linux-kernel - Re: [PATCH/RFC 1/2] jump label: make enable/disable o(1)

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Message-ID: <1292532221.2708.93.camel@laptop>
Date:	Thu, 16 Dec 2010 21:43:41 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Jason Baron <jbaron@...hat.com>, athieu.desnoyers@...ymtl.ca,
	hpa@...or.com, rostedt@...dmis.org, mingo@...e.hu,
	tglx@...utronix.de, andi@...stfloor.org, roland@...hat.com,
	rth@...hat.com, masami.hiramatsu.pt@...achi.com,
	fweisbec@...il.com, avi@...hat.com, davem@...emloft.net,
	sam@...nborg.org, ddaney@...iumnetworks.com,
	michael@...erman.id.au, linux-kernel@...r.kernel.org
Subject: Re: [PATCH/RFC 1/2] jump label: make enable/disable o(1)

On Thu, 2010-12-16 at 15:36 -0500, Mathieu Desnoyers wrote:
> Tracepoints keep their own reference counts for enable/disable, so a
> simple "enable/disable" is fine as far as tracepoints are concerned. Why
> does perf need that refcounting done by the static jumps ?

Because the refcount is all we have... Why not replace that tracepoint
refcount with the jumplabel thing?
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