selftests: add selftests for cachestat

Test cachestat on a newly created file, /dev/ files, /proc/ files and a
directory.  Also test on a shmem file (which can also be tested with
huge pages since tmpfs supports huge pages).

[[email protected]: fix spelling mistake "trucate" -> "truncate"]
  Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: avoid excessive stack allocation]
  Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Nhat Pham <[email protected]>
Signed-off-by: Colin Ian King <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Acked-by: Johannes Weiner <[email protected]>
Cc: Brian Foster <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Cc: Michael Kerrisk <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Michael Ellerman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions