From: Dave Hansen <haveblue@us.ibm.com>
To: Jes Sorensen <jes@wildopensource.com>
Cc: Andrew Morton <akpm@osdl.org>, Matthew Wilcox <matthew@wil.cx>,
linux-ia64@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [patch -mm series] ia64 specific /dev/mem handlers
Date: Wed, 23 Feb 2005 00:48:44 +0000 [thread overview]
Message-ID: <1109119724.7277.25.camel@localhost> (raw)
In-Reply-To: <yq0650kl1gd.fsf@jaguar.mkp.net>
On Tue, 2005-02-22 at 16:38 -0500, Jes Sorensen wrote:
> >>>>> "Dave" = Dave Hansen <haveblue@us.ibm.com> writes:
>
> Dave> I was talking with Nigel Cunningham about doing something a
> Dave> little different from the classic page flag bits when the number
> Dave> of users is restricted and performance isn't ultra-critical.
> Dave> Would something like this work for you, instead of using a real
> Dave> page->flags bit for PG_cached?
>
> Just took a quick look at this and it looks a bit heavy for our
> use. We are only looking at a small number of pages. However I could
> imagine future cases where performance may be more critical.
If it's a quite small number (or range) of pages, perhaps a short
list_head list would suffice. It would sure beat consuming a page flag.
-- Dave
WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <haveblue@us.ibm.com>
To: Jes Sorensen <jes@wildopensource.com>
Cc: Andrew Morton <akpm@osdl.org>, Matthew Wilcox <matthew@wil.cx>,
linux-ia64@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [patch -mm series] ia64 specific /dev/mem handlers
Date: Tue, 22 Feb 2005 16:48:44 -0800 [thread overview]
Message-ID: <1109119724.7277.25.camel@localhost> (raw)
In-Reply-To: <yq0650kl1gd.fsf@jaguar.mkp.net>
On Tue, 2005-02-22 at 16:38 -0500, Jes Sorensen wrote:
> >>>>> "Dave" == Dave Hansen <haveblue@us.ibm.com> writes:
>
> Dave> I was talking with Nigel Cunningham about doing something a
> Dave> little different from the classic page flag bits when the number
> Dave> of users is restricted and performance isn't ultra-critical.
> Dave> Would something like this work for you, instead of using a real
> Dave> page->flags bit for PG_cached?
>
> Just took a quick look at this and it looks a bit heavy for our
> use. We are only looking at a small number of pages. However I could
> imagine future cases where performance may be more critical.
If it's a quite small number (or range) of pages, perhaps a short
list_head list would suffice. It would sure beat consuming a page flag.
-- Dave
next prev parent reply other threads:[~2005-02-23 0:48 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-22 9:52 [patch -mm series] ia64 specific /dev/mem handlers Jes Sorensen
2005-02-22 9:52 ` Jes Sorensen
2005-02-22 10:03 ` Andrew Morton
2005-02-22 10:03 ` Andrew Morton
2005-02-22 12:08 ` Andi Kleen
2005-02-22 12:08 ` Andi Kleen
2005-02-22 14:41 ` Jes Sorensen
2005-02-22 14:41 ` Jes Sorensen
2005-02-22 17:52 ` Matthew Wilcox
2005-02-22 19:25 ` Andrew Morton
2005-02-22 19:25 ` Andrew Morton
2005-02-22 19:35 ` Dave Hansen
2005-02-22 19:35 ` Dave Hansen
2005-02-22 21:38 ` Jes Sorensen
2005-02-22 21:38 ` Jes Sorensen
2005-02-23 0:48 ` Dave Hansen [this message]
2005-02-23 0:48 ` Dave Hansen
2005-02-22 21:34 ` Jes Sorensen
2005-02-22 21:34 ` Jes Sorensen
2005-02-22 22:39 ` Jes Sorensen
2005-02-22 22:39 ` Jes Sorensen
2005-02-22 23:34 ` Andrew Morton
2005-02-22 23:34 ` Andrew Morton
2005-02-23 10:01 ` Jes Sorensen
2005-02-23 10:01 ` Jes Sorensen
2005-02-23 22:34 ` Christoph Hellwig
2005-02-24 16:11 ` Jes Sorensen
2005-02-24 16:11 ` Jes Sorensen
2005-03-10 6:55 ` Andrew Morton
2005-03-10 6:55 ` Andrew Morton
2005-03-10 13:49 ` Jes Sorensen
2005-03-10 13:49 ` Jes Sorensen
2005-02-22 18:05 ` Luck, Tony
2005-02-22 18:05 ` Luck, Tony
2005-02-22 22:03 ` Arjan van de Ven
2005-02-22 22:03 ` Arjan van de Ven
2005-02-22 22:30 ` Jes Sorensen
2005-02-22 22:30 ` Jes Sorensen
2005-02-22 22:42 ` Arjan van de Ven
2005-02-22 22:42 ` Arjan van de Ven
2005-02-23 8:12 ` Jes Sorensen
2005-02-23 8:12 ` Jes Sorensen
2005-02-23 8:24 ` Arjan van de Ven
2005-02-23 8:24 ` Arjan van de Ven
2005-03-03 11:37 ` Andrew Morton
2005-03-03 11:37 ` Andrew Morton
2005-03-03 12:53 ` Jes Sorensen
2005-03-03 12:53 ` Jes Sorensen
2005-03-04 12:26 ` Jes Sorensen
2005-03-04 12:26 ` Jes Sorensen
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