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

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Date:   Thu, 1 Sep 2022 09:05:35 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Kent Overstreet <kent.overstreet@...ux.dev>
Cc:     Mel Gorman <mgorman@...e.de>,
        Suren Baghdasaryan <surenb@...gle.com>,
        akpm@...ux-foundation.org, mhocko@...e.com, vbabka@...e.cz,
        hannes@...xchg.org, roman.gushchin@...ux.dev, dave@...olabs.net,
        willy@...radead.org, liam.howlett@...cle.com, void@...ifault.com,
        juri.lelli@...hat.com, ldufour@...ux.ibm.com, peterx@...hat.com,
        david@...hat.com, axboe@...nel.dk, mcgrof@...nel.org,
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        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 00/30] Code tagging framework and applications

On Wed, Aug 31, 2022 at 11:59:41AM -0400, Kent Overstreet wrote:

> Also, ftrace can drop events. Not really ideal if under system load your memory
> accounting numbers start to drift.

You could attach custom handlers to tracepoints. If you were to replace
these unconditional code hooks of yours with tracepoints then you could
conditionally (say at boot) register custom handlers that do the
accounting you want.

Nobody is mandating you use the ftrace ringbuffer to consume tracepoints.
Many people these days attach eBPF scripts to them and do whatever they
want.