Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 30 Oct 2000 13:12:24 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 30 Oct 2000 13:12:14 -0500 Received: from panic.ohr.gatech.edu ([130.207.47.194]:38149 "EHLO havoc.gtf.org") by vger.kernel.org with ESMTP id ; Mon, 30 Oct 2000 13:12:02 -0500 Message-ID: <39FDB9A7.154B385F@mandrakesoft.com> Date: Mon, 30 Oct 2000 13:10:47 -0500 From: Jeff Garzik Organization: MandrakeSoft X-Mailer: Mozilla 4.75 [en] (X11; U; Linux 2.4.0-test10 i686) X-Accept-Language: en MIME-Version: 1.0 To: root@chaos.analogic.com CC: John Levon , Linux kernel Subject: Re: kmalloc() allocation. In-Reply-To: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org "Richard B. Johnson" wrote: > > On Mon, 30 Oct 2000, Jeff Garzik wrote: > > > "Richard B. Johnson" wrote: > > > Now, I could set up a linked-list of buffers and use vmalloc() > > > if the buffers were allocated from non-paged RAM. I don't think > > > they are. These buffers must be present during an interrupt. > > > > Non-paged RAM? I'm not sure what you mean by that. > > > > Both kmalloc and vmalloc allocate pages, but neither will allocate pages > > that the system will swap out (page out). [vk]malloc pages are always > > around during an interrupt. > > > > Jeff > > Hmm, vmalloc() doesn't seem to have the size limitation. Are you sure > that it's present during an interrupt? I can't page-fault during the > interrupt. vmalloc'd memory does have a size limitation, though it's larger than kmalloc's limit. AFAIK vmalloc'd memory is a collection of pages remapping in the page tables to be virtually contiguous, implying that it is present during an interrupt. -- Jeff Garzik | "Mind if I drive?" -Sam Building 1024 | "Not if you don't mind me clawing at the MandrakeSoft | dash and shrieking like a cheerleader." | -Max - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/