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From: Ingo Molnar <mingo@elte.hu>
To: "Frédéric Weisbecker" <fweisbec@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Steven Rostedt <rostedt@goodmis.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2] tracing/function-graph-tracer: prevent from hrtimer interrupt infinite loop
Date: Thu, 18 Dec 2008 22:16:37 +0100	[thread overview]
Message-ID: <20081218211637.GF24271@elte.hu> (raw)
In-Reply-To: <c62985530812181307k4fc35770x3698101b3981879a@mail.gmail.com>


* Frédéric Weisbecker <fweisbec@gmail.com> wrote:

> Hmm. No, I just tested by setting 1000 HZ and disabled NOHZ, the system 
> doesn't lockup unless I turn on the function graph tracer.

but that's what we are interested in: the system locks up with HZ=1000 and 
with the tracer on - right?

Which means that it's not some hrtimer problem, but simply the traced 
timer tick takes more than 1 millisecond to execute under this 
virtualization.

	Ingo

  reply	other threads:[~2008-12-18 21:17 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-12-18  1:09 [PATCH v2] tracing/function-graph-tracer: prevent from hrtimer interrupt infinite loop Frederic Weisbecker
2008-12-18 10:34 ` Ingo Molnar
2008-12-18 10:48   ` Thomas Gleixner
2008-12-18 10:56     ` Frédéric Weisbecker
2008-12-18 11:22     ` Ingo Molnar
2008-12-18 21:07       ` Frédéric Weisbecker
2008-12-18 21:16         ` Ingo Molnar [this message]
2008-12-18 21:36           ` Frédéric Weisbecker
2008-12-18 21:44             ` Ingo Molnar
2008-12-18 22:00               ` Frédéric Weisbecker
2008-12-21 10:00               ` Ingo Molnar
2008-12-21 10:12                 ` Ingo Molnar
2008-12-21 12:21                   ` Frédéric Weisbecker
2008-12-22 10:46                     ` Frédéric Weisbecker
2008-12-18 10:51   ` Frédéric Weisbecker
2008-12-18 11:16     ` Ingo Molnar

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