linux-kernel - Re: [patch 3/9] LTTng instrumentation tasklets

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Message-ID: <20090324175621.GE31117@elte.hu>
Date:	Tue, 24 Mar 2009 18:56:21 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	ltt-dev@...ts.casi.polymtl.ca,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jason Baron <jbaron@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Russell King <rmk+lkml@....linux.org.uk>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Hideo AOKI <haoki@...hat.com>,
	Takashi Nishiie <t-nishiie@...css.fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
Subject: Re: [patch 3/9] LTTng instrumentation tasklets


* Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:

> tasklet entry and exit events.

> +DEFINE_TRACE(irq_tasklet_high_entry);
> +DEFINE_TRACE(irq_tasklet_high_exit);
> +DEFINE_TRACE(irq_tasklet_low_entry);
> +DEFINE_TRACE(irq_tasklet_low_exit);

Dunno - tasklets are a legacy mechanism, not sure we want to 
instrument them. That some tasklet activity happens will be obvious 
from the softirq tracepoints already.

Anyway ... i guess we could do it if it's done via the more complete 
TRACE_EVENT() mechanism in the tracing tree.

	Ingo
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