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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __THP_SETTINGS_H__
#define __THP_SETTINGS_H__
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
enum thp_enabled {
THP_NEVER,
THP_ALWAYS,
THP_INHERIT,
THP_MADVISE,
};
enum thp_defrag {
THP_DEFRAG_ALWAYS,
THP_DEFRAG_DEFER,
THP_DEFRAG_DEFER_MADVISE,
THP_DEFRAG_MADVISE,
THP_DEFRAG_NEVER,
};
enum shmem_enabled {
SHMEM_ALWAYS,
SHMEM_WITHIN_SIZE,
SHMEM_ADVISE,
SHMEM_NEVER,
SHMEM_DENY,
SHMEM_FORCE,
};
#define NR_ORDERS 20
struct hugepages_settings {
enum thp_enabled enabled;
};
struct khugepaged_settings {
bool defrag;
unsigned int alloc_sleep_millisecs;
unsigned int scan_sleep_millisecs;
unsigned int max_ptes_none;
unsigned int max_ptes_swap;
unsigned int max_ptes_shared;
unsigned long pages_to_scan;
};
struct thp_settings {
enum thp_enabled thp_enabled;
enum thp_defrag thp_defrag;
enum shmem_enabled shmem_enabled;
bool use_zero_page;
struct khugepaged_settings khugepaged;
unsigned long read_ahead_kb;
struct hugepages_settings hugepages[NR_ORDERS];
};
int read_file(const char *path, char *buf, size_t buflen);
int write_file(const char *path, const char *buf, size_t buflen);
const unsigned long read_num(const char *path);
void write_num(const char *path, unsigned long num);
int thp_read_string(const char *name, const char * const strings[]);
void thp_write_string(const char *name, const char *val);
const unsigned long thp_read_num(const char *name);
void thp_write_num(const char *name, unsigned long num);
void thp_write_settings(struct thp_settings *settings);
void thp_read_settings(struct thp_settings *settings);
struct thp_settings *thp_current_settings(void);
void thp_push_settings(struct thp_settings *settings);
void thp_pop_settings(void);
void thp_restore_settings(void);
void thp_save_settings(void);
void thp_set_read_ahead_path(char *path);
unsigned long thp_supported_orders(void);
#endif /* __THP_SETTINGS_H__ */
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