From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from simark.ca by simark.ca with LMTP id lKtbHoeZ/mIrUCkAWB0awg (envelope-from ) for ; Thu, 18 Aug 2022 15:56:55 -0400 Received: by simark.ca (Postfix, from userid 112) id 66A221E4A7; Thu, 18 Aug 2022 15:56:55 -0400 (EDT) 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=abeoYeXr; dkim-atps=neutral X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on simark.ca X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HTML_MESSAGE,MAILING_LIST_MULTI,RDNS_NONE autolearn=no autolearn_force=no version=3.4.6 Received: from lists.lttng.org (unknown [167.114.26.123]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by simark.ca (Postfix) with ESMTPS id 782B41E21F for ; Thu, 18 Aug 2022 15:56:40 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=lists.lttng.org; s=default; t=1660852594; 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=abeoYeXrqf+ysLMrips61ApnRbcWsqewcPFhPFABpCMelGYuMV6hjr6sfGXWtUM9k Pq/lbP5KZtsBpVxkrooY/8jkoiF3fgBQajappaQK5wTRiZgbAlXOIFFvpIqjs2ot3/ D8gR58SdrjSN+mNy7WuBr+V3YpoHhfDscjPb1mCrT++tJknR3bYTqGX2KagR9OUfbn OqycxNF3zJx4hKW8l4z9bIzZqvPzIT0A/XcqRh5NB/iCtRj1tGbxnR/JhE3qwIV216 9gG4zzisFh29vRlELW/4ty0u4F6flPt/LEbottC6zVuHdopd0TwPQ09SKgM+KrKCfI zCkLf9Aw6Pbuw== Received: from lists-lttng01.efficios.com (localhost [IPv6:::1]) by lists.lttng.org (Postfix) with ESMTP id 4M7wcy3lwcz1JnW; 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
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