linux-kernel - Re: [PATCH 5/5] Add the array length of "free

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Message-ID: <20071116191624.GD8971@verge.net.au>
Date:	Fri, 16 Nov 2007 11:16:30 -0800
From:	Simon Horman <horms@...ge.net.au>
To:	Ken'ichi Ohmichi <oomichi@....nes.nec.co.jp>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	kexec-ml <kexec@...ts.infradead.org>
Subject: Re: [PATCH 5/5] Add the array length of "free_list" for filtering free pages

On Fri, Nov 16, 2007 at 11:33:26AM +0900, Ken'ichi Ohmichi wrote:
> 
> This patch adds the array length of "free_area.free_list" to the vmcoreinfo
> data so that makedumpfile (dump filtering command) can exclude all free pages
> in linux-2.6.24.
> 
> makedumpfile creates a small dumpfile by excluding unnecessary pages for the
> analysis. To distinguish unnecessary pages, makedumpfile gets the vmcoreinfo
> data which has the minimum debugging information only for dump filtering.
> 
> In 2.6.24-rc1 or later, the free_area.free_list is an array which has one list
> for each migrate types instead of a single list. makedumpfile needs the array
> length of "free_area.free_list" and the vmcoreinfo data should contain it.
> 
> 
> Signed-off-by: Huang Ying <ying.huang@...el.com>
> Tested-by: Ken'ichi Ohmichi <oomichi@....nes.nec.co.jp>

This seems fine to me. Though from a point of maintainability
would it be better if VMCOREINFO_LENGTH derived the length
from the element of the type in question. Just a thought,
I haven't hacked it up to see how practical it might be.

Acked-by: Simon Horman <horms@...ge.net.au>
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