linux-kernel - Re: [Patch v4 08/12] memory-hotplug: remove memmap of sparse-vmemmap

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Date:	Wed, 5 Dec 2012 11:23:33 +0800
From:	Jianguo Wu <wujianguo@...wei.com>
To:	Tang Chen <tangchen@...fujitsu.com>
CC:	Wen Congyang <wency@...fujitsu.com>, <x86@...nel.org>,
	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-acpi@...r.kernel.org>,
	<linux-s390@...r.kernel.org>, <linux-sh@...r.kernel.org>,
	<linux-ia64@...r.kernel.org>, <cmetcalf@...era.com>,
	<sparclinux@...r.kernel.org>, David Rientjes <rientjes@...gle.com>,
	Jiang Liu <liuj97@...il.com>, Len Brown <len.brown@...el.com>,
	<benh@...nel.crashing.org>, <paulus@...ba.org>,
	Christoph Lameter <cl@...ux.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Subject: Re: [Patch v4 08/12] memory-hotplug: remove memmap of sparse-vmemmap

Hi Tang,

On 2012/12/5 10:07, Tang Chen wrote:

> Hi Wu,
> 
> On 12/04/2012 08:20 PM, Jianguo Wu wrote:
> (snip)
>>>
>>> Seems that we have different ways to handle pages allocated by bootmem
>>> or by regular allocator. Is the checking way in [PATCH 09/12] available
>>> here ?
>>>
>>> +    /* bootmem page has reserved flag */
>>> +    if (PageReserved(page)) {
>>> ......
>>> +    }
>>>
>>> If so, I think we can just merge these two functions.
>>
>> Hmm, direct mapping table isn't allocated by bootmem allocator such as memblock, can't be free by put_page_bootmem().
>> But I will try to merge these two functions.
>>
> 
> Oh, I didn't notice this, thanks. :)
> 
> (snip)
> 
>>>> +
>>>> +    __split_large_page(kpte, address, pbase);
>>>
>>> Is this patch going to replace [PATCH 08/12] ?
>>>
>>
>> I wish to replace [PATCH 08/12], but need Congyang and Yasuaki to confirm first:)
>>
>>> If so, __split_large_page() was added and exported in [PATCH 09/12],
>>> then we should move it here, right ?
>>
>> yes.
>>
>> and what do you think about moving vmemmap_pud[pmd/pte]_remove() to arch/x86/mm/init_64.c,
>> to be consistent with vmemmap_populate() ?
> 
> It is a good idea since pud/pmd/pte related code could be platform
> dependent. And I'm also trying to move vmemmap_free() to
> arch/x86/mm/init_64.c too. I want to have a common interface just
> like vmemmap_populate(). :)
> 

Great.

>>
>> I will rework [PATCH 08/12] and [PATCH 09/12] soon.
> 
> I am rebasing the whole patch set now. And I think I chould finish part
> of your work too. A new patch-set is coming soon, and your rework is
> also welcome. :)
>

Since you are rebasing now, I will wait for your new patche-set :).

Thanks.
Jianguo Wu

> Thanks. :)
> 
> 
> 
> .
> 



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