Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755105AbYJZNtf (ORCPT ); Sun, 26 Oct 2008 09:49:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753404AbYJZNt0 (ORCPT ); Sun, 26 Oct 2008 09:49:26 -0400 Received: from mx2.redhat.com ([66.187.237.31]:47571 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753096AbYJZNtZ (ORCPT ); Sun, 26 Oct 2008 09:49:25 -0400 Date: Sun, 26 Oct 2008 09:49:05 -0400 From: "Frank Ch. Eigler" To: =?iso-8859-1?B?VPZy9ms=?= Edwin Cc: Peter Zijlstra , fweisbec@gmail.com, mingo@elte.hu, srostedt@redhat.com, sandmann@daimi.au.dk, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/4] Add support for userspace stacktraces in tracing/iter_ctrl Message-ID: <20081026134904.GG8210@redhat.com> References: <1223817124-27239-1-git-send-email-edwintorok@gmail.com> <1223817124-27239-3-git-send-email-edwintorok@gmail.com> <1225027782.32713.10.camel@twins> <490472E5.2070207@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <490472E5.2070207@gmail.com> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 698 Lines: 18 Hi - On Sun, Oct 26, 2008 at 03:38:45PM +0200, T?r?k Edwin wrote: > [...] In userspace I can get a stacktrace using DWARF unwind info, > but doing that in the kernel would be too expensive, right? [...] We're experimenting with just that in systemtap. The expenses (memory: megabytes of unwind data, time: running code to process it) would be paid only for the duration of a systemtap script that needs that particular sort of information. - FChE -- 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/