linux-kernel - Re: [Patch 1/8] kexec: allow to shrink reserved memory

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Message-ID: <4A91F4A0.2040009@redhat.com>
Date:	Mon, 24 Aug 2009 10:02:08 +0800
From:	Amerigo Wang <amwang@...hat.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	linux-kernel@...r.kernel.org, tony.luck@...el.com,
	linux-ia64@...r.kernel.org, Neil Horman <nhorman@...hat.com>,
	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	akpm@...ux-foundation.org, bernhard.walle@....de,
	Fenghua Yu <fenghua.yu@...el.com>,
	kamezawa.hiroyu@...fujitsu.com,
	Anton Vorontsov <avorontsov@...mvista.com>
Subject: Re: [Patch 1/8] kexec: allow to shrink reserved memory

Eric W. Biederman wrote:
> Amerigo Wang <amwang@...hat.com> writes:
>
>   
>> +
>> +	start = roundup(start, PAGE_SIZE);
>> +	end = roundup(start + new_size, PAGE_SIZE);
>> +
>> +	for (addr = end; addr < crashk_res.end; addr += PAGE_SIZE) {
>> +		ClearPageReserved(pfn_to_page(addr >> PAGE_SHIFT));
>> +		init_page_count(pfn_to_page(addr >> PAGE_SHIFT));
>> +		free_page((unsigned long)__va(addr));
>> +		totalram_pages++;
>>     
>
> Any chance we can move this inline snippet into a helper function in
> -mm.  To expose what is happening here to the mm developers.
>
>   

Yes, I believe so. In fact I also wanted to do this, but I forgot before 
I sent these patches... Will do it in the next version.

Thanks.


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