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    Subject[RFC][PATCH 2/3] pagemap: export KPF_THP
    Date
    This flag shows that a given pages is a subpage of transparent hugepage.
    It does not care about whether it is a head page or a tail page, because
    it's clear from pfn of the target page which you should know when you read
    /proc/kpageflags.

    Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
    ---
    fs/proc/page.c | 5 +++++
    include/linux/kernel-page-flags.h | 4 ++++
    2 files changed, 9 insertions(+), 0 deletions(-)

    diff --git 3.2-rc5.orig/fs/proc/page.c 3.2-rc5/fs/proc/page.c
    index 6d8e6a9..d436fc6 100644
    --- 3.2-rc5.orig/fs/proc/page.c
    +++ 3.2-rc5/fs/proc/page.c
    @@ -116,6 +116,11 @@ u64 stable_page_flags(struct page *page)
    if (PageHuge(page))
    u |= 1 << KPF_HUGE;

    +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
    + if (PageTransCompound(page))
    + u |= 1 << KPF_THP;
    +#endif
    +
    /*
    * Caveats on high order pages: page->_count will only be set
    * -1 on the head page; SLUB/SLQB do the same for PG_slab;
    diff --git 3.2-rc5.orig/include/linux/kernel-page-flags.h 3.2-rc5/include/linux/kernel-page-flags.h
    index bd92a89..7b83ee7 100644
    --- 3.2-rc5.orig/include/linux/kernel-page-flags.h
    +++ 3.2-rc5/include/linux/kernel-page-flags.h
    @@ -31,6 +31,10 @@

    #define KPF_KSM 21

    +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
    +#define KPF_THP 22
    +#endif
    +
    /* kernel hacking assistances
    * WARNING: subject to change, never rely on them!
    */
    --
    1.7.7.3


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