1 // SPDX-License-Identifier: GPL-2.0
52 	if (fd == -1)  in read_file()
55 	numread = read(fd, buf, buflen - 1);  in read_file()
73 	if (fd == -1) {  in write_file()
79 	numwritten = write(fd, buf, buflen - 1);  in write_file()
102 void write_num(const char *path, unsigned long num)  in write_num()  argument
106 	sprintf(buf, "%ld", num);  in write_num()
113 int thp_read_string(const char *name, const char * const strings[])  in thp_read_string()  argument
138 	memmove(buf, c, sizeof(buf) - (c - buf));  in thp_read_string()
148 	while (strings[ret]) {  in thp_read_string()
149 		if (!strcmp(strings[ret], buf))  in thp_read_string()
188 void thp_write_num(const char *name, unsigned long num)  in thp_write_num()  argument
198 	write_num(path, num);  in thp_write_num()
215 	settings->khugepaged = (struct khugepaged_settings) {  in thp_read_settings()
227 		settings->read_ahead_kb = read_num(dev_queue_read_ahead_path);  in thp_read_settings()
231 			settings->hugepages[i].enabled = THP_NEVER;  in thp_read_settings()
234 		snprintf(path, PATH_MAX, "hugepages-%ukB/enabled",  in thp_read_settings()
236 		settings->hugepages[i].enabled =  in thp_read_settings()
242 			settings->shmem_hugepages[i].enabled = SHMEM_NEVER;  in thp_read_settings()
245 		snprintf(path, PATH_MAX, "hugepages-%ukB/shmem_enabled",  in thp_read_settings()
247 		settings->shmem_hugepages[i].enabled =  in thp_read_settings()
254 	struct khugepaged_settings *khugepaged = &settings->khugepaged;  in thp_write_settings()
261 	thp_write_string("enabled", thp_enabled_strings[settings->thp_enabled]);  in thp_write_settings()
262 	thp_write_string("defrag", thp_defrag_strings[settings->thp_defrag]);  in thp_write_settings()
264 			shmem_enabled_strings[settings->shmem_enabled]);  in thp_write_settings()
265 	thp_write_num("use_zero_page", settings->use_zero_page);  in thp_write_settings()
267 	thp_write_num("khugepaged/defrag", khugepaged->defrag);  in thp_write_settings()
269 			khugepaged->alloc_sleep_millisecs);  in thp_write_settings()
271 			khugepaged->scan_sleep_millisecs);  in thp_write_settings()
272 	thp_write_num("khugepaged/max_ptes_none", khugepaged->max_ptes_none);  in thp_write_settings()
273 	thp_write_num("khugepaged/max_ptes_swap", khugepaged->max_ptes_swap);  in thp_write_settings()
274 	thp_write_num("khugepaged/max_ptes_shared", khugepaged->max_ptes_shared);  in thp_write_settings()
275 	thp_write_num("khugepaged/pages_to_scan", khugepaged->pages_to_scan);  in thp_write_settings()
278 		write_num(dev_queue_read_ahead_path, settings->read_ahead_kb);  in thp_write_settings()
283 		snprintf(path, PATH_MAX, "hugepages-%ukB/enabled",  in thp_write_settings()
285 		enabled = settings->hugepages[i].enabled;  in thp_write_settings()
292 		snprintf(path, PATH_MAX, "hugepages-%ukB/shmem_enabled",  in thp_write_settings()
294 		enabled = settings->shmem_hugepages[i].enabled;  in thp_write_settings()
305 	return settings_stack + settings_index - 1;  in thp_current_settings()
324 	--settings_index;  in thp_pop_settings()
347 	dev_queue_read_ahead_path[sizeof(dev_queue_read_ahead_path) - 1] = '\0';  in thp_set_read_ahead_path()
360 		ret = snprintf(path, PATH_MAX, THP_SYSFS "hugepages-%ukB/%s",  in __thp_supported_orders()