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([2601:188:c100:5710:627d:9ff:fe85:9ade]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6e8f707c3dfsm2259236d6.7.2025.03.05.19.10.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 05 Mar 2025 19:10:12 -0800 (PST) From: Waiman Long X-Google-Original-From: Waiman Long Message-ID: Date: Wed, 5 Mar 2025 22:10:10 -0500 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 1/2] hung_task: Show the blocker task if the task is hung on mutex To: Waiman Long , Peter Zijlstra Cc: Ingo Molnar , Will Deacon , Boqun Feng , Joel Granados , Anna Schumaker , Lance Yang , Kent Overstreet , Yongliang Gao , Steven Rostedt , Tomasz Figa , Sergey Senozhatsky , linux-kernel@vger.kernel.org, "Masami Hiramatsu (Google)" , Andrew Morton References: <174046694331.2194069.15472952050240807469.stgit@mhiramat.tok.corp.google.com> <174046695384.2194069.16796289525958195643.stgit@mhiramat.tok.corp.google.com> <21a692ce-3fa4-48f2-8d1c-5542c1cfb15c@redhat.com> <20250306113236.aa39a5928c8106c13144df4d@kernel.org> <5f7bc403-be75-4ae3-b6ff-5ff0673847f9@redhat.com> Content-Language: en-US In-Reply-To: <5f7bc403-be75-4ae3-b6ff-5ff0673847f9@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 3/5/25 10:07 PM, Waiman Long wrote: > > > On 3/5/25 9:32 PM, Masami Hiramatsu (Google) wrote: >>>> +config DETECT_HUNG_TASK_BLOCKER >>>> + bool "Dump Hung Tasks Blocker" >>>> + depends on DETECT_HUNG_TASK >>>> + depends on !PREEMPT_RT >>>> + default y >>>> + help >>>> + Say Y here to show the blocker task's stacktrace who acquires >>>> + the mutex lock which "hung tasks" are waiting. >>>> + This will add overhead a bit but shows suspicious tasks and >>>> + call trace if it comes from waiting a mutex. >>>> + >>>> config WQ_WATCHDOG >>>> bool "Detect Workqueue Stalls" >>>> depends on DEBUG_KERNEL >>>> >>> Reviewed-by: Waiman Long >>> >> Thanks Waiman! BTW, who will pick this patch? >> Andrew, could you pick this series? > > Peter, do you mind routing this patch via Andrew? > Resend as plain text. Regards, Longman