h>"
-.nf
-.P
-.BI "long get_mempolicy(int *" mode ,
-.BI "                   unsigned long " nodemask [(. maxnode " + ULONG_WIDTH - 1)"
-.B "                                          / ULONG_WIDTH],"
-.BI "                   unsigned long " maxnode ", void *" addr ,
-.BI "                   unsigned long " flags );
-.fi
-.SH DESCRIPTION
-.BR get_mempolicy ()
-retrieves the NUMA policy of the calling thread or of a memory address,
-depending on the setting of
-.IR flags .
-.P
-A NUMA machine has different
-memory controllers with different distances to specific CPUs.
-The memory policy defines from which node memory is allocated for
-the thread.
-.P
-If
-.I flags
-is specified as 0,
-then information about the calling thread's default policy
-(as set by
-.BR set_mempolicy (2))
-is returned, in the buffers pointed to by
-.I mode
-and
-.IR nodemask .
-The value returned in these arguments
-may be used to restore the thread's policy to its state at
-the time of the call to
-.BR get_mempolicy ()
-using
-.BR set_mempolicy (2).
-When
-.I flags
-is 0,
-.I addr
-must be specified as NULL.
-.P
-If
-.I flags
-specifies
-.B MPOL_F_MEMS_ALLOWED
-(available since Linux 2.6.24), the
-.I mode
-argument is ignored and the set of nodes (memories) that the
-thread is allowed to specify in subsequent calls to
-.BR mbind (2)
-or
-.BR set_mempolicy (2)
-(in the absence of any
-.IR "mode flags" )
-is returned in
-.IR nodemask .
-It is not permitted to combine
-.B MPOL_F_MEMS_ALLOWED
-with either
-.B MPOL_F_ADDR
-or
-.BR MPOL_F_NODE .
-.P
-If
-.I flags
-specifies
-.BR MPOL_F_ADDR ,
-then information is returned about the policy governing the memory
-address given in
-.IR addr .
-This policy may be different from the thread's default policy if
-.BR mbind (2)
-or one of the helper functions described in
-.BR numa (3)
-has been used to establish a policy for the memory range containing
-.IR addr .
-.P
-If the
-.I mode
-argument is not NULL, then
-.BR get_mempolicy ()
-will store the policy mode and any optional
-.I "mode flags"
-of the requested NUMA policy in the location pointed to by this argument.
-If
-.I nodemask
-is not NULL, then the nodemask associated with the policy will be stored
-in the location pointed to by this argument.
-.I maxnode
-specifies the number of node IDs
-that can be stored into
-.IR nodemask \[em]that
-is, the maximum node ID plus one.
-The value specified by
-.I maxnode
-is always rounded to a multiple of
-.IR "sizeof(unsigned\ long)*8" .
-.P
-If
-.I flags
-specifies both
-.B MPOL_F_NODE
-and
-.BR MPOL_F_ADDR ,
-.BR get_mempolicy ()
-will return the node ID of the node on which the address
-.I addr
-is allocated into the location pointed to by
-.IR mode .
-If no page has yet been allocated for the specified address,
-.BR get_mempolicy ()
-will allocate a page as if the thread had performed a read
-(load) access to that address, and return the ID of the node
-where that page was allocated.
-.P
-If
-.I flags
-specifies
-.BR MPOL_F_NODE ,
-but not
-.BR MPOL_F_ADDR ,
-and the thread's current policy is
-.BR MPOL_INTERLEAVE ,
-then
-.BR get_mempolicy ()
-will return in the location pointed to by a non-NULL
-.I mode
-argument,
-the node ID of the next node that will be used for
-interleaving of internal kernel pages allocated on behalf of the thread.
-.\" Note:  code returns next interleave node via 'mode' argument -Lee Schermerhorn
-These allocations include pages for memory-mapped files in
-process memory ranges mapped using the
-.BR mmap (2)
-call with the
-.B MAP_PRIVATE
-flag for read accesses, and in memory ranges mapped with the
-.B MAP_SHARED
-flag for all accesses.
-.P
-Other flag values are reserved.
-.P
-For an overview of the possible policies see
-.BR set_mempolicy (2).
-.SH RETURN VALUE
-On success,
-.BR get_mempolicy ()
-returns 0;
-on error, \-1 is returned and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EFAULT
-Part of all of the memory range specified by
-.I nodemask
-and
-.I maxnode
-points outside your accessible address space.
-.TP
-.B EINVAL
-The value specified by
-.I maxnode
-is less than the number of node IDs supported by the system.
-Or
-.I flags
-specified values other than
-.B MPOL_F_NODE
-or
-.BR MPOL_F_ADDR ;
-or
-.I flags
-specified
-.B MPOL_F_ADDR
-and
-.I addr
-is NULL,
-or
-.I flags
-did not specify
-.B MPOL_F_ADDR
-and
-.I addr
-is not NULL.
-Or,
-.I flags
-specified
-.B MPOL_F_NODE
-but not
-.B MPOL_F_ADDR
-and the current thread policy is not
-.BR MPOL_INTERLEAVE .
-Or,
-.I flags
-specified
-.B MPOL_F_MEMS_ALLOWED
-with either
-.B MPOL_F_ADDR
-or
-.BR MPOL_F_NODE .
-(And there are other
-.B EINVAL
-cases.)
-.SH STANDARDS
-Linux.
-.SH HISTORY
-Linux 2.6.7.
-.SH NOTES
-For information on library support, see
-.BR numa (7).
-.SH SEE ALSO
-.BR getcpu (2),
-.BR mbind (2),
-.BR mmap (2),
-.BR set_mempolicy (2),
-.BR numa (3),
-.BR numa (7),
-.BR numactl (8)