linux-kernel - Re: [RFC PATCH v2 00/15] tracing: of: Boot time tracing using devicetree

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Date:   Mon, 22 Jul 2019 23:38:26 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Frank Rowand <frowand.list@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Rob Herring <robh+dt@...nel.org>, Tim Bird <Tim.Bird@...y.com>,
        Ingo Molnar <mingo@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [RFC PATCH v2 00/15] tracing: of: Boot time tracing using
 devicetree

Hello,

I discussed with Frank and other kernel developers last week at OSSJ 2019.
Eventually, I decided to leave from devicetree, because it can unstabilize
current devicetree desgin and policy. Instead, aim to introduce a new
generic structured kernel cmdline, something like "configtree".

I thought JSON or other generic data format, but they look a bit bloated
for my purpose. I just need something like "extended hierarchical kernel
cmdline". For example,

ftrace {
  options = "sym-addr"
  events = "initcall:*"
  tp-printk
  event.0 {
    name = "tasl:task_newtask"
    filter = "pid < 128"
  } 
}

Which can be written as

ftrace.options="sym-addr" ftrace.events="initcall:*" ftrace.tp-printk ftrace.event.0.name="tasl:task_newtask" ftrace.event.0.filter="pid < 128"

on current kernel cmdline.

So, the parameters are linearly extended from current kernel cmdline.
Kernel internal APIs must be able to handle both of current cmdline
key-values and configtree key-values.

Thank you,

-- 
Masami Hiramatsu <mhiramat@...nel.org>