linux-kernel - Re: [RFD] Future tracing/instrumentation directions

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Message-Id: <34C06D7E-3CAF-41C9-A0B0-A14D71E81F1F@mit.edu>
Date:	Thu, 20 May 2010 08:19:04 -0400
From:	Theodore Tso <tytso@....EDU>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Christoph Hellwig <hch@....de>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Johannes Berg <johannes.berg@...el.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Tom Zanussi <tzanussi@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Lin Ming <ming.m.lin@...el.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	Robert Richter <robert.richter@....com>
Subject: Re: [RFD] Future tracing/instrumentation directions


On May 20, 2010, at 7:07 AM, Thomas Gleixner wrote:
> 
> I don't care whether I do
> 
> echo 1 >/debug/..../XXX/enable
> cat /debug/tracing/trace
> 
> or
> 
> perfmini trace enable XXX
> perfmini trace dump
> 
> as long as the tool is built in a way that it does not need updates
> when we add trace points or other functionality to the kernel.

I won't care that much assuming that there is a bash_completion script so I can type "perf mini trace enable ext4_da_writep<TAB>" and the right thing happens....

The point is there are a number of advantages of the current system that go beyond just guaranteed availability of the binary->ascii translation tool.  Command competion, shell globbing to find interesting events you want to enable, etc., are also part of the picture

-- Ted

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