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 B6BC9C433E0 for ; Fri, 3 Jul 2020 10:38:00 +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 7CF54206DF for ; Fri, 3 Jul 2020 10:38:00 +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="EDHPYJcs" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7CF54206DF 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]:45772 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jrJ4x-0001Ut-PK for qemu-devel@archiver.kernel.org; Fri, 03 Jul 2020 06:37:59 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:35936) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jrJ4F-0000Ra-Ua for qemu-devel@nongnu.org; Fri, 03 Jul 2020 06:37:15 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:53400 helo=us-smtp-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 1jrJ4C-00054k-Ve for qemu-devel@nongnu.org; Fri, 03 Jul 2020 06:37:15 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1593772631; 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: in-reply-to:in-reply-to:references:references; bh=WLy6J0rR87x/UaIr12oNWogdPYYi4gz/HBto258uaTI=; b=EDHPYJcscn68sMic+c2jGjP5NQ+mlqjBokpyjxCwQAklyK8slogkh1Vz78oiWVULLx47nR /5Dgdnf7qTxR5kwlEE9xT6Z52oviC2PTFNx6V6jyLYpXpePV9x+TMcqXY4zhjAz25N1jKm n0b3UchUQOdX8SR9Rhv0QK4mGHxrjDI= 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-466-ROnTtFQCNKWBtcb1xZTNUQ-1; Fri, 03 Jul 2020 06:37:10 -0400 X-MC-Unique: ROnTtFQCNKWBtcb1xZTNUQ-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E933287950E; Fri, 3 Jul 2020 10:37:08 +0000 (UTC) Received: from titinator (ovpn-113-254.ams2.redhat.com [10.36.113.254]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 31A306FEF4; Fri, 3 Jul 2020 10:37:04 +0000 (UTC) References: <20200626162706.3304357-1-dinechin@redhat.com> <20200630125916.GG91444@stefanha-x1.localdomain> User-agent: mu4e 1.5.2; emacs 26.3 From: Christophe de Dinechin To: Stefan Hajnoczi Subject: Re: [PATCH v2 0/3] trace: Add a trace backend for the recorder library In-reply-to: <20200630125916.GG91444@stefanha-x1.localdomain> Date: Fri, 03 Jul 2020 12:37:02 +0200 Message-ID: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dinechin@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain Received-SPF: pass client-ip=205.139.110.120; envelope-from=dinechin@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/03 03:38:32 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 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: Laurent Vivier , Michael Tokarev , qemu-devel@nongnu.org, Markus Armbruster , "Dr. David Alan Gilbert" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 2020-06-30 at 14:59 CEST, Stefan Hajnoczi wrote... > On Fri, Jun 26, 2020 at 06:27:03PM +0200, Christophe de Dinechin wrote: >> The recorder library implements low-cost always-on tracing, with three >> usage models: >> >> 1. Flight recorder: Dump information on recent events in case of crash >> 2. Tracing: Individual traces can be enabled using environment variables >> 3. Real-time graphing / control, using the recorder_scope application >> >> This short series introduces a new "recorder" back-end which connects >> to the recorder. Traces using the recorder are intentionally "always on". >> An example is given of how the recorder can also be used separately >> from generated traces. This can be useful if you want to enable >> multiple related traces for a particular topic. >> >> This series requires a small makefile fix submitted earlier, included >> here for convenience. >> >> Christophe de Dinechin (3): >> Makefile: Compute libraries for libqemuutil.a and libvhost-user.a >> trace: Add support for recorder back-end >> trace: Example of "centralized" recorder tracing > > Please add a build to .travis.yml that enables recorder. That way we'll > catch build failures. There is no recorder package in Xenial. > > Thanks, > Stefan -- Cheers, Christophe de Dinechin (IRC c3d)