Currently file info from show_file() is printed out within page list
like below, but this is inconvenient a little to utilize the page list
from other scripts (maybe needs additional filtering).

    $ ./page-types -f page-types.c -l
    foffset offset  len     flags
    page-types.c Inode: 15108680 Size: 30953 (8 pages)
    Modify: Sat Oct  2 23:11:20 2021 (2399 seconds ago)
    Access: Sat Oct  2 23:11:28 2021 (2391 seconds ago)
    0       d9f59e  1       ___U_lA____________________________________
    1       1031eb5 1       __RU_l_____________________________________
    2       13bf717 1       __RU_l_____________________________________
    3       13ac333 1       ___U_lA____________________________________
    4       d9f59f  1       __RU_l_____________________________________
    5       183fd49 1       ___U_lA____________________________________
    6       13cbf69 1       ___U_lA____________________________________
    7       d9ef05  1       ___U_lA____________________________________

                 flags      page-count       MB  symbolic-flags                     long-symbolic-flags
    0x000000000000002c               3        0  __RU_l_____________________________________        referenced,uptodate,lru
    0x0000000000000068               5        0  ___U_lA____________________________________        uptodate,lru,active
                 total               8        0

With this patch file info is printed out in summary part like below:

    $ ./page-types -f page-types.c -l
    foffset offset  len     flags
    0       d9f59e  1       ___U_lA_____________________________________
    1       1031eb5 1       __RU_l______________________________________
    2       13bf717 1       __RU_l______________________________________
    3       13ac333 1       ___U_lA_____________________________________
    4       d9f59f  1       __RU_l______________________________________
    5       183fd49 1       ___U_lA_____________________________________
    6       13cbf69 1       ___U_lA_____________________________________

    page-types.c Inode: 15108680 Size: 30953 (8 pages)
    Modify: Sat Oct  2 23:11:20 2021 (2435 seconds ago)
    Access: Sat Oct  2 23:11:28 2021 (2427 seconds ago)

                 flags      page-count       MB  symbolic-flags                     long-symbolic-flags
    0x000000000000002c               3        0  __RU_l______________________________________       referenced,uptodate,lru
    0x0000000000000068               4        0  ___U_lA_____________________________________       uptodate,lru,active
                 total               7        0

Link: https://lkml.kernel.org/r/20211004061325.1525902-3-naoya.horiguchi@linux.devSigned-off-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Bin Wang <wangbin224@huawei.com>
Cc: Changbin Du <changbin.du@intel.com>
Cc: Christian Hansen <chansen3@cisco.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>