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

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Date:   Thu, 1 Sep 2022 09:42:27 +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,
        masahiroy@...nel.org, nathan@...nel.org, changbin.du@...el.com,
        ytcoode@...il.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        bristot@...hat.com, vschneid@...hat.com, cl@...ux.com,
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        kasan-dev@...glegroups.com, io-uring@...r.kernel.org,
        linux-arch@...r.kernel.org, xen-devel@...ts.xenproject.org,
        linux-bcache@...r.kernel.org, linux-modules@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 00/30] Code tagging framework and applications

On Thu, Sep 01, 2022 at 09:05:36AM +0200, Peter Zijlstra wrote:
> 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.

Look at kernel/trace/blktrace.c for a fine in-kernel !BFP example of this.