tools/testing/selftests/mm/thp_settings.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __THP_SETTINGS_H__
   3 #define __THP_SETTINGS_H__
   4
   5 #include <stdbool.h>
   6 #include <stddef.h>
   7 #include <stdint.h>
   8
   9 enum thp_enabled {
  10         THP_NEVER,
  11         THP_ALWAYS,
  12         THP_INHERIT,
  13         THP_MADVISE,
  14 };
  15
  16 enum thp_defrag {
  17         THP_DEFRAG_ALWAYS,
  18         THP_DEFRAG_DEFER,
  19         THP_DEFRAG_DEFER_MADVISE,
  20         THP_DEFRAG_MADVISE,
  21         THP_DEFRAG_NEVER,
  22 };
  23
  24 enum shmem_enabled {
  25         SHMEM_NEVER,
  26         SHMEM_ALWAYS,
  27         SHMEM_WITHIN_SIZE,
  28         SHMEM_ADVISE,
  29         SHMEM_INHERIT,
  30         SHMEM_DENY,
  31         SHMEM_FORCE,
  32 };
  33
  34 #define NR_ORDERS 20
  35
  36 struct hugepages_settings {
  37         enum thp_enabled enabled;
  38 };
  39
  40 struct khugepaged_settings {
  41         bool defrag;
  42         unsigned int alloc_sleep_millisecs;
  43         unsigned int scan_sleep_millisecs;
  44         unsigned int max_ptes_none;
  45         unsigned int max_ptes_swap;
  46         unsigned int max_ptes_shared;
  47         unsigned long pages_to_scan;
  48 };
  49
  50 struct shmem_hugepages_settings {
  51         enum shmem_enabled enabled;
  52 };
  53
  54 struct thp_settings {
  55         enum thp_enabled thp_enabled;
  56         enum thp_defrag thp_defrag;
  57         enum shmem_enabled shmem_enabled;
  58         bool use_zero_page;
  59         struct khugepaged_settings khugepaged;
  60         unsigned long read_ahead_kb;
  61         struct hugepages_settings hugepages[NR_ORDERS];
  62         struct shmem_hugepages_settings shmem_hugepages[NR_ORDERS];
  63 };
  64
  65 int read_file(const char *path, char *buf, size_t buflen);
  66 int write_file(const char *path, const char *buf, size_t buflen);
  67 const unsigned long read_num(const char *path);
  68 void write_num(const char *path, unsigned long num);
  69
  70 int thp_read_string(const char *name, const char * const strings[]);
  71 void thp_write_string(const char *name, const char *val);
  72 const unsigned long thp_read_num(const char *name);
  73 void thp_write_num(const char *name, unsigned long num);
  74
  75 void thp_write_settings(struct thp_settings *settings);
  76 void thp_read_settings(struct thp_settings *settings);
  77 struct thp_settings *thp_current_settings(void);
  78 void thp_push_settings(struct thp_settings *settings);
  79 void thp_pop_settings(void);
  80 void thp_restore_settings(void);
  81 void thp_save_settings(void);
  82
  83 void thp_set_read_ahead_path(char *path);
  84 unsigned long thp_supported_orders(void);
  85 unsigned long thp_shmem_supported_orders(void);
  86
  87 #endif /* __THP_SETTINGS_H__ */