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    Subject[PATCH 4/4] pagemap: document KPF_THP and make page-types aware of it
    Date
    page-types, which is a common user of pagemap, gets aware of thp
    with this patch. This helps system admins and kernel hackers know
    about how thp works.
    Here is a sample output of page-types over a thp:

    $ page-types -p <pid> --raw --list

    voffset offset len flags
    ...
    7f9d40200 3f8400 1 ___U_lA____Ma_bH______t____________
    7f9d40201 3f8401 1ff ________________T_____t____________

    flags page-count MB symbolic-flags long-symbolic-flags
    0x0000000000410000 511 1 ________________T_____t____________ compound_tail,thp
    0x000000000040d868 1 0 ___U_lA____Ma_bH______t____________ uptodate,lru,active,mmap,anonymous,swapbacked,compound_head,thp

    Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
    Acked-by: Wu Fengguang <fengguang.wu@intel.com>

    Changes since v1:
    - fix misused word
    ---
    Documentation/vm/page-types.c | 2 ++
    Documentation/vm/pagemap.txt | 4 ++++
    2 files changed, 6 insertions(+), 0 deletions(-)

    diff --git 3.2-rc5.orig/Documentation/vm/page-types.c 3.2-rc5/Documentation/vm/page-types.c
    index 7445caa..0b13f02 100644
    --- 3.2-rc5.orig/Documentation/vm/page-types.c
    +++ 3.2-rc5/Documentation/vm/page-types.c
    @@ -98,6 +98,7 @@
    #define KPF_HWPOISON 19
    #define KPF_NOPAGE 20
    #define KPF_KSM 21
    +#define KPF_THP 22

    /* [32-] kernel hacking assistances */
    #define KPF_RESERVED 32
    @@ -147,6 +148,7 @@ static const char *page_flag_names[] = {
    [KPF_HWPOISON] = "X:hwpoison",
    [KPF_NOPAGE] = "n:nopage",
    [KPF_KSM] = "x:ksm",
    + [KPF_THP] = "t:thp",

    [KPF_RESERVED] = "r:reserved",
    [KPF_MLOCKED] = "m:mlocked",
    diff --git 3.2-rc5.orig/Documentation/vm/pagemap.txt 3.2-rc5/Documentation/vm/pagemap.txt
    index df09b96..4600cbe 100644
    --- 3.2-rc5.orig/Documentation/vm/pagemap.txt
    +++ 3.2-rc5/Documentation/vm/pagemap.txt
    @@ -60,6 +60,7 @@ There are three components to pagemap:
    19. HWPOISON
    20. NOPAGE
    21. KSM
    + 22. THP

    Short descriptions to the page flags:

    @@ -97,6 +98,9 @@ Short descriptions to the page flags:
    21. KSM
    identical memory pages dynamically shared between one or more processes

    +22. THP
    + contiguous pages which construct transparent hugepages
    +
    [IO related page flags]
    1. ERROR IO error occurred
    3. UPTODATE page has up-to-date data
    --
    1.7.7.3


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