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

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Message-ID: <53C5C1C9.6070100@zytor.com>
Date:	Tue, 15 Jul 2014 17:05:29 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Toshi Kani <toshi.kani@...com>,
	Andy Lutomirski <luto@...capital.net>
CC:	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 07/15/2014 04:53 PM, Toshi Kani wrote:
> 
> Right.
> 
> I think using struct page table for the RAM ranges is a good way for
> saving memory, but I wonder how often the RAM ranges are mapped other
> than WB...  If not often, reserve_memtype() could simply call
> rbt_memtype_check_insert() for all ranges, including RAM.
> 
> In this patch, I left using reserve_ram_pages_type() since I do not see
> much reason to use WT for RAM, either.
> 

They get flipped to WC or WT or even UC for some I/O devices, but
ultimately the number of ranges is pretty small.

	-hpa


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