linux-kernel - Re: [RFC PATCH 00/30] Code tagging framework and applications

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Date:   Thu, 1 Sep 2022 09:00:17 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mel Gorman <mgorman@...e.de>
Cc:     Kent Overstreet <kent.overstreet@...ux.dev>,
        Suren Baghdasaryan <surenb@...gle.com>,
        akpm@...ux-foundation.org, mhocko@...e.com, vbabka@...e.cz,
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Subject: Re: [RFC PATCH 00/30] Code tagging framework and applications

On Wed, Aug 31, 2022 at 11:19:48AM +0100, Mel Gorman wrote:

> It's also unclear *who* would enable this. It looks like it would mostly
> have value during the development stage of an embedded platform to track
> kernel memory usage on a per-application basis in an environment where it
> may be difficult to setup tracing and tracking. Would it ever be enabled
> in production? 

Afaict this is developer only; it is all unconditional code.

> Would a distribution ever enable this? 

I would sincerely hope not. Because:

> If it's enabled, any overhead cannot be disabled/enabled at run or
> boot time so anyone enabling this would carry the cost without never
> necessarily consuming the data.

this.