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=-0.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 02B0CC433DF for ; Fri, 26 Jun 2020 16:28:10 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C3FF620791 for ; Fri, 26 Jun 2020 16:28:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Q+ZtfCEb" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C3FF620791 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:50654 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jorCz-0004Ul-0U for qemu-devel@archiver.kernel.org; Fri, 26 Jun 2020 12:28:09 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:53816) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jorCC-0003XS-BA for qemu-devel@nongnu.org; Fri, 26 Jun 2020 12:27:20 -0400 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:35136 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jorC9-0002xT-Rq for qemu-devel@nongnu.org; Fri, 26 Jun 2020 12:27:19 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1593188835; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=BdszDYFtdtc+CvOS8OsCmXauBVhbE0tlpQzVr7wTTZ8=; b=Q+ZtfCEb3q5oyBEgOjk6jqCDUkIbBAM3Z3mHN4pnVfFgLpH+gNXlpmbyAlaKaeXVF3sw7H 2mJs8eHXYl3KpKQEx1nWdKd0mnYYT8dxH07odI0GzEfctvJ+gOUgxJzzCpsLH0S3F4o4jH HC7/Y9zBuiTCalupBSG6ZLgZNmnxmDA= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-386--5r2PmB7Oiq1l8_VIm6jVA-1; Fri, 26 Jun 2020 12:27:13 -0400 X-MC-Unique: -5r2PmB7Oiq1l8_VIm6jVA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E0A4F800C60; Fri, 26 Jun 2020 16:27:12 +0000 (UTC) Received: from turbo.com (ovpn-112-91.ams2.redhat.com [10.36.112.91]) by smtp.corp.redhat.com (Postfix) with ESMTP id E7E8879305; Fri, 26 Jun 2020 16:27:07 +0000 (UTC) From: Christophe de Dinechin To: qemu-devel@nongnu.org Subject: [PATCH v2 0/3] trace: Add a trace backend for the recorder library Date: Fri, 26 Jun 2020 18:27:03 +0200 Message-Id: <20200626162706.3304357-1-dinechin@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass client-ip=205.139.110.61; envelope-from=dinechin@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/26 02:19:36 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Markus Armbruster , Michael Tokarev , "Dr. David Alan Gilbert" , Stefan Hajnoczi , Laurent Vivier Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The recorder library implements low-cost always-on tracing, with three=0D usage models:=0D =0D 1. Flight recorder: Dump information on recent events in case of crash=0D 2. Tracing: Individual traces can be enabled using environment variables=0D 3. Real-time graphing / control, using the recorder_scope application=0D =0D This short series introduces a new "recorder" back-end which connects=0D to the recorder. Traces using the recorder are intentionally "always on".= =0D An example is given of how the recorder can also be used separately=0D from generated traces. This can be useful if you want to enable=0D multiple related traces for a particular topic.=0D =0D This series requires a small makefile fix submitted earlier, included=0D here for convenience.=0D =0D Christophe de Dinechin (3):=0D Makefile: Compute libraries for libqemuutil.a and libvhost-user.a=0D trace: Add support for recorder back-end=0D trace: Example of "centralized" recorder tracing=0D =0D Makefile | 2 ++=0D configure | 5 +++=0D hmp-commands.hx | 19 ++++++++--=0D monitor/misc.c | 27 ++++++++++++++=0D scripts/tracetool/backend/recorder.py | 51 +++++++++++++++++++++++++++=0D trace/Makefile.objs | 2 ++=0D trace/control.c | 7 ++++=0D trace/recorder.c | 22 ++++++++++++=0D trace/recorder.h | 34 ++++++++++++++++++=0D util/module.c | 8 +++++=0D util/qemu-thread-common.h | 7 ++++=0D 11 files changed, 182 insertions(+), 2 deletions(-)=0D create mode 100644 scripts/tracetool/backend/recorder.py=0D create mode 100644 trace/recorder.c=0D create mode 100644 trace/recorder.h=0D =0D --=20=0D 2.26.2=0D =0D