include/uapi/linux/mempolicy.h

   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 */