From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from simark.ca by simark.ca with LMTP id lHV0MAkXs2KJSAQAWB0awg (envelope-from ) for ; Wed, 22 Jun 2022 09:20:09 -0400 Received: by simark.ca (Postfix, from userid 112) id AE7181E220; Wed, 22 Jun 2022 09:20:09 -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=MbJyhHjN; 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=-3.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 Received: from lists.lttng.org (lists.lttng.org [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 60D301E15C for ; Wed, 22 Jun 2022 09:20:08 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=lists.lttng.org; s=default; t=1655904007; bh=iHr/a1+Gkb6Fht+6GaRYxl9Jl10/R/UVbmHXRlOwssQ=; h=Date:To:Cc:In-Reply-To:References:Subject:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From:Reply-To:From; b=MbJyhHjNDknKgvXhBq1GcjulVVqnIG3CvmFgL0xUoujOfK7WnwY7YBt5m+LegGSPw g1aKpEnhl4bs+AAK2vN9dLQ/2y6cMIfPAU1jECNrZq1Jj2Fc8lIAmMdy1KwP2xUf4o gHydoOkqIDpzUnhcsAQ0laSQgqhjuIw0PMWxgcH8o428ApI2wfUyZq7sKjekhElY53 kkoTh/U2iivfYI2HGFOP3sCcWmbHA7rJH/42c9WCujjrnr/J46d7z8QwOV1h483cdz 10ZOcXMLHlWh9TJKJC0IWx3WSDqg4+qASpvcTD/9Y6yHpcMPaZOUq3T9TVANb77BMA QN4qnjCZNlBWQ== Received: from lists-lttng01.efficios.com (localhost [IPv6:::1]) by lists.lttng.org (Postfix) with ESMTP id 4LSkWq4lH7zD74; Wed, 22 Jun 2022 09:20:07 -0400 (EDT) Received: from mail.efficios.com (mail.efficios.com [167.114.26.124]) by lists.lttng.org (Postfix) with ESMTPS id 4LSkWp22FLzCTv for ; Wed, 22 Jun 2022 09:20:05 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mail.efficios.com (Postfix) with ESMTP id 8A5CC287D3F for ; Wed, 22 Jun 2022 09:19:59 -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 yEMZ-6euHPlw; Wed, 22 Jun 2022 09:19:59 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mail.efficios.com (Postfix) with ESMTP id 12BFD287D3D; Wed, 22 Jun 2022 09:19:59 -0400 (EDT) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.efficios.com 12BFD287D3D 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 zoEE0CFGIcbz; Wed, 22 Jun 2022 09:19:59 -0400 (EDT) Received: from mail03.efficios.com (mail03.efficios.com [167.114.26.124]) by mail.efficios.com (Postfix) with ESMTP id 07461287D3C; Wed, 22 Jun 2022 09:19:59 -0400 (EDT) Date: Wed, 22 Jun 2022 09:19:58 -0400 (EDT) To: Minlan Wang Cc: lttng-dev , paulmck Message-ID: <1420937751.21327.1655903998961.JavaMail.zimbra@efficios.com> In-Reply-To: <20220622074535.GA269641@localhost.localdomain>+6EDBC2C12E8A16E5> References: <20220614035533.GA174967@localhost.localdomain> <20220615034900.GA187807@localhost.localdomain> <396090936.61897.1655302558168.JavaMail.zimbra@efficios.com> <20220616080912.GA246781@localhost.localdomain> <1711122492.5944.1655473043420.JavaMail.zimbra@efficios.com> <20220621035206.GA267474@localhost.localdomain> <1843612610.17820.1655817158376.JavaMail.zimbra@efficios.com> <20220622074535.GA269641@localhost.localdomain> MIME-Version: 1.0 X-Originating-IP: [167.114.26.124] X-Mailer: Zimbra 8.8.15_GA_4304 (ZimbraWebClient - FF100 (Linux)/8.8.15_GA_4304) Thread-Topic: ***UNCHECKED*** Re: Re: urcu workqueue thread uses 99% of cpu while workqueue is empty Thread-Index: /dYvM5tb7eJkihrmAnXa3+eAc0+3EA== Subject: Re: [lttng-dev] ***UNCHECKED*** Re: Re: urcu workqueue thread uses 99% of cpu while workqueue is empty 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: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: lttng-dev-bounces@lists.lttng.org Sender: "lttng-dev" ----- On Jun 22, 2022, at 3:45 AM, Minlan Wang wangminlan@szsandstone.com wrote: [...] Hi Minlan, > -- > 1.8.3.1 > > > And the lttng session is configured to trace these events: > kernel: syscall futex On the kernel side, in addition to the syscall futex, I would really like to see what happens in the scheduler, mainly the wait/wakeup tracepoints. This can be added by using: lttng enable-event -k 'sched_*' This should help us confirm whether we indeed have a situation where queued wake ups happen to wake up a wait happening only later, which is unexpected by the current liburcu userspace code. [...] > --- > > The babletrace output of this session is pretty big, 6 MB in size, i put it in > the attachment trace_0622.tar.bz2. > Let my know if your mailbox can't handle such big attachment. It would be even better if you can share the binary trace, because then it's easy to load it in trace compass, cut away time ranges that don't matter, and lots of other useful stuff. Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev