From: Daniel Phillips <phillips@bonn-fries.net>
To: "Stephen C. Tweedie" <sct@redhat.com>
Cc: 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 14:18:56 +0200 [thread overview]
Message-ID: <20010816121237Z16445-1231+1188@humbolt.nl.linux.org> (raw)
In-Reply-To: <20010816112631.N398@redhat.com>
On August 16, 2001 12:26 pm, Stephen C. Tweedie wrote:
> Hi,
>
> On Thu, Aug 16, 2001 at 10:30:35AM +0200, Daniel Phillips wrote:
>
> > because the use count is overloaded. So how about adding a PG_pinned
> > flag, and users need to set it for any page they intend to pin.
>
> 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.
> But yes, being able to distinguish freeable from unfreeable references
> to a page would be very useful, especially if we want to support very
> large memory allocations dynamically for things like i86 PSE 2MB/4MB
> page tables.
--
Daniel
--
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next prev parent reply other threads:[~2001-08-16 12:18 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 [this message]
2001-08-16 15:35 ` Eric W. Biederman
2001-08-16 16:37 ` Stephen C. Tweedie
2001-08-17 3:20 ` Eric W. Biederman
2001-08-17 11:45 ` Stephen C. Tweedie
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