linux-kernel - Re: [PATCH] coredump_filter: add hugepage core dumping

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Date:	Tue, 9 Sep 2008 20:20:32 +0900
From:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>
To:	"Hidehiro Kawai" <hidehiro.kawai.ez@...achi.com>
Cc:	"Mel Gorman" <mel@....ul.ie>, "Hugh Dickins" <hugh@...itas.com>,
	"William Irwin" <wli@...omorphy.com>,
	"Adam Litke" <agl@...ibm.com>, LKML <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>, roland@...hat.com,
	sugita <yumiko.sugita.yf@...achi.com>,
	"Satoshi OSHIMA" <satoshi.oshima.fk@...achi.com>
Subject: Re: [PATCH] coredump_filter: add hugepage core dumping

> I think it was just forgotten to be updated.  Bit 4 was introduced
> by Roland McGrath, and it means elf header pages in file-backed
> private VMAs are dumped even if bit 2 is cleared.
>
> Thanks,
>
>
> Subject: [PATCH] coredump_filter: add description of bit 4
>
> There is no description of bit 4 of coredump_filter in the
> documentation.  This patch adds it.
>
> Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
> CC: Roland McGrath <roland@...hat.com>
> ---
>  Documentation/filesystems/proc.txt |    2 ++
>  1 file changed, 2 insertions(+)
>
> Index: linux-2.6.27-rc5/Documentation/filesystems/proc.txt
> ===================================================================
> --- linux-2.6.27-rc5.orig/Documentation/filesystems/proc.txt
> +++ linux-2.6.27-rc5/Documentation/filesystems/proc.txt
> @@ -2394,6 +2394,8 @@ The following 4 memory types are support
>   - (bit 1) anonymous shared memory
>   - (bit 2) file-backed private memory
>   - (bit 3) file-backed shared memory
> +  - (bit 4) ELF header pages in file-backed private memory areas (it is
> +            effective only if the bit 2 is cleared)
>
>   Note that MMIO pages such as frame buffer are never dumped and vDSO pages
>   are always dumped regardless of the bitmask status.

Very thanks, kawai-san.

Acked-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
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