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Date: Wed, 10 Sep 2008 15:53:44 +0900
From: "KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com>
To: "Roland McGrath" <roland@redhat.com>
Subject: Re: [PATCH] coredump_filter: add hugepage core dumping
Cc: "Hidehiro Kawai" <hidehiro.kawai.ez@hitachi.com>,
       "Mel Gorman" <mel@csn.ul.ie>, "Hugh Dickins" <hugh@veritas.com>,
       "William Irwin" <wli@holomorphy.com>, "Adam Litke" <agl@us.ibm.com>,
       LKML <linux-kernel@vger.kernel.org>,
       "Andrew Morton" <akpm@linux-foundation.org>,
       sugita <yumiko.sugita.yf@hitachi.com>,
       "Satoshi OSHIMA" <satoshi.oshima.fk@hitachi.com>
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> It was certainly not meant to be excluded from any documentation.
>
> To make the description clear, MMF_DUMP_ELF_HEADERS applies when a
> file-backed private mapping would otherwise be elided (based on the other
> bits and whether it's been modified).  If the vma maps offset 0 of the
> file, and that page is readable and starts with ELFMAG, then just that
> first page will be dumped.  (So p_filesz will be PAGE_SIZE rather than 0
> for an elided mapping, or p_memsz for a mapping dumped whole.)

Could you please make the patch.
Then, I'll ack it with presure.

Thanks.