Message-ID: <1377282543.10300.820.camel@misato.fc.hp.com>
Subject: Re: [PATCH 0/8] x86, acpi: Move acpi_initrd_override() earlier.
From: Toshi Kani <toshi.kani@hp.com>
To: Zhang Yanfei <zhangyanfei.yes@gmail.com>
Cc: Tejun Heo <tj@kernel.org>, Tang Chen <tangchen@cn.fujitsu.com>,
        konrad.wilk@oracle.com, robert.moore@intel.com, lv.zheng@intel.com,
        rjw@sisk.pl, lenb@kernel.org, tglx@linutronix.de, mingo@elte.hu,
        hpa@zytor.com, akpm@linux-foundation.org, trenn@suse.de,
        yinghai@kernel.org, jiang.liu@huawei.com, wency@cn.fujitsu.com,
        laijs@cn.fujitsu.com, isimatu.yasuaki@jp.fujitsu.com,
        izumi.taku@jp.fujitsu.com, mgorman@suse.de, minchan@kernel.org,
        mina86@mina86.com, gong.chen@linux.intel.com,
        vasilis.liaskovitis@profitbricks.com, lwoodman@redhat.com,
        riel@redhat.com, jweiner@redhat.com, prarit@redhat.com,
        zhangyanfei@cn.fujitsu.com, yanghy@cn.fujitsu.com, x86@kernel.org,
        linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, linux-acpi@vger.kernel.org
Date: Fri, 23 Aug 2013 12:29:03 -0600
In-Reply-To: <521793BB.9080605@gmail.com>
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Hello Zhang,

On Sat, 2013-08-24 at 00:54 +0800, Zhang Yanfei wrote:
> > Tang, what do you think?  Are you OK to try Tejun's suggestion as well? 
> > 
> 
> By saying TJ's suggestion, you mean, we will let memblock to control the
> behaviour, that said, we will do early allocations near the kernel image
> range before we get the SRAT info?

Right.

> If so, yeah, we have been working on this direction. 

Great!

> By doing this, we may
> have two main changes:
> 
> 1. change some of memblock's APIs to make it have the ability to allocate
>    memory from low address.
> 2. setup kernel page table down-top. Concretely, we first map the memory
>    just after the kernel image to the top, then, we map 0 - kernel image end.
> 
> Do you guys think this is reasonable and acceptable?

Have you also looked at Yinghai's comments below?

http://www.spinics.net/lists/linux-mm/msg61362.html

Thanks,
-Toshi

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