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 /* Whether the nodemask is specified by users */ 43 #define MPOL_USER_NODEMASK_FLAGS (MPOL_F_STATIC_NODES | MPOL_F_RELATIVE_NODES) 44 45 /* Flags for get_mempolicy */ 46 #define MPOL_F_NODE (1<<0) /* return next IL mode instead of node mask */ 47 #define MPOL_F_ADDR (1<<1) /* look up vma using address */ 48 #define MPOL_F_MEMS_ALLOWED (1<<2) /* return allowed memories */ 49 50 /* Flags for mbind */ 51 #define MPOL_MF_STRICT (1<<0) /* Verify existing pages in the mapping */ 52 #define MPOL_MF_MOVE (1<<1) /* Move pages owned by this process to conform 53 to policy */ 54 #define MPOL_MF_MOVE_ALL (1<<2) /* Move every page to conform to policy */ 55 #define MPOL_MF_LAZY (1<<3) /* UNSUPPORTED FLAG: Lazy migrate on fault */ 56 #define MPOL_MF_INTERNAL (1<<4) /* Internal flags start here */ 57 58 #define MPOL_MF_VALID (MPOL_MF_STRICT | \ 59 MPOL_MF_MOVE | \ 60 MPOL_MF_MOVE_ALL) 61 62 /* 63 * Internal flags that share the struct mempolicy flags word with 64 * "mode flags". These flags are allocated from bit 0 up, as they 65 * are never OR'ed into the mode in mempolicy API arguments. 66 */ 67 #define MPOL_F_SHARED (1 << 0) /* identify shared policies */ 68 #define MPOL_F_MOF (1 << 3) /* this policy wants migrate on fault */ 69 #define MPOL_F_MORON (1 << 4) /* Migrate On protnone Reference On Node */ 70 71 /* 72 * Enabling zone reclaim means the page allocator will attempt to fulfill 73 * the allocation request on the current node by triggering reclaim and 74 * trying to shrink the current node. 75 * Fallback allocations on the next candidates in the zonelist are considered 76 * when reclaim fails to free up enough memory in the current node/zone. 77 * 78 * These bit locations are exposed in the vm.zone_reclaim_mode sysctl. 79 * New bits are OK, but existing bits should not be changed. 80 */ 81 #define RECLAIM_ZONE (1<<0) /* Enable zone reclaim */ 82 #define RECLAIM_WRITE (1<<1) /* Writeout pages during reclaim */ 83 #define RECLAIM_UNMAP (1<<2) /* Unmap pages during reclaim */ 84 85 #endif /* _UAPI_LINUX_MEMPOLICY_H */ 86