From patchwork Fri Mar 15 08:37:45 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tzvetomir Stoyanov X-Patchwork-Id: 10854273 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C2B681669 for ; Fri, 15 Mar 2019 08:37:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AC1F42A88D for ; Fri, 15 Mar 2019 08:37:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9FC462A8BA; Fri, 15 Mar 2019 08:37:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3A0612A88D for ; Fri, 15 Mar 2019 08:37:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727243AbfCOIh6 (ORCPT ); Fri, 15 Mar 2019 04:37:58 -0400 Received: from mail-wr1-f68.google.com ([209.85.221.68]:40135 "EHLO mail-wr1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727055AbfCOIh6 (ORCPT ); Fri, 15 Mar 2019 04:37:58 -0400 Received: by mail-wr1-f68.google.com with SMTP id t5so8629908wri.7 for ; Fri, 15 Mar 2019 01:37:57 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=MdDaulp0dmRPFZjb5JUUsqt4YcTFdJLyY+K+uiuNDXU=; b=Gt2+ZoCMlDtMBEujLEPy+LA5aYql/FyEgBi1xmXcveJ00u52z8UE4Z9I4bNbqcMC/v KWXiUb5SCvHh28FfhufVRmPOfl4ugJ2Am3y5YURB1RduILJIF9sGsfl4WwomSRQbBNUs fs8txm7EagV2ivUhQeYus6dZn1R8nyqOyO6zU0M189i0WOEEA0eH708exaR/sKzoagNN lMTURBbRsuq6EAFaVbuJlYNRv6ahHMeumGl1TiLbAX0MOyVL8Qcw4mljN2znEQtthzT2 3xPA2h19UhNLrrx8dUvfjZKjPw8oJO5hVJ5OmotP0GvbPl+iGokRhaXaACplCvFmeflj /RxA== X-Gm-Message-State: APjAAAWqf8KtQNMaFvTJGSNy3K2rS+A7urZGPULs1eKO8xVM1Lin9X0Y VEHoHmvC+pDyFIzc7hEOsFMIBq8s X-Google-Smtp-Source: APXvYqxWfFvqkTPfgLU9o9OAVwsN46iUO2YJT4+dl1fPk/kQnh9yZp3qg2aKEQkt5tENDEJHzj9M0w== X-Received: by 2002:adf:ed48:: with SMTP id u8mr1629767wro.185.1552639076562; Fri, 15 Mar 2019 01:37:56 -0700 (PDT) Received: from oberon.eng.vmware.com ([146.247.46.5]) by smtp.gmail.com with ESMTPSA id o5sm979395wmh.12.2019.03.15.01.37.55 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 15 Mar 2019 01:37:55 -0700 (PDT) From: Tzvetomir Stoyanov To: rostedt@goodmis.org Cc: linux-trace-devel@vger.kernel.org Subject: [PATCH v6 0/9][POC] trace-cmd: Timetamps sync between host and guest machines, relying on vsock events. Date: Fri, 15 Mar 2019 10:37:45 +0200 Message-Id: <20190315083754.27532-1-tstoyanov@vmware.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Sender: linux-trace-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP [ V6 changes: - Refactored tracecmd_msg_snd_time_sync() and tracecmd_msg_rcv_time_sync() functions: removed any time sync calculations logic as separate functions in trace-timesync.c file - Defined TSYNC_PROBE, TSYNC_REQ and TSYNC_RESP messages, in order to make the time sync protocol comprehensible. - Addressed Steven Rostedt comments. - Addressed Slavomir Kaslev commnets. V5 changes: - Rebased to Slavomir's v8 "Add VM kernel tracing over vsockets and FIFOs" patch series. - Implemented an algorithm for time drift correction. - Addressed Slavomir's commnets. - Refactored the code: moved all time sync specific implementation in trace-timesync.c - Isolated all hardcoded event specific stuff in a structure, so it could be easily moved to external plugins. - Added a check for VSOCK support: do not perform vsock dependent time synchronisation in case there is no VSOCK support. V4 changes: - Removed the implementation of PTP-like algorithm. The current logic relies on matching time stamps of kvm_exit/virtio_transport_recv_pkt events on host to virtio_transport_alloc_pkt/vp_notify events on guest. - Rebased to Slavomir's v7 "Add VM kernel tracing over vsockets and FIFOs" patch series. - Decreased the time synch probes from 5000 to 300. - Addressed Steven Rostedt comments. - Code cleanup. V3 changes: - Removed any magic constants, used in the PTP-like algorithm, as Slavomir Kaslev suggested. - Implemented new algorithm, based on mapping kvm_exit events in host context to vsock_send events in guest context, suggested by Steven Rostedt. V2 changes: - Addressed Steven Rostedt comments. - Modified PTP-like timestamps sync algorithm to gain more accuracy, with the help of Yordan Karadzhov and Slavomir Kaslev. ] This patch series is a POC for timestamps sync between guest and host machines. The algorithm relies on matching time stamps of guest and host vsock events. The patch series depends on Slavomir's changes, introduced by the v8 patch series "Add VM kernel tracing over vsockets and FIFOs" Tzvetomir Stoyanov (9): trace-cmd: Implemented new lib API: tracecmd_local_events_system() trace-cmd: Added support for negative time offsets in trace.dat file trace-cmd: Fix tracecmd_read_page_record() to read more than one event trace-cmd: Added implementation of htonll() and ntohll() trace-cmd: Refactored few functions in trace-record.c trace-cmd: Find and store pids of tasks, which run virtual CPUs of given VM trace-cmd: Implemented new API tracecmd_add_option_v() trace-cmd: Implemented new option in trace.dat file: TRACECMD_OPTION_TIME_SHIFT trace-cmd [POC]: Implemented timestamps synch algorithm, using vsock events. include/trace-cmd/trace-cmd.h | 31 +- include/traceevent/event-parse.h | 1 + lib/trace-cmd/trace-input.c | 137 ++++- lib/trace-cmd/trace-util.c | 95 ++-- tracecmd/Makefile | 1 + tracecmd/include/trace-local.h | 43 +- tracecmd/include/trace-msg.h | 10 + tracecmd/trace-agent.c | 10 +- tracecmd/trace-msg.c | 209 +++++++- tracecmd/trace-output.c | 117 ++++- tracecmd/trace-read.c | 4 +- tracecmd/trace-record.c | 220 +++++++-- tracecmd/trace-timesync.c | 824 +++++++++++++++++++++++++++++++ 13 files changed, 1570 insertions(+), 132 deletions(-) create mode 100644 tracecmd/trace-timesync.c