From patchwork Thu Apr 25 11:05:22 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tzvetomir Stoyanov X-Patchwork-Id: 10916789 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 4B987161F for ; Thu, 25 Apr 2019 11:05:37 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 31E7328C38 for ; Thu, 25 Apr 2019 11:05:37 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 256EB28C3E; Thu, 25 Apr 2019 11:05:37 +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 92F5F28C38 for ; Thu, 25 Apr 2019 11:05:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730649AbfDYLFg (ORCPT ); Thu, 25 Apr 2019 07:05:36 -0400 Received: from mail-wm1-f67.google.com ([209.85.128.67]:35809 "EHLO mail-wm1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725955AbfDYLFf (ORCPT ); Thu, 25 Apr 2019 07:05:35 -0400 Received: by mail-wm1-f67.google.com with SMTP id y197so9960682wmd.0 for ; Thu, 25 Apr 2019 04:05:34 -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=iPHqSJk0mCsflYXaRZglV6ohsKBomWWFJDJ6SQ29Gjo=; b=OOexy7eOKfH7aixw4JsND2V1L2H2E6s4HYbD0BQZLwPh9wTGxcWdnVlxtJmRUNBhbL O+lQtNM99ThRUuKuIRAzYc5RNHKUfioY+FW6ITMLqwOyJWBR7gAjf/8TfDs/fJgJZyel 1ALn6aqH7nuxoMlpfNzpiX51xhTLh1aeQMWQ8OnzaT+tcJc5v9dV9K9pzlCqsXnMjzGX 3dV29AwrU0k5bm4HqVujT2FJl7DFU2dE9xvD5SiVQgVe6fH8xmTf9D/PEsqqbinMJa+B Bu7oL0r+YpTQ9daZIkXhLwuioplnl2ZUBDG+V7WGrKQvPRuI/5MOuInssmeYmCRRNIOO LBOw== X-Gm-Message-State: APjAAAUQ5qRcCxLf7s9beMLit6DULjX4sP2q0h7Gw+HlUUqAaynZG0F+ q8uiu0WLy1fTkeYJtEb21nIwBgVN X-Google-Smtp-Source: APXvYqxRPkCNkH1JmvGmqcOeQ2V5ZjVYgXSYYCd1H4tx5L35rZgQ+UjerLnl/3HDNI3uS/mlnjgFww== X-Received: by 2002:a1c:b189:: with SMTP id a131mr3010937wmf.107.1556190333557; Thu, 25 Apr 2019 04:05:33 -0700 (PDT) Received: from oberon.eng.vmware.com ([146.247.46.5]) by smtp.gmail.com with ESMTPSA id a6sm23013606wrp.49.2019.04.25.04.05.32 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 25 Apr 2019 04:05:32 -0700 (PDT) From: Tzvetomir Stoyanov To: rostedt@goodmis.org Cc: linux-trace-devel@vger.kernel.org Subject: [PATCH v11 0/9] trace-cmd: Timetamps sync between host and guest machines, relying on vsock events. Date: Thu, 25 Apr 2019 14:05:22 +0300 Message-Id: <20190425110531.8941-1-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 [ v11 changes: - Rebased on top of Slavomir's v10 "Add VM kernel tracing over vsockets and FIFOs" - Addressed Slavomir's commnents from version 10 of the patch series. v10 changes: - Fixed broken compilation, call to timestamp_correction_calc() in timestamp_correct was smashed. - Replaced deprecated tep_data_event_from_type() API with tep_find_event(). - Fixed a warning on assignment const to non const. v9 changes: - Fixed implementation of binary search algorithm in timestamp_correct() v8 changes: - Added rmdir() call in tracecmd_remove_instance(), to completely remove the instance. However, there is an issue with deleting the instances using rmdir(), which is investigated. - Few changes in read_qemu_guests_pids(), timestamp_correct(), tsync_offset_load() tracecmd_clock_context_new() and find_raw_events() suggested by Slavomir. v7 changes: - Added warning messages in case time synchronization cannot be negotiated or fails. - Few optimizations and checks in read_qemu_guests_pids(), tsync_offset_load(), and find_raw_events(), suggested by Slavomir Kaslev. - Reworked timestamp_correct() to not use static variables. - Check TRACECMD_OPTION_TIME_SHIFT before reading time sync samples from the trace.dat file 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. ] POC implementation of algorithm 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 v10 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 | 145 +++++- lib/trace-cmd/trace-util.c | 98 ++-- tracecmd/Makefile | 1 + tracecmd/include/trace-local.h | 43 +- tracecmd/include/trace-msg.h | 10 + tracecmd/trace-agent.c | 13 +- tracecmd/trace-msg.c | 209 +++++++- tracecmd/trace-output.c | 117 ++++- tracecmd/trace-read.c | 4 +- tracecmd/trace-record.c | 229 +++++++-- tracecmd/trace-timesync.c | 808 +++++++++++++++++++++++++++++++ 13 files changed, 1575 insertions(+), 134 deletions(-) create mode 100644 tracecmd/trace-timesync.c