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[209.85.221.47]) by smtp.gmail.com with ESMTPSA id l16-20020a056402125000b0041d527833b9sm9545208edw.3.2022.05.04.11.24.30 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 04 May 2022 11:24:30 -0700 (PDT) Received: by mail-wr1-f47.google.com with SMTP id j15so3154514wrb.2 for ; Wed, 04 May 2022 11:24:30 -0700 (PDT) X-Received: by 2002:a05:6512:b12:b0:44a:ba81:f874 with SMTP id w18-20020a0565120b1200b0044aba81f874mr15410699lfu.449.1651688238925; Wed, 04 May 2022 11:17:18 -0700 (PDT) MIME-Version: 1.0 References: <1651652269-15342-1-git-send-email-byungchul.park@lge.com> In-Reply-To: <1651652269-15342-1-git-send-email-byungchul.park@lge.com> From: Linus Torvalds Date: Wed, 4 May 2022 11:17:02 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH RFC v6 00/21] DEPT(Dependency Tracker) To: Byungchul Park Cc: Damien Le Moal , linux-ide@vger.kernel.org, Andreas Dilger , Ext4 Developers List , Ingo Molnar , Linux Kernel Mailing List , Peter Zijlstra , Will Deacon , Thomas Gleixner , Steven Rostedt , Joel Fernandes , Sasha Levin , Daniel Vetter , Chris Wilson , duyuyang@gmail.com, johannes.berg@intel.com, Tejun Heo , "Theodore Ts'o" , Matthew Wilcox , Dave Chinner , Amir Goldstein , "J. Bruce Fields" , Greg Kroah-Hartman , kernel-team@lge.com, Linux-MM , Andrew Morton , Michal Hocko , Minchan Kim , Johannes Weiner , Vladimir Davydov , sj@kernel.org, Jerome Glisse , Dennis Zhou , Christoph Lameter , Pekka Enberg , David Rientjes , Vlastimil Babka , ngupta@vflare.org, linux-block , paolo.valente@linaro.org, Josef Bacik , linux-fsdevel , Al Viro , Jan Kara , jack@suse.com, Jeff Layton , Dan Williams , Christoph Hellwig , "Darrick J. Wong" , dri-devel , Dave Airlie , rodrigosiqueiramelo@gmail.com, melissa.srw@gmail.com, hamohammed.sa@gmail.com, 42.hyeyoo@gmail.com Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: phy7bo6cuyw1jxem4ko5bzk7fxbp95a1 X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 699E9140081 X-Rspam-User: Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=google header.b=TGN9imab; dmarc=none; spf=pass (imf26.hostedemail.com: domain of torvalds@linuxfoundation.org designates 209.85.208.51 as permitted sender) smtp.mailfrom=torvalds@linuxfoundation.org X-HE-Tag: 1651688670-519487 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, May 4, 2022 at 1:19 AM Byungchul Park wrote: > > Hi Linus and folks, > > I've been developing a tool for detecting deadlock possibilities by > tracking wait/event rather than lock(?) acquisition order to try to > cover all synchonization machanisms. So what is the actual status of reports these days? Last time I looked at some reports, it gave a lot of false positives due to mis-understanding prepare_to_sleep(). For this all to make sense, it would need to not have false positives (or at least a very small number of them together with a way to sanely get rid of them), and also have a track record of finding things that lockdep doesn't. Maybe such reports have been sent out with the current situation, and I haven't seen them. Linus