Function init_thp_state

app/redis-6.2.6/deps/jemalloc/src/pages.c:515–559

}

static void
init_thp_state(void) {
	if (!have_madvise_huge) {
		if (metadata_thp_enabled() && opt_abort) {
			malloc_write("<jemalloc>: no MADV_HUGEPAGE support\n");
			abort();
		}
		goto label_error;
	}

	static const char sys_state_madvise[] = "always [madvise] never\n";
	static const char sys_state_always[] = "[always] madvise never\n";
	static const char sys_state_never[] = "always madvise [never]\n";
	char buf[sizeof(sys_state_madvise)];

#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_open)
	int fd = (int)syscall(SYS_open,
	    "/sys/kernel/mm/transparent_hugepage/enabled", O_RDONLY);
#else
	int fd = open("/sys/kernel/mm/transparent_hugepage/enabled", O_RDONLY);
#endif
	if (fd == -1) {
		goto label_error;
	}

	ssize_t nread = malloc_read_fd(fd, &buf, sizeof(buf));
#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_close)
	syscall(SYS_close, fd);
#else
	close(fd);
#endif

	if (strncmp(buf, sys_state_madvise, (size_t)nread) == 0) {
		init_system_thp_mode = thp_mode_default;
	} else if (strncmp(buf, sys_state_always, (size_t)nread) == 0) {
		init_system_thp_mode = thp_mode_always;
	} else if (strncmp(buf, sys_state_never, (size_t)nread) == 0) {
		init_system_thp_mode = thp_mode_never;
	} else {
		goto label_error;
	}
	return;
label_error:
	opt_thp = init_system_thp_mode = thp_mode_not_supported;
}

bool
pages_boot(void) {