linux-kernel - Re: [RFC][PATCH 0/3] kcore: clean up and update ram information properly

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Message-Id: <20090722092757.ef6326a6.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 22 Jul 2009 09:27:57 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, ebiederm@...ssion.com,
	xiyou.wangcong@...il.com, tao.ma@...cle.com,
	linux-kernel@...r.kernel.org, adobriyan@...il.com,
	mtk.manpages@...il.com, y-goto@...fujitsu.com
Subject: Re: [RFC][PATCH 0/3] kcore: clean up and update ram information
 properly

On Tue, 21 Jul 2009 13:29:57 +0200
Andi Kleen <andi@...stfloor.org> wrote:

> KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> writes:
> 
> > Now, /proc/kcore is built on kclist information which is constructed at boot.
> > This kclist includes physical memory range information but not updated at
> > memory hotplug. And, this information tends to includes big memory hole.
> >
> > On the other hand, /proc/iomem includes all physical memory information as
> > "System RAM" and this is updated properly and kdump use this, IIUC. 
> > (I hope all archtecuture stores necessary information...)
> >
> > This patch tries to build kclist for physical memory(direct map) on
> > /proc/iomem info. It's refreshed at open("/proc/kcore",) if necesasry.
> >
> > This is just a RFC. Any comments are welcome.
> >
> > [1/3] ... clean up kclist handling.
> > [2/3] ... clean up kclist_add()
> > [3/3] ... use /proc/iomem information for /proc/kcore.
> 
> Great cleanup! Thanks.
> 
Thank you. I'll reveiw this set again and post v2.

> The only missing part that we still need is to also include 
> the kallsyms information, then the core would be even more useful.
> 
yes.

Thanks,
-Kame

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