linux-kernel - Re: [PATCH 00/18] [ANNOUNCE] Dynamically created function based events

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Message-ID: <20180205101011.720f9493@gandalf.local.home>
Date:   Mon, 5 Feb 2018 10:10:11 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        linux-trace-users <linux-trace-users@...r.kernel.org>,
        acme <acme@...nel.org>, Clark Williams <williams@...hat.com>,
        Jiri Olsa <jolsa@...hat.com>, bristot <bristot@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>
Subject: Re: [PATCH 00/18] [ANNOUNCE] Dynamically created function based
 events

On Mon, 5 Feb 2018 11:09:31 +0100
Peter Zijlstra <peterz@...radead.org> wrote:

> As a run-around, Steve then suggested to decouple the trace-hook from
> the actual trace-event. Let the scheduler only provide the hook, nothing
> else. And then allow users to create their own events with the specific
> data they need for their specific use-case.

Actually, we can make the raw tracepoint callback no longer 'notrace',
and then we can extend all tracepoints as well with this.

One issue I hit was the structure randomization for security. If the
structures are randomized, it becomes much more difficult to find
specific aspects of task_struct.

-- Steve