linux-kernel - Re: [RFC PATCH 3/11] x86, mm, pat: Change reserve

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Date:	Tue, 15 Jul 2014 12:56:57 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Toshi Kani <toshi.kani@...com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	plagnioj@...osoft.com, tomi.valkeinen@...com,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Stefan Bader <stefan.bader@...onical.com>,
	Dave Airlie <airlied@...il.com>, Borislav Petkov <bp@...en8.de>
Subject: Re: [RFC PATCH 3/11] x86, mm, pat: Change reserve_memtype() to handle
 WT type

On Tue, Jul 15, 2014 at 12:34 PM, Toshi Kani <toshi.kani@...com> wrote:
> This patch changes reserve_memtype() to handle the new WT type.
> When (!pat_enabled && new_type), it continues to set either WB
> or UC- to *new_type.  When pat_enabled, it can reserve a given
> non-RAM range for WT.  At this point, it may not reserve a RAM
> range for WT since reserve_ram_pages_type() uses the page flags
> limited to three memory types, WB, WC and UC.

FWIW, last time I looked at this, it seemed like all the fancy
reserve_ram_pages stuff was unnecessary: shouldn't the RAM type be
easy to track in the direct map page tables?

--Andy
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