linux-kernel - Re: [Patch 8/8] kexec: allow to shrink reserved memory

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Message-Id: <20090821093452.ead96b2d.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 21 Aug 2009 09:34:52 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Amerigo Wang <amwang@...hat.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, tony.luck@...el.com,
	linux-ia64@...r.kernel.org, linux-mm@...ck.org,
	Neil Horman <nhorman@...hat.com>,
	Andi Kleen <andi@...stfloor.org>, akpm@...ux-foundation.org,
	bernhard.walle@....de, Fenghua Yu <fenghua.yu@...el.com>,
	Ingo Molnar <mingo@...e.hu>,
	Anton Vorontsov <avorontsov@...mvista.com>
Subject: Re: [Patch 8/8] kexec: allow to shrink reserved memory

On Thu, 20 Aug 2009 17:15:56 +0800
Amerigo Wang <amwang@...hat.com> wrote:
    
> > The, problem is whether memmap is there or not. That's all.
> > plz see init sequence and check there are memmap.
> > If memory-for-crash is obtained via bootmem,
> > Don't you try to free memory hole ?
> >   
> 
> Hi,
> 
> It looks like that mem_map has 'struct page' for the reserved memory, I 
> checked my "early_node_map[] active PFN ranges" output, the reserved 
> memory area for crash kernel is right in one range. Am I missing 
> something here?
> 
> I don't know why that oops comes out, maybe because of no PTE for thoese 
> pages?
> 
Hmm ? Could you show me the code you use ?

Thanks,
-Kame


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