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1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2/*
3 * NUMA memory policies for Linux.
4 * Copyright 2003,2004 Andi Kleen SuSE Labs
5 */
6#ifndef _UAPI_LINUX_MEMPOLICY_H
7#define _UAPI_LINUX_MEMPOLICY_H
8
9#include <linux/errno.h>
10
11
12/*
13 * Both the MPOL_* mempolicy mode and the MPOL_F_* optional mode flags are
14 * passed by the user to either set_mempolicy() or mbind() in an 'int' actual.
15 * The MPOL_MODE_FLAGS macro determines the legal set of optional mode flags.
16 */
17
18/* Policies */
19enum {
20 MPOL_DEFAULT,
21 MPOL_PREFERRED,
22 MPOL_BIND,
23 MPOL_INTERLEAVE,
24 MPOL_LOCAL,
25 MPOL_MAX, /* always last member of enum */
26};
27
28/* Flags for set_mempolicy */
29#define MPOL_F_STATIC_NODES (1 << 15)
30#define MPOL_F_RELATIVE_NODES (1 << 14)
31#define MPOL_F_NUMA_BALANCING (1 << 13) /* Optimize with NUMA balancing if possible */
32
33/*
34 * MPOL_MODE_FLAGS is the union of all possible optional mode flags passed to
35 * either set_mempolicy() or mbind().
36 */
37#define MPOL_MODE_FLAGS \
38 (MPOL_F_STATIC_NODES | MPOL_F_RELATIVE_NODES | MPOL_F_NUMA_BALANCING)
39
40/* Flags for get_mempolicy */
41#define MPOL_F_NODE (1<<0) /* return next IL mode instead of node mask */
42#define MPOL_F_ADDR (1<<1) /* look up vma using address */
43#define MPOL_F_MEMS_ALLOWED (1<<2) /* return allowed memories */
44
45/* Flags for mbind */
46#define MPOL_MF_STRICT (1<<0) /* Verify existing pages in the mapping */
47#define MPOL_MF_MOVE (1<<1) /* Move pages owned by this process to conform
48 to policy */
49#define MPOL_MF_MOVE_ALL (1<<2) /* Move every page to conform to policy */
50#define MPOL_MF_LAZY (1<<3) /* Modifies '_MOVE: lazy migrate on fault */
51#define MPOL_MF_INTERNAL (1<<4) /* Internal flags start here */
52
53#define MPOL_MF_VALID (MPOL_MF_STRICT | \
54 MPOL_MF_MOVE | \
55 MPOL_MF_MOVE_ALL)
56
57/*
58 * Internal flags that share the struct mempolicy flags word with
59 * "mode flags". These flags are allocated from bit 0 up, as they
60 * are never OR'ed into the mode in mempolicy API arguments.
61 */
62#define MPOL_F_SHARED (1 << 0) /* identify shared policies */
63#define MPOL_F_LOCAL (1 << 1) /* preferred local allocation */
64#define MPOL_F_MOF (1 << 3) /* this policy wants migrate on fault */
65#define MPOL_F_MORON (1 << 4) /* Migrate On protnone Reference On Node */
66
67/*
68 * These bit locations are exposed in the vm.zone_reclaim_mode sysctl
69 * ABI. New bits are OK, but existing bits can never change.
70 */
71#define RECLAIM_ZONE (1<<0) /* Run shrink_inactive_list on the zone */
72#define RECLAIM_WRITE (1<<1) /* Writeout pages during reclaim */
73#define RECLAIM_UNMAP (1<<2) /* Unmap pages during reclaim */
74
75#endif /* _UAPI_LINUX_MEMPOLICY_H */