linux-kernel - struct page field arrangement

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Message-Id: <45E5A05F.76E4.0078.0@novell.com>
Date:	Wed, 28 Feb 2007 14:31:43 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Hugh Dickins" <hugh@...itas.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: struct page field arrangement

A change early last year reordered struct page so that ptl overlaps not only
private, but also mapping. Since spinlock_t can be much larger, I'm wondering
whether there's a reason to not also overlay the space index and lru take -
are these used for anything on page table pages?

Thanks, Jan
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