linux-kernel - Re: [PATCH v3 2/2] locking/debug: Add a master lock debugging switch

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Message-ID: <20180327231321.4on2kczby5ejqglt@linux-n805>
Date:   Tue, 27 Mar 2018 16:13:21 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Waiman Long <longman@...hat.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] locking/debug: Add a master lock debugging switch

On Tue, 27 Mar 2018, Waiman Long wrote:

>Add a new master LOCK_DEBUGGING Kconfig option to turn on all the lock
>debugging options except the selftests and the torture tests.

For what purpose?

I'm not sure we want yet another config debug option. These are all expert
level configuration and honestly I would rather such users _think_ about
what options they are enabling instead of giving them a large hammer.

If enough load, this can also make boxes completely locked up for any sort of
testing/debugging. I vote no.

Also, CI efforts such 0-day already have the necessary scripting to cover the
debug options that make sense.

Thanks,
Davidlohr