linux-kernel - Re: [PATCH 3/3] kernel/smp: add more data to CSD lock debugging

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Message-ID: <20210301000704.GF2696@paulmck-ThinkPad-P72>
Date:   Sun, 28 Feb 2021 16:07:04 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, mhocko@...e.com,
        Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH 3/3] kernel/smp: add more data to CSD lock debugging

On Fri, Feb 26, 2021 at 10:05:51PM +0100, Peter Zijlstra wrote:
> On Fri, Feb 26, 2021 at 10:12:05AM -0800, Paul E. McKenney wrote:
> > On Fri, Feb 26, 2021 at 05:38:44PM +0100, Peter Zijlstra wrote:
> > > 
> > > I hate all of this, but if this will finally catch the actual problem,
> > > we can then revert all this, so sure.
> > 
> > OK, I will bite...  What exactly do you hate about it?
> 
> It's ugly and messy. We're basically commiting a debug session. Normally
> gunk like this is done in private trees, then we find the problem and
> fix that and crap like this never sees the light of day.

Is your hatred due to the presence of debug code at all, or a belief that
this code is unlikely to be useful in any subsequent IPI-related bug hunt?

							Thanx, Paul