linux-kernel - Re: [PATCH V3 5/5] misc: mlx5ctl: Add umem reg/unreg ioctl

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Message-ID: <20231121141053.6133e069@kernel.org>
Date:   Tue, 21 Nov 2023 14:10:53 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Saeed Mahameed <saeedm@...dia.com>
Cc:     Saeed Mahameed <saeed@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        Leon Romanovsky <leonro@...dia.com>,
        Jiri Pirko <jiri@...dia.com>, Leonid Bloch <lbloch@...dia.com>,
        Itay Avraham <itayavr@...dia.com>,
        linux-kernel@...r.kernel.org, David Ahern <dsahern@...nel.org>
Subject: Re: [PATCH V3 5/5] misc: mlx5ctl: Add umem reg/unreg ioctl

On Tue, 21 Nov 2023 13:04:06 -0800 Saeed Mahameed wrote:
> On 21 Nov 12:44, Jakub Kicinski wrote:
>> On Mon, 20 Nov 2023 23:06:19 -0800 Saeed Mahameed wrote:  
>>> high frequency diagnostic counters  
>>
>> So is it a debug driver or not a debug driver?
> 
> High frequency _diagnostic_ counters are a very useful tool for
> debugging a high performance chip. So yes this is for diagnostics/debug.

You keep saying debugging but if it's expected to run on all servers in
the fleet _monitoring_ performance, then it's a very different thing.
To me it certainly moves this driver from "debug thing loaded when
things fail" to the "always loaded in production" category.