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_ALWAYS,
26 SHMEM_WITHIN_SIZE,
27 SHMEM_ADVISE,
28 SHMEM_NEVER,
29 SHMEM_DENY,
30 SHMEM_FORCE,
31 };
32
33 #define NR_ORDERS 20
34
35 struct hugepages_settings {
36 enum thp_enabled enabled;
37 };
38
39 struct khugepaged_settings {
40 bool defrag;
41 unsigned int alloc_sleep_millisecs;
42 unsigned int scan_sleep_millisecs;
43 unsigned int max_ptes_none;
44 unsigned int max_ptes_swap;
45 unsigned int max_ptes_shared;
46 unsigned long pages_to_scan;
47 };
48
49 struct thp_settings {
50 enum thp_enabled thp_enabled;
51 enum thp_defrag thp_defrag;
52 enum shmem_enabled shmem_enabled;
53 bool use_zero_page;
54 struct khugepaged_settings khugepaged;
55 unsigned long read_ahead_kb;
56 struct hugepages_settings hugepages[NR_ORDERS];
57 };
58
59 int read_file(const char *path, char *buf, size_t buflen);
60 int write_file(const char *path, const char *buf, size_t buflen);
61 const unsigned long read_num(const char *path);
62 void write_num(const char *path, unsigned long num);
63
64 int thp_read_string(const char *name, const char * const strings[]);
65 void thp_write_string(const char *name, const char *val);
66 const unsigned long thp_read_num(const char *name);
67 void thp_write_num(const char *name, unsigned long num);
68
69 void thp_write_settings(struct thp_settings *settings);
70 void thp_read_settings(struct thp_settings *settings);
71 struct thp_settings *thp_current_settings(void);
72 void thp_push_settings(struct thp_settings *settings);
73 void thp_pop_settings(void);
74 void thp_restore_settings(void);
75 void thp_save_settings(void);
76
77 void thp_set_read_ahead_path(char *path);
78 unsigned long thp_supported_orders(void);
79
80 #endif /* __THP_SETTINGS_H__ */
81
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