From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4CDB2C433FE for ; Thu, 20 Oct 2022 15:14:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229757AbiJTPOm (ORCPT ); Thu, 20 Oct 2022 11:14:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47078 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229792AbiJTPOl (ORCPT ); Thu, 20 Oct 2022 11:14:41 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CBB4F2CDE7; Thu, 20 Oct 2022 08:14:38 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 83128B8279A; Thu, 20 Oct 2022 15:14:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 87859C433D7; Thu, 20 Oct 2022 15:14:35 +0000 (UTC) Date: Thu, 20 Oct 2022 11:14:39 -0400 From: Steven Rostedt To: richard clark Cc: bristot@kernel.org, linux-trace-devel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: Question about 'for_each_kernel_tracepoint(...)' function Message-ID: <20221020111439.76e72230@gandalf.local.home> In-Reply-To: References: X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org On Thu, 20 Oct 2022 17:32:57 +0800 richard clark wrote: > Hi, > Can this function only find the trace points defined in the kernel It should find all tracepoints. > image? I want to define a trace event in my kernel module A, then B > module to register a probe callback function for that event TP in A. I > want to kick off a timer in A and call the traced function > periodically, thus I can monitor the events happening in A from B. You could also export the tracepoint from A and reference it directly in B. > > Can I do that, is it possible? > Try it and find out. Why ask? -- Steve