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

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Message-Id: <20080910060431.188081541FE@magilla.localdomain>
Date:	Tue,  9 Sep 2008 23:04:31 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
Cc:	Mel Gorman <mel@....ul.ie>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	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>,
	sugita <yumiko.sugita.yf@...achi.com>,
	Satoshi OSHIMA <satoshi.oshima.fk@...achi.com>
Subject: Re: [PATCH] coredump_filter: add hugepage core dumping

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.)

Thanks,
Roland
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