linux-kernel - Re: [PATCH v3] rcu: Add per-CPU rcuc task info to RCU CPU stall warnings

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Message-ID: <df2d15fe-bc81-bdb1-1c31-2d717f274ab0@gnuweeb.org>
Date:   Tue, 25 Jan 2022 14:04:04 +0700
From:   Ammar Faizi <ammarfaizi2@...weeb.org>
To:     Zqiang <qiang1.zhang@...el.com>,
        "Paul E. McKenney" <paulmck@...nel.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] rcu: Add per-CPU rcuc task info to RCU CPU stall
 warnings

On 1/25/22 9:47 AM, Zqiang wrote:
> When the 'use_softirq' be set zero, all RCU_SOFTIRQ processing
> be moved to per-CPU rcuc kthreads, if the rcuc kthreads is
> being starved, quiescent state can not report in time. the
> RCU stall may be triggered. this commit adds a stack trace of
> this CPU and dump rcuc kthreads stack to help analyze what
> prevents rcuc kthreads from running.
> 
> Suggested-by: Ammar Faizi <ammarfaizi2@...weeb.org>
> Signed-off-by: Zqiang <qiang1.zhang@...el.com>
> ---

For https://lore.kernel.org/lkml/20220125024744.4186726-1-qiang1.zhang@intel.com/T/

```

Reviewed-by: Ammar Faizi <ammarfaizi2@...weeb.org>

```
Thank you!
-- 
Ammar Faizi