From: Andrew Morton <akpm@linux-foundation.org>
To: Lance Yang <ioworker0@gmail.com>
Cc: will@kernel.org, peterz@infradead.org, mingo@redhat.com,
longman@redhat.com, mhiramat@kernel.org,
anna.schumaker@oracle.com, boqun.feng@gmail.com,
joel.granados@kernel.org, kent.overstreet@linux.dev,
leonylgao@tencent.com, linux-kernel@vger.kernel.org,
rostedt@goodmis.org, senozhatsky@chromium.org,
tfiga@chromium.org, amaindex@outlook.com, jstultz@google.com,
Mingzhe Yang <mingzhe.yang@ly.com>
Subject: Re: [PATCH v4 1/3] hung_task: replace blocker_mutex with encoded blocker
Date: Mon, 7 Apr 2025 13:08:25 -0700 [thread overview]
Message-ID: <20250407130825.69b4c879b242df4caaf426cf@linux-foundation.org> (raw)
In-Reply-To: <20250320064923.24000-2-ioworker0@gmail.com>
On Thu, 20 Mar 2025 14:49:21 +0800 Lance Yang <ioworker0@gmail.com> wrote:
> This patch replaces 'struct mutex *blocker_mutex' with 'unsigned long
> blocker', as only one blocker is active at a time.
>
> The blocker filed can store both the lock addrees and the lock type, with
> LSB used to encode the type as Masami suggested, making it easier to extend
> the feature to cover other types of locks.
>
> Also, once the lock type is determined, we can directly extract the address
> and cast it to a lock pointer ;)
>
> ...
>
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -1218,7 +1218,7 @@ struct task_struct {
> #endif
>
> #ifdef CONFIG_DETECT_HUNG_TASK_BLOCKER
> - struct mutex *blocker_mutex;
> + unsigned long blocker;
-ENOCOMMENT
next prev parent reply other threads:[~2025-04-07 20:08 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-20 6:49 [PATCH v4 0/3] hung_task: extend blocking task stacktrace dump to semaphore Lance Yang
2025-03-20 6:49 ` [PATCH v4 1/3] hung_task: replace blocker_mutex with encoded blocker Lance Yang
2025-04-07 20:08 ` Andrew Morton [this message]
2025-04-08 12:29 ` Lance Yang
2025-03-20 6:49 ` [PATCH v4 2/3] hung_task: show the blocker task if the task is hung on semaphore Lance Yang
2025-04-07 20:08 ` Andrew Morton
2025-04-07 20:08 ` Andrew Morton
2025-04-08 12:27 ` Lance Yang
2025-03-20 6:49 ` [PATCH v4 3/3] samples: extend hung_task detector test with semaphore support Lance Yang
2025-04-07 20:08 ` [PATCH v4 0/3] hung_task: extend blocking task stacktrace dump to semaphore Andrew Morton
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