linux-kernel - Re: Uncool feature for TTM introduced by x86, pat: Use page flags to track memtypes of RAM pages

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Message-ID: <87aav65u9g.fsf@basil.nowhere.org>
Date:	Thu, 18 Feb 2010 18:27:39 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Jerome Glisse <glisse@...edesktop.org>
Cc:	hpa@...or.com, suresh.b.siddha@...el.com,
	venkatesh.pallipadi@...el.com, thellstrom@...are.com,
	airlied@...ux.ie, currojerez@...eup.net,
	linux-kernel@...r.kernel.org
Subject: Re: Uncool feature for TTM introduced by x86, pat: Use page flags to track memtypes of RAM pages

Jerome Glisse <glisse@...edesktop.org> writes:
>
> Can we modify the interface to support again changing from uc to wc
> or wc to uc ? (i can try to do a patch for that).

At least on Intel CPUs that support self-snoop (all modern
ones) that should really be very cheap.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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