From: "Stephen C. Tweedie" <sct@redhat.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Daniel Phillips <phillips@bonn-fries.net>,
"Stephen C. Tweedie" <sct@redhat.com>,
Linus Torvalds <torvalds@transmeta.com>,
Hugh Dickins <hugh@veritas.com>,
Marcelo Tosatti <marcelo@conectiva.com.br>,
linux-mm@kvack.org
Subject: Re: 0-order allocation problem
Date: Thu, 16 Aug 2001 17:37:33 +0100 [thread overview]
Message-ID: <20010816173733.Y398@redhat.com> (raw)
In-Reply-To: <m1itfoow4p.fsf@frodo.biederman.org>; from ebiederm@xmission.com on Thu, Aug 16, 2001 at 09:35:50AM -0600
Hi,
On Thu, Aug 16, 2001 at 09:35:50AM -0600, Eric W. Biederman wrote:
> > > It needs to be a count, not a flag (consider multiple mlock() calls
> > > from different processes, or multiple direct IO writeouts from the
> > > same memory to disk.)
> >
> > Yes, the question is how to do this without adding a yet another field
> > to struct page.
>
> atomic_add(&page->count, 65536);
That only leaves 8 bits for the pinned references (some architectures
limit atomic_t to 24 bits), and 16 bits for genuine references isn't
enough for some pages such as the zero page.
Cheers,
Stephen
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next prev parent reply other threads:[~2001-08-16 16:37 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.21.0108152049100.973-100000@localhost.localdomain>
2001-08-15 20:45 ` Linus Torvalds
2001-08-15 20:55 ` Marcelo Tosatti
2001-08-15 22:30 ` Linus Torvalds
2001-08-15 22:34 ` Rik van Riel
2001-08-15 23:27 ` Hugh Dickins
2001-08-15 22:15 ` Marcelo Tosatti
2001-08-15 22:00 ` Rik van Riel
2001-08-15 22:15 ` Rik van Riel
2001-08-15 23:09 ` Hugh Dickins
2001-08-15 21:54 ` Marcelo Tosatti
2001-08-15 23:38 ` Rik van Riel
2001-08-16 0:07 ` Hugh Dickins
2001-08-15 22:44 ` Marcelo Tosatti
2001-08-16 0:50 ` Linus Torvalds
2001-08-16 8:30 ` Daniel Phillips
2001-08-16 10:26 ` Stephen C. Tweedie
2001-08-16 12:18 ` Daniel Phillips
2001-08-16 15:35 ` Eric W. Biederman
2001-08-16 16:37 ` Stephen C. Tweedie [this message]
2001-08-17 3:20 ` Eric W. Biederman
2001-08-17 11:45 ` Stephen C. Tweedie
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