linux-kernel - Re: [lttng-dev] Perf ABI (was: Re: [PATCH 09/11] sched: export task

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Message-ID: <1326386087.7642.92.camel@gandalf.stny.rr.com>
Date:	Thu, 12 Jan 2012 11:34:47 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	devel@...verdev.osuosl.org, Ted Ts'o <tytso@....edu>,
	Peter Zijlstra <peterz@...radead.org>,
	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	lttng-dev@...ts.lttng.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [lttng-dev] Perf ABI (was: Re: [PATCH 09/11] sched: export
 task_prio to GPL modules)

On Thu, 2012-01-12 at 11:27 -0500, Mathieu Desnoyers wrote:

> > What udev did is more like what you want to do than what I did with
> > trace-cmd.
> 
> OK. Then how can trace-cmd support the LTTng features ?

New syscalls, or new files, and simply check if they exist.

New features should not break old ones.

-- Steve


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