netdev - Re: [PATCH v7 bpf-next 06/10] tracepoint: compute num

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Message-ID: <20180328141045.1202afeb@gandalf.local.home>
Date:   Wed, 28 Mar 2018 14:10:45 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Alexei Starovoitov <ast@...com>
Cc:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        "David S. Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        netdev <netdev@...r.kernel.org>,
        kernel-team <kernel-team@...com>,
        linux-api <linux-api@...r.kernel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH v7 bpf-next 06/10] tracepoint: compute num_args at build
 time

On Wed, 28 Mar 2018 11:03:24 -0700
Alexei Starovoitov <ast@...com> wrote:

> I can live with this overhead if Mathieu insists,
> but I prefer to keep it in 'struct tracepoint'.
> 
> Thoughts?

I'm fine with keeping it as is. We could probably use it for future
enhancements in perf and ftrace.

Perhaps, we should just add a:

#ifdef CONFIG_BPF_EVENTS

Around the use cases of num_args.

-- Steve