Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750872AbWAOW1G (ORCPT ); Sun, 15 Jan 2006 17:27:06 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750941AbWAOW1G (ORCPT ); Sun, 15 Jan 2006 17:27:06 -0500 Received: from ms-smtp-04-smtplb.tampabay.rr.com ([65.32.5.134]:33476 "EHLO ms-smtp-04.tampabay.rr.com") by vger.kernel.org with ESMTP id S1750872AbWAOW1F (ORCPT ); Sun, 15 Jan 2006 17:27:05 -0500 Message-ID: <43CACC34.504@cfl.rr.com> Date: Sun, 15 Jan 2006 17:27:00 -0500 From: Phillip Susi User-Agent: Mozilla Thunderbird 1.0.7 (X11/20051010) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Peter Osterlund CC: linux kernel , axboe@suse.de Subject: Re: [PATCH] pktcdvd & udf bugfixes References: <43C5D71B.1060002@cfl.rr.com> <43C94464.4040500@cfl.rr.com> <43C982C0.1070605@cfl.rr.com> <43CA89A4.3010000@cfl.rr.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 944 Lines: 26 Surely the kernel can allocate pagable memory if it chooses to? I think in the case of pktcdvd it would be best for the buffers to be pagable when initially allocated and filled, and only locked into memory when the bio is sent down to the cdrom driver. That way you could keep a fairly large number of buffers on larger ( 256 KB+ ) packets in memory for write combining, without placing undue burden on non paged pool. Peter Osterlund wrote: >>Ahh, excellent. Also, is the memory currently non pagable? Is there >>a reason for that? >> >> > >Yes the memory is non pagable. The linux kernel doesn't support >pagable kernel memory, only user space memory can be swapped out. > > > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/