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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:	Wed, 28 Aug 2013 17:34:28 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
CC:	rjw@...k.pl, lenb@...nel.org, tglx@...utronix.de, mingo@...e.hu,
	hpa@...or.com, akpm@...ux-foundation.org, tj@...nel.org,
	trenn@...e.de, yinghai@...nel.org, jiang.liu@...wei.com,
	wency@...fujitsu.com, laijs@...fujitsu.com,
	isimatu.yasuaki@...fujitsu.com, izumi.taku@...fujitsu.com,
	mgorman@...e.de, minchan@...nel.org, mina86@...a86.com,
	gong.chen@...ux.intel.com, vasilis.liaskovitis@...fitbricks.com,
	lwoodman@...hat.com, riel@...hat.com, jweiner@...hat.com,
	prarit@...hat.com, zhangyanfei@...fujitsu.com, x86@...nel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-acpi@...r.kernel.org
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.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/