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

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Date:   Mon, 5 Feb 2018 10:02:59 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        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>
Subject: Re: [PATCH 00/18] [ANNOUNCE] Dynamically created function based
 events

On Sun, 4 Feb 2018 11:25:20 +0900
Namhyung Kim <namhyung@...nel.org> wrote:

> I'm interested in this.  From my understanding, it's basically
> function tracing + filter + custom argument info, right?
> 
> Supporting arguments with complex type could be error-prone.
> We need to prevent malfunctions by invalid inputs.

All reads are done with probe_kernel_read(). If it faults (at any
stage), it simply returns "0".

-- Steve