linux-kernel - Re: [PATCH 0/8] x86, acpi: Move acpi_initrd

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Message-ID: <bf688aac-4080-4ac6-83cd-fd66cef6ce1a@email.android.com>
Date:	Fri, 23 Aug 2013 16:24:06 +0200
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Toshi Kani <toshi.kani@...com>,
	Zhang Yanfei <zhangyanfei.yes@...il.com>,
	Tang Chen <tangchen@...fujitsu.com>, konrad.wilk@...cle.com,
	robert.moore@...el.com, lv.zheng@...el.com, rjw@...k.pl,
	lenb@...nel.org, tglx@...utronix.de, mingo@...e.hu,
	akpm@...ux-foundation.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,
	yanghy@...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 0/8] x86, acpi: Move acpi_initrd_override() earlier.

Well... relying on MTRRs is a big cost in complexity and failure modes.

Tejun Heo <tj@...nel.org> wrote:
>Hello,
>
>On Fri, Aug 23, 2013 at 03:08:55PM +0200, H. Peter Anvin wrote:
>> What is the point of 1G+MTRR?  If there are caching differences the
>> TLB will fracture the pages anyway.
>
>Ah, right.  Consuming less memory / cachelines would still be a small
>advantage tho unless creating split TLB from larger mapping is
>noticeably less efficient.  If the extra logic to do that is small,
>which I think it'd be, it'd be a gain at almost no cost.
>
>Thanks.

-- 
Sent from my mobile phone. Please excuse brevity and lack of formatting.
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