linux-kernel - Re: [PATCH RFC smp] Remove diagnostics and adjust config for CSD lock diagnostics

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Date:   Tue, 21 Mar 2023 11:22:20 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel-team@...a.com,
        rostedt@...dmis.org, jgross@...e.com, mingo@...nel.org,
        corbet@....net
Subject: Re: [PATCH RFC smp] Remove diagnostics and adjust config for CSD
 lock diagnostics

On Mon, Mar 20, 2023 at 05:54:39PM -0700, Paul E. McKenney wrote:
> Hello!
> 
> This series removes CSD-lock diagnostics that were once very useful
> but which have not seen much action since.  It also adjusts Kconfig and
> kernel-boot-parameter setup.
> 
> 1.	locking/csd_lock: Add Kconfig option for csd_debug default.
> 
> 2.	locking/csd_lock: Remove added data from CSD lock debugging.
> 
> 3.	locking/csd_lock: Remove per-CPU data indirection from CSD
> 	lock debugging.
> 
> 4.	kernel/smp: Make csdlock_debug= resettable.
> 
> 						Thanx, Paul
> 
> ------------------------------------------------------------------------
> 
>  Documentation/admin-guide/kernel-parameters.txt   |   17 -
>  b/Documentation/admin-guide/kernel-parameters.txt |    6 
>  b/kernel/smp.c                                    |    2 
>  b/lib/Kconfig.debug                               |    9 
>  kernel/smp.c                                      |  260 ++--------------------
>  5 files changed, 47 insertions(+), 247 deletions(-)

Yay!! How do you want to route these, should I take them through tip?

What about the rest of the thing? Your commits seem to suggest it's
still actually used -- why? Are there still more virt bugs?