linux-kernel - Re: [PATCH 03/35] xen: document Xen is using an unused bit for the pagetables

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Message-ID: <20120529160128.GC21339@redhat.com>
Date:	Tue, 29 May 2012 18:01:29 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Hillf Danton <dhillf@...il.com>, Dan Smith <danms@...ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>
Subject: Re: [PATCH 03/35] xen: document Xen is using an unused bit for the
 pagetables

Hi,

On Tue, May 29, 2012 at 10:10:49AM -0400, Konrad Rzeszutek Wilk wrote:
> Oh, your git comment says "the last reserved bit". Let me
> look through all your patches to see how the AutoNUMA code works -
> I am probably just missing something simple.

Ah, with "the last reserved bit" I didn't mean AutoNUMA is using
it. It just means there is nothing left if somebody in the future
needs it. AutoNUMA happened to need it initially, but I figured how I
was better off not using it. Initially I had to make AUTONUMA=y
mutually exclusive with XEN=y but it's not the case anymore. So at
this point the patch is only a cleanup, I could drop it too but I
thought it was cleaner to keep it.
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