linux-kernel - Re: Porting "jump labels" to userspace (was: Re: [ltt-dev] LTTng-UST vs SystemTap userspace tracing benchmarks)

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Date:	Wed, 16 Feb 2011 12:04:49 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	Mark Wielaard <mjw@...hat.com>,
	Stefan Hajnoczi <stefanha@...il.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Julien Desfossez <julien.desfossez@...ymtl.ca>,
	dominique.toupin@...csson.com, ltt-dev@...ts.casi.polymtl.ca,
	systemtap@...rces.redhat.com, linux-kernel@...r.kernel.org,
	Jason Baron <jbaron@...hat.com>, hpa@...or.com,
	rostedt@...dmis.org, mingo@...e.hu, tglx@...utronix.de,
	andi@...stfloor.org, 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,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: Porting "jump labels" to userspace (was: Re: [ltt-dev] LTTng-UST
	vs SystemTap userspace tracing benchmarks)

IMHO there is not really so much to the in-kernel implementation that it's
worth attempting to reuse the code in userland.  Pretty much all the work
is in the details of the implementation that would naturally differ a lot
in a different context.  If you understand the mechanism and the machine
details, then implementing it well for a userland context is not a big deal
and is cleaner to do from scratch than shoe-horning kernel-centric code
into a wildly different context.


Thanks,
Roland
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