From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Hansen Date: Wed, 23 Feb 2005 00:48:44 +0000 Subject: Re: [patch -mm series] ia64 specific /dev/mem handlers Message-Id: <1109119724.7277.25.camel@localhost> List-Id: References: <16923.193.128608.607599@jaguar.mkp.net> <20050222020309.4289504c.akpm@osdl.org> <20050222175225.GK28741@parcelfarce.linux.theplanet.co.uk> <20050222112513.4162860d.akpm@osdl.org> <1109100938.25666.44.camel@localhost> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Jes Sorensen Cc: Andrew Morton , Matthew Wilcox , linux-ia64@vger.kernel.org, Linux Kernel Mailing List On Tue, 2005-02-22 at 16:38 -0500, Jes Sorensen wrote: > >>>>> "Dave" = Dave Hansen 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