Date: Wed, 11 Jan 2006 17:18:28 +0000 (GMT)
From: Hugh Dickins <hugh@veritas.com>
To: Octavio Alvarez Piza <alvarezp@alvarezp.ods.org>
cc: Dave Jones <davej@redhat.com>, Arjan van de Ven <arjan@infradead.org>,
       Andrew Morton <akpm@osdl.org>, nickpiggin@yahoo.com.au,
       linux-kernel@vger.kernel.org
Subject: Re: mm/rmap.c negative page map count BUG.
In-Reply-To: <20060111085843.1d79e045@octavio.alvarezp.pri>
Message-ID: <Pine.LNX.4.61.0601111711510.5071@goblin.wat.veritas.com>
References: <20060103082609.GB11738@redhat.com> <43BA630F.1020805@yahoo.com.au>
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 <20060105111520.GL20809@redhat.com> <op.s2w4pyqm4oyyg1@octavio.tecbc.mx>
 <20060111000111.5fa4bdce@octavio.alvarezp.pri>
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On Wed, 11 Jan 2006, Octavio Alvarez Piza wrote:
> 
> BTW, what's the first 8 in flags:0x80010008? I can't find 1<<31 in
> include/linux/page-flags.h

It's the zone that page belongs to (you won't, I think, get involved
in nodes and sections): see helpful comment on "page->flags layout"
in include/linux/mm.h, and definitions in include/linux/mmzone.h.

I'd have to make a fool of myself by doing arithmetic in public,
probably getting it wrong, to tell you precisely which zone the
8 meant in 2.6.15 in your config; but it's not interesting anyway.

Hugh
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