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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 CC9D0C433F5 for ; Fri, 4 Mar 2022 03:20:29 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id ED0D410E42E; Fri, 4 Mar 2022 03:20:28 +0000 (UTC) Received: from lgeamrelo11.lge.com (lgeamrelo13.lge.com [156.147.23.53]) by gabe.freedesktop.org (Postfix) with ESMTP id E4F5110E42E for ; Fri, 4 Mar 2022 03:20:26 +0000 (UTC) Received: from unknown (HELO lgeamrelo01.lge.com) (156.147.1.125) by 156.147.23.53 with ESMTP; 4 Mar 2022 12:20:25 +0900 X-Original-SENDERIP: 156.147.1.125 X-Original-MAILFROM: byungchul.park@lge.com Received: from unknown (HELO X58A-UD3R) (10.177.244.38) by 156.147.1.125 with ESMTP; 4 Mar 2022 12:20:24 +0900 X-Original-SENDERIP: 10.177.244.38 X-Original-MAILFROM: byungchul.park@lge.com Date: Fri, 4 Mar 2022 12:20:02 +0900 From: Byungchul Park To: Theodore Ts'o Subject: Re: Report 2 in ext4 and journal based on v5.17-rc1 Message-ID: <20220304032002.GD6112@X58A-UD3R> References: <1646285013-3934-1-git-send-email-byungchul.park@lge.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: hamohammed.sa@gmail.com, jack@suse.cz, peterz@infradead.org, daniel.vetter@ffwll.ch, amir73il@gmail.com, david@fromorbit.com, dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, bfields@fieldses.org, linux-ide@vger.kernel.org, adilger.kernel@dilger.ca, joel@joelfernandes.org, cl@linux.com, will@kernel.org, duyuyang@gmail.com, sashal@kernel.org, paolo.valente@linaro.org, damien.lemoal@opensource.wdc.com, willy@infradead.org, hch@infradead.org, airlied@linux.ie, mingo@redhat.com, djwong@kernel.org, vdavydov.dev@gmail.com, rientjes@google.com, dennis@kernel.org, linux-ext4@vger.kernel.org, linux-mm@kvack.org, ngupta@vflare.org, johannes.berg@intel.com, jack@suse.com, dan.j.williams@intel.com, josef@toxicpanda.com, rostedt@goodmis.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, jglisse@redhat.com, viro@zeniv.linux.org.uk, tglx@linutronix.de, mhocko@kernel.org, vbabka@suse.cz, melissa.srw@gmail.com, sj@kernel.org, rodrigosiqueiramelo@gmail.com, kernel-team@lge.com, gregkh@linuxfoundation.org, jlayton@kernel.org, linux-kernel@vger.kernel.org, penberg@kernel.org, minchan@kernel.org, hannes@cmpxchg.org, tj@kernel.org, akpm@linux-foundation.org, torvalds@linux-foundation.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Thu, Mar 03, 2022 at 09:36:25AM -0500, Theodore Ts'o wrote: > On Thu, Mar 03, 2022 at 02:23:33PM +0900, Byungchul Park wrote: > > I totally agree with you. *They aren't really locks but it's just waits > > and wakeups.* That's exactly why I decided to develop Dept. Dept is not > > interested in locks unlike Lockdep, but fouces on waits and wakeup > > sources itself. I think you get Dept wrong a lot. Please ask me more if > > you have things you doubt about Dept. > > So the question is this --- do you now understand why, even though > there is a circular dependency, nothing gets stalled in the > interactions between the two wait channels? I found a point that the two wait channels don't lead a deadlock in some cases thanks to Jan Kara. I will fix it so that Dept won't complain it. Thanks, Byungchul > > - Ted