linux-kernel - Re: [PATCH 00/11] x86, memblock: Allocate memory near kernel image before SRAT parsed.

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Message-ID: <521DC424.5000500@cn.fujitsu.com>
Date:	Wed, 28 Aug 2013 17:34:28 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
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Subject: Re: [PATCH 00/11] x86, memblock: Allocate memory near kernel image
 before SRAT parsed.

Hi Wanpeng

On 08/28/2013 04:03 PM, Wanpeng Li wrote:
> Hi Tang,
......
>> [About this patch-set]
>>
>> So this patch-set does the following:
>>
>> 1. Make memblock be able to allocate memory from low address to high address.
>
> I want to know if there is fragmentation degree difference here?
>

Before this patch-set, we mapped memory like this:

1. [0, ISA_END_ADDRESS),
2. [ISA_END_ADDRESS, round_down(max_addr, PMD_SIZE)), from top downwards,
3. [round_down(max_addr, PMD_SIZE), max_addr)


After this patch-set, when movablenode is enabled, it is like:

1. [round_up(_end, PMD_SIZE), max_addr), from _end upwards,
2. [ISA_END_ADDRESS, round_up(_end, PMD_SIZE)),
3. [0, ISA_END_ADDRESS)


All the boundaries are aligned with PMD_SIZE. I think it is the same.

Thanks.

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