linux-kernel - Re: [PATCH][v3] rtnetlink: add rtnl

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Message-ID: <CAM_iQpVWSJ8BdRoLDX0MdiqmJn2dp+U9JM4mcfzRbVn4MZbzcg@mail.gmail.com>
Date:   Tue, 11 May 2021 10:00:43 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Rocco yue <rocco.yue@...iatek.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-mediatek@...ts.infradead.org, wsd_upstream@...iatek.com
Subject: Re: [PATCH][v3] rtnetlink: add rtnl_lock debug log

On Tue, May 11, 2021 at 4:46 AM Rocco yue <rocco.yue@...iatek.com> wrote:
>
> From: Rocco Yue <rocco.yue@...iatek.com>
>
> We often encounter system hangs caused by certain process
> holding rtnl_lock for a long time. Even if there is a lock
> detection mechanism in Linux, it is a bit troublesome and
> affects the system performance. We hope to add a lightweight
> debugging mechanism for detecting rtnl_lock.

Any reason why this is specific to RTNL lock? To me holding
a mutex lock for a long time is problematic for any mutex.
I have seen some fs mutex being held for a long time caused
many hung tasks in the system.

Thanks.