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

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Message-ID: <alpine.DEB.1.10.0809262117590.29360@gandalf.stny.rr.com>
Date:	Fri, 26 Sep 2008 21:23:20 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
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)

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.

Anyway, I made sure the new ring_buffer code has an easy way to disable 
it.

-- Steve

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