linux-kernel - Re: [PATCH v2] sched/debug: Add new tracepoint to track cpu

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Message-ID: <X/xa1WBqu8ZOl5QD@hirez.programming.kicks-ass.net>
Date:   Mon, 11 Jan 2021 15:04:05 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Qais Yousef <qais.yousef@....com>
Cc:     Phil Auld <pauld@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        vincent.donnefort@....com, mingo@...hat.com,
        vincent.guittot@...aro.org, linux-kernel@...r.kernel.org,
        valentin.schneider@....com
Subject: Re: [PATCH v2] sched/debug: Add new tracepoint to track cpu_capacity

On Mon, Jan 04, 2021 at 06:26:42PM +0000, Qais Yousef wrote:

> So I have a proper patch for that now, that actually turned out to be really
> tiny once you untangle exactly what is missing.
> 
> Peter, bpf programs aren't considered ABIs AFAIK, do you have concerns about
> that?

In order to use these you need to rely on BTF to get anything useful
done right? And anything that relies on BTF cannot be ABI.