linux-kernel - Re: [PATCH] nvme: Print capabilities changes just once

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Date:   Wed, 14 Jun 2023 07:01:02 +0200
From:   Christoph Hellwig <hch@....de>
To:     Keith Busch <kbusch@...nel.org>
Cc:     Breno Leitao <leitao@...ian.org>, Jens Axboe <axboe@...nel.dk>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>, leit@...com,
        "open list:NVM EXPRESS DRIVER" <linux-nvme@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] nvme: Print capabilities changes just once

On Tue, Jun 13, 2023 at 04:00:58PM -0600, Keith Busch wrote:
> On Tue, Jun 13, 2023 at 10:55:37AM -0700, Breno Leitao wrote:
> > This current dev_info() could be very verbose and being printed very
> > frequently depending on some userspace application sending some specific
> > commands.
> > 
> > Let's turn it into a dev_info_once(), since it is not useful to know
> > about it all the time.
> 
> This looks good to me. Vendors sometimes put unnecessary effects in the
> log, and spamming the same recommendation to repeated operations isn't
> going to be helpful. I expect anyone who knows what they're doing can
> consult the effects log directly and take appropriate action on their
> own.

Hmm, once seems very little.  It might make more sense to do this
once and then skip it until the controller has been reset.