linux-kernel - Re: [PATCH] lockdep: Show up to three levels for a deadlock scenario

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Message-ID: <3317dd1a-1a39-3295-eb90-538be296dff8@oracle.com>
Date:   Tue, 19 Dec 2017 11:30:29 -0500
From:   Dhaval Giani <dhaval.giani@...cle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] lockdep: Show up to three levels for a deadlock scenario

On 2017-12-14 12:59 PM, Peter Zijlstra wrote:
> On Thu, Dec 14, 2017 at 12:38:52PM -0500, Steven Rostedt wrote:
>>
>> Currently, when lockdep detects a possible deadlock scenario that involves 3
>> or more levels, it just shows the chain, and a CPU sequence order of the
>> first and last part of the scenario, leaving out the middle level and this
>> can take a bit of effort to understand. By adding a third level, it becomes
>> easier to see where the deadlock is.
> 
> So is anybody actually using this? This (together with the callchain for
> #0) is always the first thing of the lockdep output I throw away.
> 

Yes :-). The other stuff is unreadable to people not you.

Dhaval