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SubjectRe: [RFC V4] mm:add KPF_ZERO_PAGE flag for /proc/kpageflags
On Mon, Dec 08, 2014 at 10:00:50AM +0800, Wang, Yalin wrote:
> This patch add KPF_ZERO_PAGE flag for zero_page,
> so that userspace process can notice zero_page from
> /proc/kpageflags, and then do memory analysis more accurately.
>
> Signed-off-by: Yalin Wang <yalin.wang@sonymobile.com>
> ---
> Documentation/vm/pagemap.txt | 5 +++++
> fs/proc/page.c | 16 +++++++++++++---
> include/linux/huge_mm.h | 12 ++++++++++++
> include/uapi/linux/kernel-page-flags.h | 1 +
> mm/huge_memory.c | 7 +------
> 5 files changed, 32 insertions(+), 9 deletions(-)
>
> diff --git a/Documentation/vm/pagemap.txt b/Documentation/vm/pagemap.txt
> index 5948e45..fdeb06e 100644
> --- a/Documentation/vm/pagemap.txt
> +++ b/Documentation/vm/pagemap.txt
> @@ -62,6 +62,8 @@ There are three components to pagemap:
> 20. NOPAGE
> 21. KSM
> 22. THP
> + 23. BALLOON
> + 24. ZERO_PAGE
>
> Short descriptions to the page flags:
>
> @@ -102,6 +104,9 @@ Short descriptions to the page flags:
> 22. THP
> contiguous pages which construct transparent hugepages
>
> +24. ZERO_PAGE
> + zero page for pfn_zero or huge_zero page
> +
> [IO related page flags]
> 1. ERROR IO error occurred
> 3. UPTODATE page has up-to-date data

Would be nice to document BALLOON while you're there.
Otherwise looks good to me.

Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>

--
Kirill A. Shutemov


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