From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932084AbVHROSb (ORCPT ); Thu, 18 Aug 2005 10:18:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750849AbVHROSb (ORCPT ); Thu, 18 Aug 2005 10:18:31 -0400 Received: from ms-smtp-03.nyroc.rr.com ([24.24.2.57]:15866 "EHLO ms-smtp-03.nyroc.rr.com") by vger.kernel.org with ESMTP id S1750823AbVHROSa (ORCPT ); Thu, 18 Aug 2005 10:18:30 -0400 Subject: Re: [PATCH] Fix mmap_kmem (was: [question] What's the difference between /dev/kmem and /dev/mem) From: Steven Rostedt To: Arjan van de Ven Cc: "Martin J. Bligh" , Linus Torvalds , LKML , Andrew Morton In-Reply-To: <1124374025.3220.14.camel@laptopd505.fenrus.org> References: <1123796188.17269.127.camel@localhost.localdomain> <1123809302.17269.139.camel@localhost.localdomain> <1123951810.3187.20.camel@laptopd505.fenrus.org> <130440000.1124031022@[10.10.2.4]> <1124374025.3220.14.camel@laptopd505.fenrus.org> Content-Type: text/plain Organization: Kihon Technologies Date: Thu, 18 Aug 2005 10:18:10 -0400 Message-Id: <1124374690.5186.39.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2005-08-18 at 16:07 +0200, Arjan van de Ven wrote: > > Whilst there's no normal legitimite usage for it, it is useful for debugging. > > One thing I often do is create a circular log buffer, then fish it back > > out by mmaping /dev/mem or /dev/kmem, and going by system.map offsets. > > No, nobody could claim it was clean or elegant, but it *is* useful. > > relayfs. It's still not in the vanilla kernel. Besides, mapping kmem is more fun :-) -- Steve