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_MAX,	/* always last member of enum */
27 };
28 
29 /* Flags for set_mempolicy */
30 #define MPOL_F_STATIC_NODES	(1 << 15)
31 #define MPOL_F_RELATIVE_NODES	(1 << 14)
32 #define MPOL_F_NUMA_BALANCING	(1 << 13) /* Optimize with NUMA balancing if possible */
33 
34 /*
35  * MPOL_MODE_FLAGS is the union of all possible optional mode flags passed to
36  * either set_mempolicy() or mbind().
37  */
38 #define MPOL_MODE_FLAGS							\
39 	(MPOL_F_STATIC_NODES | MPOL_F_RELATIVE_NODES | MPOL_F_NUMA_BALANCING)
40 
41 /* Flags for get_mempolicy */
42 #define MPOL_F_NODE	(1<<0)	/* return next IL mode instead of node mask */
43 #define MPOL_F_ADDR	(1<<1)	/* look up vma using address */
44 #define MPOL_F_MEMS_ALLOWED (1<<2) /* return allowed memories */
45 
46 /* Flags for mbind */
47 #define MPOL_MF_STRICT	(1<<0)	/* Verify existing pages in the mapping */
48 #define MPOL_MF_MOVE	 (1<<1)	/* Move pages owned by this process to conform
49 				   to policy */
50 #define MPOL_MF_MOVE_ALL (1<<2)	/* Move every page to conform to policy */
51 #define MPOL_MF_LAZY	 (1<<3)	/* Modifies '_MOVE:  lazy migrate on fault */
52 #define MPOL_MF_INTERNAL (1<<4)	/* Internal flags start here */
53 
54 #define MPOL_MF_VALID	(MPOL_MF_STRICT   | 	\
55 			 MPOL_MF_MOVE     | 	\
56 			 MPOL_MF_MOVE_ALL)
57 
58 /*
59  * Internal flags that share the struct mempolicy flags word with
60  * "mode flags".  These flags are allocated from bit 0 up, as they
61  * are never OR'ed into the mode in mempolicy API arguments.
62  */
63 #define MPOL_F_SHARED  (1 << 0)	/* identify shared policies */
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 */
76