linux-kernel - Re: [ath9k-devel] ath9k: massive unexplained latency in 2.6.27 (rc5, rc6, probably others)

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Message-ID: <20080927192019.GE18619@elte.hu>
Date:	Sat, 27 Sep 2008 21:20:19 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Steven Noonan <steven@...inklabs.net>,
	"Luis R. Rodriguez" <lrodriguez@...eros.com>,
	Luis Rodriguez <Luis.Rodriguez@...eros.com>,
	"ath9k-devel@...ts.ath9k.org" <ath9k-devel@...ts.ath9k.org>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [ath9k-devel] ath9k: massive unexplained latency in 2.6.27
	(rc5, rc6, probably others)


* Steven Rostedt <rostedt@...dmis.org> wrote:

> 
> I hate trips where my email box becomes filled. I skip over a lot of 
> emails that I should not have.
> 
> On Fri, 19 Sep 2008, Ingo Molnar wrote:
> > 
> > What is needed is to set kernel/trace/trace.c's tracing_disabled 
> > variable to 0. I've Cc:-ed Steve Rostedt - Steve, why is there no easy 
> > ad-hoc way to trigger a stop-tracing event without elaborate changes?
> 
> I think I added a way to do this. Hmm, I think it was in -rt that I added 
> it, and have not gotten around to sending you the updates.
> 
> Yes, we need an easy way to disable the tracer. I think we have 
> ftrace_disable() function. Perhaps that only disables tracing that 
> checks the tracing_disabled variable.

we have kill_ftrace(), but that will permanently zap it.

	Ingo
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