From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from simark.ca by simark.ca with LMTP id HoXaDbvZUmhRahMAWB0awg (envelope-from ) for ; Wed, 18 Jun 2025 11:22:35 -0400 Authentication-Results: simark.ca; dkim=pass (2048-bit key; unprotected) header.d=lists.lttng.org header.i=@lists.lttng.org header.a=rsa-sha256 header.s=default header.b=TgtcYl/b; dkim-atps=neutral Received: by simark.ca (Postfix, from userid 112) id 2A2641E11C; Wed, 18 Jun 2025 11:22:35 -0400 (EDT) X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-25) on simark.ca X-Spam-Level: X-Spam-Status: No, score=-6.5 required=5.0 tests=ARC_SIGNED,ARC_VALID,BAYES_00, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FREEMAIL_REPLYTO_END_DIGIT, MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE,RCVD_IN_VALIDITY_CERTIFIED, RCVD_IN_VALIDITY_RPBL,RCVD_IN_VALIDITY_SAFE autolearn=ham autolearn_force=no version=4.0.1 Received: from lists.lttng.org (lists.lttng.org [158.69.130.29]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by simark.ca (Postfix) with ESMTPS id 019C01E089 for ; Wed, 18 Jun 2025 11:22:33 -0400 (EDT) ARC-Filter: OpenARC Filter v1.2.1 lists.lttng.org 4bMnY51dNsz2GBX ARC-Seal: i=1; d=lists.lttng.org; s=arc1; a=rsa-sha256; cv=none; t=1750260153; b=m1cos/rmNb15v+fgsKFttc7+W3EFUHLazUVy8V8yI1QOYkgNhUSddJkrKxhSkv6A9qwr rKsNfm7uQPBf91vMTMUZoEe+tDXWCSUWeIHJ6s0qmDVleXUwjziUC2a+YtXqFkAFQ7AJ7 jB4MUkpwngiQ61zMKyqKbdso1uRS6zLy1pDg6Aqp88sNrMRRJCCeja1MJ+5ZWXBk+CpWY XXF1j1UIikruVC9Dgj894eOEBy8PtUqCtnsB+JmC/4pxEuN07PUCMkEKaLPr8UoN4+wYL R1vJG2SIm4+WKgl1bQQNIUUqDf34exWSp8sg8zy09FGXUGAs8bMiMfTdb+mzBLz3TdQ== ARC-Message-Signature: i=1; d=lists.lttng.org; s=arc1; a=rsa-sha256; c=relaxed/simple; t=1750260153; h=DKIM-Signature:MIME-Version:Date:Message-ID:Subject:To:From:From; bh=NjVZFGkNRWFWNf4crq9XKZFITwPvwVoDSVXOFvSyGZs=; b=HvtQBBCTAMEJCoxeBgyC14ZJ4YpNyGG15Etafbx9gexF+zUb97Hn6SYQVz8Y5+1pUqFD D5eXiJx2EQ43IDn9kiOdYZi6Vd1j1IVQRtzw+KpRgUMVv4xQ/wiAeUJN80QNJPyZ1h0yU oBuL4lrusL1xLyzpamIswMAsBLsCalviTtAZeLvvwSRMsu73ZDCBESMeJ9b6erQ39Cygq ljKMt35gKFTcQi3XRpD7ac/sRpUxWWAxl82lKDn52O0p8xpMOmqQr+oSZ84AuR54uNO/C iW3hLmeuh9Fal+F/YcqG82oRvEO69ccOrB2Wau8gyx6mQJP99Ay7Gghkry4K+WsU7lQ== ARC-Authentication-Results: i=1; lists.lttng.org; arc=none smtp.remote-ip="::1" DKIM-Filter: OpenDKIM Filter v2.11.0 lists.lttng.org 4bMnY51dNsz2GBX DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=lists.lttng.org; s=default; t=1750260153; bh=NjVZFGkNRWFWNf4crq9XKZFITwPvwVoDSVXOFvSyGZs=; h=Date:Subject:To:List-Id:List-Unsubscribe:List-Archive:List-Post: List-Help:List-Subscribe:From:Reply-To:From; b=TgtcYl/bZChQYi6QXkkJdPxZl957wRZjOngeybYDIw9kFPGtby8nbNqet9mB7/Qo0 OVUFh0sCk7IS/uFJmtZaxuUs2K4McaxrOCLJXu9gMReI8lm6xxprghTIrVvddrFGBS X/bLzJ38S3kvINWGBI+KZEgLpAnU6HDZqd8WgCcItGBLPLkWbknBYc4xXe8Tu8fGQ4 i9LJbXgAUCkjeftSq54BHglzpBvm97kxWBj6mQEx+U+a0PvYOhE0YSb8bjz2tWxD2h yzVJr3u43tqr/EIlJgHOqwldlaVSl0UIZ6dDyqyaXRNhpF0yLBiPQIzkIdTygdD5tY XW9VR+y/oS0iQ== Received: from lists-lttng01.efficios.com (localhost [IPv6:::1]) by lists.lttng.org (Postfix) with ESMTP id 4bMnY51dNsz2GBX; Wed, 18 Jun 2025 11:22:32 -0400 (EDT) ARC-Filter: OpenARC Filter v1.2.1 lists.lttng.org 4bMnY36cDPz2G7m DKIM-Filter: OpenDKIM Filter v2.11.0 lists.lttng.org 4bMnY36cDPz2G7m Received: from mail-lj1-x236.google.com (mail-lj1-x236.google.com [IPv6:2a00:1450:4864:20::236]) by lists.lttng.org (Postfix) with ESMTPS id 4bMnY36cDPz2G7m for ; Wed, 18 Jun 2025 11:22:31 -0400 (EDT) Received: by mail-lj1-x236.google.com with SMTP id 38308e7fff4ca-32b7cf56cacso7774721fa.1 for ; Wed, 18 Jun 2025 08:22:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1750260149; x=1750864949; h=to:subject:message-id:date:from:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=NjVZFGkNRWFWNf4crq9XKZFITwPvwVoDSVXOFvSyGZs=; b=RwqLdYgrh9CfDk3OGqhR2Njlao5+ZKDIW4Ly9010p/Xxo90ZFyxPbzA+XiyQUQeggB 84S6SKaSDKyvXHfGtBMS8rJnuSdJrBJGrwPLgi89C3RQzI3Qvb6HqIktMQBUPVV1toZm 5WtcNHSN9mEnFu52BWsGybqz6io/+LjwaOUlVadP1aKLuYqTgWOFvw7HLApL7wzolFx1 qrfhGTL0Ba46xCcra2h6dtHFmnFpdnaO+wEBXhoe/xWcsHnfjAlO9sIyRxKoJbBLc5xI mXXIjslWB17dlRN4svBDhGJGXyBzsl6+A8IgaJMJ3X14vrE21sxIONUWYNzNewrGyleV JE1g== X-Gm-Message-State: AOJu0YyvMCVO8qUKNI8i0IF96pX55gn6/J2Lx9ss8HXHJCldHg41SE3S doCDUzeLRH6jzjN6k4R6IvC8yo5QdNgPKEkS/o3ves+fufS+9VVZggyclKZrUdwNBkpXUaiDxEc n93WUmLAOYQOsGImEOZTPIHjNivS2qKJVkgC1 X-Gm-Gg: ASbGncvCxRmbiAKJ6WfRtXl3YJGDjIDkyqIFvHndFrx6gQ0X/DzbXwRKbVFfVDK1rJ8 Fv2YsVCL+i9Piq73754lOUE38x/edI6ajt4WOzaTRLcPr0gmQuHOIfU1ybhyHLYWuO36hW2n+7l rQaBeIoRh/TslX/ljQ1zK0Ga/+z4S7tsQ11ryKISzuzkg= X-Google-Smtp-Source: AGHT+IFlapxdMQBLrUfNexfxXqYFa+OEqWDKhlO1WRr/TNBobkT7lnTLcYSYcQ1yYg8Bd8/UVVlpM/02xdbZgti/ngM= X-Received: by 2002:a05:651c:504:b0:30b:ecfc:78bf with SMTP id 38308e7fff4ca-32b4a300321mr45927851fa.5.1750260148440; Wed, 18 Jun 2025 08:22:28 -0700 (PDT) MIME-Version: 1.0 Date: Wed, 18 Jun 2025 17:22:16 +0200 X-Gm-Features: AX0GCFvN9fB3LFl8FLvNVkc30bOrSyLdAASA4a3I0uEMi8dcKcSSQvK3m90QTDY Message-ID: Subject: Method to get LTTNG-UST version during runtime? To: lttng-dev Content-Type: text/plain; charset="UTF-8" X-BeenThere: lttng-dev@lists.lttng.org X-Mailman-Version: 2.1.39 Precedence: list List-Id: LTTng development list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Norbert Lange via lttng-dev Reply-To: Norbert Lange Errors-To: lttng-dev-bounces@lists.lttng.org Sender: "lttng-dev" Hi, there are some substantial changes in 2.14.0 that afffect how/if tracing is possible. For ex. c246521ddcba1d1d28cfa0482aa500b9122e7264 allows doing more work upfront by calling lttng_ust_init_thread(). With 2.13.x the same code will instead do various syscalls or allocations during the first tracepoints, violating realtime constraints and possible abort the process. I miss an easy method to inspect the Lttng UST Version for checks or workarounds. There is the lttng_ust_loaded variable that could be abused to carry an packed version instead of 1. (Of course that could always cause fallout) Regards, Norbert