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 X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 09321C43333 for ; Thu, 14 Jan 2021 02:11:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BD245235F8 for ; Thu, 14 Jan 2021 02:11:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729281AbhAMWQn (ORCPT ); Wed, 13 Jan 2021 17:16:43 -0500 Received: from mail.kernel.org ([198.145.29.99]:43142 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729205AbhAMWOj (ORCPT ); Wed, 13 Jan 2021 17:14:39 -0500 Received: from gandalf.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A1B5F23136; Wed, 13 Jan 2021 22:13:48 +0000 (UTC) Date: Wed, 13 Jan 2021 17:13:47 -0500 From: Steven Rostedt To: "Tzvetomir Stoyanov (VMware)" Cc: linux-trace-devel@vger.kernel.org Subject: Re: [PATCH 5/6] trace-cmd library man pages: Manage trace session with multiple trace peers. Message-ID: <20210113171347.1e75f7a6@gandalf.local.home> In-Reply-To: <20201223043429.586162-6-tz.stoyanov@gmail.com> References: <20201223043429.586162-1-tz.stoyanov@gmail.com> <20201223043429.586162-6-tz.stoyanov@gmail.com> 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 I'm assuming that you can pair multiple guests with a single host? That is, can we have: bool g1 = false, g2 = false; host = tracecmd_open_head("trace.dat"); tracecmd_init_data(host); guest1 = tracecmd_open_head("trace-Guest-1.dat"); guest2 = tracecmd_open_head("trace-Guest-2.dat"); guest_id_1 = tracecmd_get_traceid(guest1); guest_id_2 = tracecmd_get_traceid(guest1); if (!tracecmd_get_guest_cpumap(host, guest_id_1, &name1, &vcount1, &cpu_pids1) g1 = !tracecmd_init_data(guest1); if (!tracecmd_get_guest_cpumap(host, guest_id_2, &name2, &vcount2, &cpu_pids2) g2 = !tracecmd_init_data(guest2); if (g1) { int i; for (i = 0; i < vcount1; i++) { printf("Host task id %d maps to guest %s cpu %d\n", cpu_pids1[i], name1, i); } tracecmd_unpair_peer(guest1); } if (g2) { int i; for (i = 0; i < vcount2; i++) { printf("Host task id %d maps to guest %s cpu %d\n", cpu_pids2[i], name2, i); } tracecmd_unpair_peer(guest2); } And use something like the above for the example? -- Steve On Wed, 23 Dec 2020 06:34:28 +0200 "Tzvetomir Stoyanov (VMware)" wrote: > +EXAMPLE > +------- > +[source,c] > +-- > +#include > +... > +struct tracecmd_input *host = tracecmd_open_head("trace.dat"); > + if (!host) { > + /* Failed to open host trace file */ > + } > + tracecmd_init_data(host); > + > +struct tracecmd_input *guest = tracecmd_open_head("trace-Guest.dat"); > + if (!guest) { > + /* Failed to open guest trace file */ > + } > + > +unsigned long long guest_id = tracecmd_get_traceid(guest); > +int *cpu_pid; > +char *name; > +int vcount; > + > + if (!tracecmd_get_guest_cpumap(host, guest_id, &name, &vcount, &cpu_pid)) { > + /* The Host and a guest with name was part of the same trace session. > + * Got guest VCPU to host PID mapping. > + */ > + if (!tracecmd_pair_peer(guest, host)) { > + /* Successfully paired host to the guest handler */ > + tracecmd_init_data(guest); > + ... > + tracecmd_unpair_peer(guest); > + } > + } > + > +... > + tracecmd_close(guest); > + tracecmd_close(hadle); > + > +--