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From: Steven Rostedt <rostedt@goodmis.org>
To: Piotr Haber <phaber@broadcom.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
	Ingo Molnar <mingo@redhat.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [BUG] ftrace: available_filter_functions empty after unloading module
Date: Thu, 13 Dec 2012 08:34:58 -0500	[thread overview]
Message-ID: <1355405698.17101.373.camel@gandalf.local.home> (raw)
In-Reply-To: <50C5CB74.10008@broadcom.com>

On Mon, 2012-12-10 at 12:45 +0100, Piotr Haber wrote:

> > So you unloaded a module that you were tracing, correct? Hmm, the
> > warning that you hit was an accounting error. The accounting of what
> > functions are traced and what isn't. For some reason it tried to disable
> > a function that wasn't being traced.
> Yes, it happens when i unload a module that i traced before
> 
> > Can you easily reproduce this? If so, can you give my your .config and
> > the steps you used to trigger it.
> Not 100% but it happens often enough to be annoying
> Attached is the config
> As for reproduction, i load the brcmsmac module, add all it symbols to
> set_ftrace_filter, associate with AP and unload the module
> nothing fancy, i use 'function' tracer

Thanks, I'll see if I can reproduce it.

> 
> BTW.
> is it a feature that when there is a traceon trigger added on a function
> from module (like: echo 'brcms_free:traceon' > set_ftrace_filter) after
> module unloading it is not removed?
> just function name gets changed to symbol address

Um, ah, yyyeah! Yeah, yeah, feature. Yep that's a feature alright.

But I think it may be deprecated in the near future.

-- Steve



  reply	other threads:[~2012-12-13 13:35 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-12-06 14:56 [BUG] ftrace: available_filter_functions empty after unloading module Piotr Haber
2012-12-06 18:10 ` Steven Rostedt
2012-12-07  8:06   ` Piotr Haber
2012-12-07 13:57     ` Steven Rostedt
2012-12-10 11:45       ` Piotr Haber
2012-12-13 13:34         ` Steven Rostedt [this message]
2012-12-13 17:08           ` Steven Rostedt
2012-12-13 19:39           ` Steven Rostedt
2012-12-14  0:05             ` Steven Rostedt

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