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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=LRGh6td70WGdmcMGRp1Cc0ENwiVhacG+3GURE37PQRY=; b=dSZOaKa+361aAJVOwb4aPXEVOHyFnkKANEa5Q+2/Os8j6nODTyOZunVKJsTq4rIy+7 NiWPMeLSS4cLJgxL+UZfxh6RqzBEkLlJKUxXjaqoA2pJAfZhOo37HUeUCuTTkJQMmklR YvCCDpYEYQWwRhUrlZOSQ7VJxJteH9yo53qRG74gePuRLuwyjsopobGVzFGoUW1Z2EBJ yLyGSHmnJc0u95Rb51YmTNmdiclYLtUFUEMCstliF/jNXHiJa+HyagppP0WwXJHCN9yU xLae5FRiC4EI63twa+yg2dltNt6KJbNc2CgRJl5RZUExtbnOfXIbNjOowYDm7WmTbrr+ Dmhw== X-Gm-Message-State: AOAM533RVnkEq4Wq73gpOFfGuVNRF+BbHP1ZOxW4ymXFj2eoY4OTrQmN RwrhQZZX7siWj4TZSQz9lQvo2xAHeGAMmcscTLU= X-Google-Smtp-Source: ABdhPJyIQzixlwZawM13KFKv+/9Vrhh6ZnO8DyH1IQEASFpfh82lPE9sWf9iZMZFsPo6igJmpnwc9DB1NFy4l16FgZI= X-Received: by 2002:a05:6602:164b:: with SMTP id y11mr6027737iow.9.1635772371384; Mon, 01 Nov 2021 06:12:51 -0700 (PDT) MIME-Version: 1.0 References: <20211101060419.4682-1-laoar.shao@gmail.com> In-Reply-To: From: Yafang Shao Date: Mon, 1 Nov 2021 21:12:15 +0800 Message-ID: Subject: Re: [PATCH v7 00/11] extend task comm from 16 to 24 To: Matthew Wilcox Cc: Andrew Morton , Kees Cook , Steven Rostedt , Mathieu Desnoyers , Arnaldo Carvalho de Melo , Petr Mladek , Peter Zijlstra , Al Viro , Valentin Schneider , Qiang Zhang , robdclark , christian , Dietmar Eggemann , Ingo Molnar , Juri Lelli , Vincent Guittot , David Miller , Jakub Kicinski , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin Lau , Song Liu , Yonghong Song , john fastabend , KP Singh , dennis.dalessandro@cornelisnetworks.com, mike.marciniszyn@cornelisnetworks.com, dledford@redhat.com, jgg@ziepe.ca, linux-rdma@vger.kernel.org, netdev , bpf , "linux-perf-use." , linux-fsdevel@vger.kernel.org, Linux MM , LKML , kernel test robot , kbuild test robot Content-Type: text/plain; charset="UTF-8" Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=D1c3niaA; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf22.hostedemail.com: domain of laoar.shao@gmail.com designates 209.85.166.43 as permitted sender) smtp.mailfrom=laoar.shao@gmail.com X-Stat-Signature: g7ypewme7ysk7p15hhpty7zkegxrx9mn X-Rspamd-Queue-Id: 013F6190C X-Rspamd-Server: rspam01 X-HE-Tag: 1635772371-445606 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 Mon, Nov 1, 2021 at 8:46 PM Matthew Wilcox wrote: > > On Mon, Nov 01, 2021 at 06:04:08AM +0000, Yafang Shao wrote: > > There're many truncated kthreads in the kernel, which may make trouble > > for the user, for example, the user can't get detailed device > > information from the task comm. > > > > This patchset tries to improve this problem fundamentally by extending > > the task comm size from 16 to 24, which is a very simple way. > > It can't be that simple if we're on v7 and at 11 patches! > Most of the changes are because of hard-coded 16 that can't be easily grepped. In these 11 patches, patch #1, #2, #4, #5, #6, #7 and #9 are cleanups, which can be a different patchset. The core changes of these patchset are patch #3, #8 and #10. #11 can also be a seperate patch. > It would be helpful if you included links to earlier postings. I can > only find v5 and v6 in my inbox, so I fear I'm going to re-ask some > questions which were already answered. > v1: https://lore.kernel.org/lkml/20210929115036.4851-1-laoar.shao@gmail.com/ v2: https://lore.kernel.org/lkml/20211007120752.5195-1-laoar.shao@gmail.com/ v3: https://lore.kernel.org/lkml/20211010102429.99577-1-laoar.shao@gmail.com/ v4: https://lore.kernel.org/lkml/20211013102346.179642-1-laoar.shao@gmail.com/ v5: https://lore.kernel.org/lkml/20211021034516.4400-1-laoar.shao@gmail.com/ v6: https://lore.kernel.org/lkml/20211025083315.4752-1-laoar.shao@gmail.com/ > Why can't we shorten the names of these kthreads? You didn't > give any examples, so I can't suggest any possibilities. > Take 'jbd2/nvme0n1p2-' for example, that's a nice name, which gives a good description via the name. And I don't think it is a good idea to shorten its name. -- Thanks Yafang