linux-kernel - Re: [PATCH 1/4] tracing: Use the perf recursion protection from trace event

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Date:	Sun, 22 Nov 2009 17:50:45 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Jason Baron <jbaron@...hat.com>
Subject: Re: [PATCH 1/4] tracing: Use the perf recursion protection from
 trace event

On Sun, 2009-11-22 at 17:37 +0100, Frederic Weisbecker wrote:

> That's cleaner but adds an unnecessary overhead in the trace event
> path. We already disable the interrupts there. That's why I preferred
> to let the caller decide.

The trace path is already far from optimal, so I'd rather penalize that
than the regular swcounter path.



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