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    Subject[RFC PATCH 03/16] mm: proc: add 1GB THP kpageflag.
    Date
    From: Zi Yan <ziy@nvidia.com>

    Bit 27 is used to identify 1GB THP.

    Signed-off-by: Zi Yan <ziy@nvidia.com>
    ---
    fs/proc/page.c | 2 ++
    include/uapi/linux/kernel-page-flags.h | 2 ++
    2 files changed, 4 insertions(+)

    diff --git a/fs/proc/page.c b/fs/proc/page.c
    index f3b39a7d2bf3..e4e2ad3612c9 100644
    --- a/fs/proc/page.c
    +++ b/fs/proc/page.c
    @@ -161,6 +161,8 @@ u64 stable_page_flags(struct page *page)
    u |= BIT_ULL(KPF_ZERO_PAGE);
    u |= BIT_ULL(KPF_THP);
    }
    + if (compound_order(head) == HPAGE_PUD_ORDER)
    + u |= 1 << KPF_PUD_THP;
    } else if (is_zero_pfn(page_to_pfn(page)))
    u |= BIT_ULL(KPF_ZERO_PAGE);

    diff --git a/include/uapi/linux/kernel-page-flags.h b/include/uapi/linux/kernel-page-flags.h
    index 6f2f2720f3ac..cdeb33ab655c 100644
    --- a/include/uapi/linux/kernel-page-flags.h
    +++ b/include/uapi/linux/kernel-page-flags.h
    @@ -36,5 +36,7 @@
    #define KPF_ZERO_PAGE 24
    #define KPF_IDLE 25
    #define KPF_PGTABLE 26
    +#define KPF_PUD_THP 27
    +

    #endif /* _UAPILINUX_KERNEL_PAGE_FLAGS_H */
    --
    2.28.0
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