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 Received: from lists.lttng.org (lists.lttng.org [167.114.26.123]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A8920C00140 for ; Thu, 18 Aug 2022 19:56:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=lists.lttng.org; s=default; t=1660852595; bh=yTZnsj6ospii6VYjIyI0LFM/X8McK8AGMiw/mEbgIrE=; h=Date:To:Cc:Subject:List-Id:List-Unsubscribe:List-Archive: List-Post:List-Help:List-Subscribe:From:Reply-To:From; b=aIqbJ/8++kPjkOOQNLnkn1tJ5Cy84JR4DH+BzwCiQ/NbZ95z2c8o281stDRXPXRf/ YmI8572OQfhS+ZOBBmL76kqs+SKyPau9GdWuQzIO1HnolVDbzCD2z2CXU5CjraCCH3 9eMduGdAtr4itgHwCKOC1lU8UWKQqHe0VvFiW6CQlRO7epzoMdARNk1DyowKZ9//Ki 6vUh/M5+j5UJ3uSbUXhICYm0HYbW67o+nawSyrwNDEgEDPANqvmpp/GV9HYINwtBvt DySqp65vp264YF74zesJIkh/BsaVDkQs+3Zm1qe79a/dhBJ6bQMd4EEvFPLuwz0LPc UysSWYlZOT3VQ== Received: from lists-lttng01.efficios.com (localhost [IPv6:::1]) by lists.lttng.org (Postfix) with ESMTP id 4M7wcy6Xpgz1J67; Thu, 18 Aug 2022 15:56:34 -0400 (EDT) Received: from mail.efficios.com (mail.efficios.com [167.114.26.124]) by lists.lttng.org (Postfix) with ESMTPS id 4M7wcx2Djqz1JnV for ; Thu, 18 Aug 2022 15:56:33 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mail.efficios.com (Postfix) with ESMTP id E15E33972A3 for ; Thu, 18 Aug 2022 15:56:32 -0400 (EDT) Received: from mail.efficios.com ([127.0.0.1]) by localhost (mail03.efficios.com [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id L4ntQNqvmZyB; Thu, 18 Aug 2022 15:56:32 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mail.efficios.com (Postfix) with ESMTP id 87FDB397487; Thu, 18 Aug 2022 15:56:32 -0400 (EDT) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.efficios.com 87FDB397487 X-Virus-Scanned: amavisd-new at efficios.com Received: from mail.efficios.com ([127.0.0.1]) by localhost (mail03.efficios.com [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id cs9c_tcoBo_Z; Thu, 18 Aug 2022 15:56:32 -0400 (EDT) Received: from mail03.efficios.com (mail03.efficios.com [167.114.26.124]) by mail.efficios.com (Postfix) with ESMTP id 74A8C397043; Thu, 18 Aug 2022 15:56:32 -0400 (EDT) Date: Thu, 18 Aug 2022 15:56:32 -0400 (EDT) To: linux-kernel , lttng-dev , rp Cc: paulmck , Stephen Hemminger , Alan Stern , Lai Jiangshan , lwn Message-ID: <927024516.15730.1660852592448.JavaMail.zimbra@efficios.com> MIME-Version: 1.0 X-Originating-IP: [167.114.26.124] X-Mailer: Zimbra 8.8.15_GA_4372 (ZimbraWebClient - FF103 (Linux)/8.8.15_GA_4372) Thread-Index: F7oOQWdMenIxdDZOhR4ztlxSiCsK7A== Thread-Topic: Userspace RCU 0.12.4 and 0.13.2 Subject: [lttng-dev] [RELEASE] Userspace RCU 0.12.4 and 0.13.2 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: Mathieu Desnoyers via lttng-dev Reply-To: Mathieu Desnoyers Content-Type: multipart/mixed; boundary="===============9135593134609468304==" Errors-To: lttng-dev-bounces@lists.lttng.org Sender: "lttng-dev" --===============9135593134609468304== Content-Type: multipart/alternative; boundary="=_607ce2e3-f2e9-41a9-914c-fcad0be8df17" --=_607ce2e3-f2e9-41a9-914c-fcad0be8df17 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Hi, This is stable release announcement for the Userspace RCU project. It covers the two currently maintained stable branches: 0.12 and 0.13, respectively with releases v0.12.4 and v0.13.2. Especially for the spurious futex wakeup fix, users of the 0.12 and 0.13 (or older) liburcu branches are recommended to upgrade. * Noteworthy in these releases: - Handle spurious futex wakeups in urcu-qsbr, urcu, urcu-wait, defer_rcu, call_rcu, and workqueue code. This has been known to cause issues where the workqueue worker thread spuriously takes nearly 100% of CPU time. - Change method used by _rcu_dereference ot strip type constness. Rather than using pointer arithmetic (which does not work with opaque types), rely on a statement expression trick. - Fix support for Linux systems where sysconf(_SC_NPROCESSORS_CONF) can return a value less than max cpu id. Project website: https://liburcu.org Feedback is welcome! Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com --=_607ce2e3-f2e9-41a9-914c-fcad0be8df17 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Hi,

This is stable release announcement for the Userspace RCU project.
It covers the two currently maintained stable branches: 0.12 a= nd 0.13,
respectively with releases v0.12.4 and v0.13.2.

Especially f= or the spurious futex wakeup fix, users of the 0.12 and 0.13 (or older)
liburcu branches are recommended to upgrade.

* Noteworthy in these relea= ses:

- Handle spurio= us futex wakeups in urcu-qsbr, urcu, urcu-wait, defer_rcu, call_rcu,
<= div>  and workqueue code. This has been known to cause issues where th= e workqueue
  worker thread spuriously takes nearly 100% of = CPU time.

- Change = method used by _rcu_dereference ot strip type constness.
  R= ather than using pointer arithmetic (which does not work with opaque types)= ,
  rely on a statement expression = trick.

- Fix support for Linux systems where sysconf(_SC_NPROCESSORS_CONF) can<= br data-mce-bogus=3D"1">
  return a value less than max cpu = id.

Project website: https://liburcu= .org

Feedback is welcome!
<= div>
Thanks,

Mathieu

--
Mathieu Desnoyers
EfficiOS Inc.
http://www.effici= os.com
--=_607ce2e3-f2e9-41a9-914c-fcad0be8df17-- --===============9135593134609468304== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev --===============9135593134609468304==--