tools/testing/selftests/mm/vm_util.h

Source file repositories/reference/linux-study-clean/tools/testing/selftests/mm/vm_util.h

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/mm/vm_util.h
Extension
.h
Size
5644 bytes
Lines
171
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct procmap_fd {
	int fd;
	struct procmap_query query;
};

static inline unsigned int psize(void)
{
	if (!__page_size)
		__page_size = sysconf(_SC_PAGESIZE);
	return __page_size;
}

static inline unsigned int pshift(void)
{
	if (!__page_shift)
		__page_shift = (ffsl(psize()) - 1);
	return __page_shift;
}

static inline void force_read_pages(char *addr, unsigned int nr_pages,
				    size_t pagesize)
{
	for (unsigned int i = 0; i < nr_pages; i++)
		FORCE_READ(addr[i * pagesize]);
}

bool detect_huge_zeropage(void);

/*
 * Plan 9 FS has bugs (at least on QEMU) where certain operations fail with
 * ENOENT on unlinked files. See
 * https://gitlab.com/qemu-project/qemu/-/issues/103 for some info about such
 * bugs. There are rumours of NFS implementations with similar bugs.
 *
 * Ideally, tests should just detect filesystems known to have such issues and
 * bail early. But 9pfs has the additional "feature" that it causes fstatfs to
 * pass through the f_type field from the host filesystem. To avoid having to
 * scrape /proc/mounts or some other hackery, tests can call this function when
 * it seems such a bug might have been encountered.
 */
static inline void skip_test_dodgy_fs(const char *op_name)
{
	ksft_test_result_skip("%s failed with ENOENT. Filesystem might be buggy (9pfs?)\n", op_name);
}

uint64_t pagemap_get_entry(int fd, char *start);
bool pagemap_is_softdirty(int fd, char *start);
bool pagemap_is_swapped(int fd, char *start);
bool pagemap_is_populated(int fd, char *start);
unsigned long pagemap_get_pfn(int fd, char *start);
void clear_softdirty(void);
bool check_for_pattern(FILE *fp, const char *pattern, char *buf, size_t len);
uint64_t read_pmd_pagesize(void);
unsigned long rss_anon(void);
bool check_huge_anon(void *addr, int nr_hpages, uint64_t hpage_size);
bool check_huge_file(void *addr, int nr_hpages, uint64_t hpage_size);
bool check_huge_shmem(void *addr, int nr_hpages, uint64_t hpage_size);
int64_t allocate_transhuge(void *ptr, int pagemap_fd);
unsigned long default_huge_page_size(void);
int detect_hugetlb_page_sizes(size_t sizes[], int max);
int pageflags_get(unsigned long pfn, int kpageflags_fd, uint64_t *flags);

int uffd_register(int uffd, void *addr, uint64_t len,
		  bool miss, bool wp, bool minor);
int uffd_unregister(int uffd, void *addr, uint64_t len);
int uffd_register_with_ioctls(int uffd, void *addr, uint64_t len,
			      bool miss, bool wp, bool minor, uint64_t *ioctls);
unsigned long get_free_hugepages(void);
bool check_vmflag_io(void *addr);
bool check_vmflag_pfnmap(void *addr);
bool check_vmflag_guard(void *addr);
int open_procmap(pid_t pid, struct procmap_fd *procmap_out);
int query_procmap(struct procmap_fd *procmap);
bool find_vma_procmap(struct procmap_fd *procmap, void *address);
int close_procmap(struct procmap_fd *procmap);
int write_sysfs(const char *file_path, unsigned long val);
int read_sysfs(const char *file_path, unsigned long *val);
bool softdirty_supported(void);

static inline int open_self_procmap(struct procmap_fd *procmap_out)
{
	pid_t pid = getpid();

	return open_procmap(pid, procmap_out);
}

/* These helpers need to be inline to match the kselftest.h idiom. */
static char test_name[1024];

static inline void log_test_start(const char *name, ...)

Annotation

Implementation Notes