linux-kernel - Re: [PATCH] X86: MM: Add PAT Type write-through in combination with mtrr

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Message-ID: <9f8cb8da-e453-464a-8c95-9d06b58ad613@email.android.com>
Date:	Mon, 28 Oct 2013 03:31:58 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>
CC:	Andreas Werner <wernerandy@....de>, tglx@...utronix.de,
	mingo@...hat.com, x86@...nel.org, dave@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] X86: MM: Add PAT Type write-through in combination with mtrr

Sort of; the writes combine in the cache.

Borislav Petkov <bp@...en8.de> wrote:
>On Mon, Oct 28, 2013 at 11:17:49AM +0100, Ingo Molnar wrote:
>> And regular write-back cacheable isn't sufficient because the CPU
>> could do things like prefetch your range automatically?
>
>Yeah, he's doing a CLFLUSH anyway which basically makes it a
>write-through...

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