From: Hugh Dickins <hugh@veritas.com>
To: "Raghu R. Arur" <rra2002@cs.columbia.edu>
Cc: kenelnewbies@linux.org, linux-mm@kvack.org
Subject: Re: page flags
Date: Wed, 1 Oct 2003 23:53:30 +0100 (BST) [thread overview]
Message-ID: <Pine.LNX.4.44.0310012347200.7095-100000@localhost.localdomain> (raw)
In-Reply-To: <Pine.LNX.4.44.0310011346580.24073-100000@delhi.clic.cs.columbia.edu>
On Wed, 1 Oct 2003, Raghu R. Arur wrote:
>
> In 2.4.19 linux, I see that 9th bit of page->flags is not used for any
> flag. Is there a particular reason for doing so?
Up to 2.4.9 there was #define PG_swap_cache 9, but we deleted that as
unnecessary in 2.4.10, changing the PageSwapCache macro. It happens
to have stayed free ever since in 2.4, but I don't believe there's a
curse on that bit.
Hugh
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prev parent reply other threads:[~2003-10-01 22:53 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-01 17:49 Raghu R. Arur
2003-10-01 22:53 ` Hugh Dickins [this message]
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