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 */
19 enum {
20 MPOL_DEFAULT,
21 MPOL_PREFERRED,
22 MPOL_BIND,
23 MPOL_INTERLEAVE,
24 MPOL_LOCAL,
25 MPOL_PREFERRED_MANY,
26 MPOL_WEIGHTED_INTERLEAVE,
27 MPOL_MAX, /* always last member of enum */
28 };
29
30 /* Flags for set_mempolicy */
31 #define MPOL_F_STATIC_NODES (1 << 15)
32 #define MPOL_F_RELATIVE_NODES (1 << 14)
33 #define MPOL_F_NUMA_BALANCING (1 << 13) /* Optimize with NUMA balancing if possible */
34
35 /*
36 * MPOL_MODE_FLAGS is the union of all possible optional mode flags passed to
37 * either set_mempolicy() or mbind().
38 */
39 #define MPOL_MODE_FLAGS \
40 (MPOL_F_STATIC_NODES | MPOL_F_RELATIVE_NODES | MPOL_F_NUMA_BALANCING)
41
42 /* Flags for get_mempolicy */
43 #define MPOL_F_NODE (1<<0) /* return next IL mode instead of node mask */
44 #define MPOL_F_ADDR (1<<1) /* look up vma using address */
45 #define MPOL_F_MEMS_ALLOWED (1<<2) /* return allowed memories */
46
47 /* Flags for mbind */
48 #define MPOL_MF_STRICT (1<<0) /* Verify existing pages in the mapping */
49 #define MPOL_MF_MOVE (1<<1) /* Move pages owned by this process to conform
50 to policy */
51 #define MPOL_MF_MOVE_ALL (1<<2) /* Move every page to conform to policy */
52 #define MPOL_MF_LAZY (1<<3) /* UNSUPPORTED FLAG: Lazy migrate on fault */
53 #define MPOL_MF_INTERNAL (1<<4) /* Internal flags start here */
54
55 #define MPOL_MF_VALID (MPOL_MF_STRICT | \
56 MPOL_MF_MOVE | \
57 MPOL_MF_MOVE_ALL)
58
59 /*
60 * Internal flags that share the struct mempolicy flags word with
61 * "mode flags". These flags are allocated from bit 0 up, as they
62 * are never OR'ed into the mode in mempolicy API arguments.
63 */
64 #define MPOL_F_SHARED (1 << 0) /* identify shared policies */
65 #define MPOL_F_MOF (1 << 3) /* this policy wants migrate on fault */
66 #define MPOL_F_MORON (1 << 4) /* Migrate On protnone Reference On Node */
67
68 /*
69 * These bit locations are exposed in the vm.zone_reclaim_mode sysctl
70 * ABI. New bits are OK, but existing bits can never change.
71 */
72 #define RECLAIM_ZONE (1<<0) /* Run shrink_inactive_list on the zone */
73 #define RECLAIM_WRITE (1<<1) /* Writeout pages during reclaim */
74 #define RECLAIM_UNMAP (1<<2) /* Unmap pages during reclaim */
75
76 #endif /* _UAPI_LINUX_MEMPOLICY_H */
77
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