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Re: [PATCH 4/5] monitor: removed cpustats command

From: Markus Armbruster
Subject: Re: [PATCH 4/5] monitor: removed cpustats command
Date: Tue, 08 Jun 2021 17:10:32 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux)

Greg Kurz <groug@kaod.org> writes:

> On Wed, 26 May 2021 17:21:03 -0300
> "Bruno Larsen (billionai)" <bruno.larsen@eldorado.org.br> wrote:
>> Since ppc was the last architecture to collect these statistics and
>> it is currently phasing this collection out, the command that would query
>> this information is being removed.
> So this is removing an obviously user visible feature. This should be
> mentioned in docs/system/removed-features.rst... but, wait, I don't
> see anything for it in docs/system/deprecated.rst. This is dropping
> a feature without following the usual deprecation policy, i.e.
> marking the feature as deprecated and only remove it 2 QEMU versions
> later. Any justification for that ?

Our deprecation policy applies to stable interfaces, which HMP is not.

We don't break things there just because.  But dropping a command right
away when it is no longer useful is just fine.  No need to deprecate and
wait for the grace period.


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