From: Daniel Walker <dwalker@mvista.com>
To: gerritbinnenmars@wanadoo.nl
Cc: linux-rt-users@vger.kernel.org
Subject: Re: CONFIG_CRITICAL_IRQSOFF_TIMING
Date: Tue, 30 Oct 2007 14:32:43 -0700 [thread overview]
Message-ID: <1193779963.4673.34.camel@imap.mvista.com> (raw)
In-Reply-To: <25376807.1614051193779617681.JavaMail.www@wwinf6102>
On Tue, 2007-10-30 at 22:26 +0100, Gerrit Binnenmars wrote:
> Daniel, I first applied the rt patchset and then the LTTng patch
> (http://ltt.polymtl.ca/lttng/patch-2.6.22.1-rt4-lttng-0.9.10.tar.gz).
> Then LTT can be selected in the Instrumentation part of the config file.
> further ltt-control is needed (http://ltt.polymtl.ca/lttng/ltt-control-0.43-10082007.tar.gz)
>
> The viewer is only working on i386 but that is not really a problem.
>
> So, I applied the available patches without doing anything special.
Ok .
> Is LTT causing troubles with the preempt_max_latency options?
I doubt it .. I haven't used the histogram options in a month or so ..
But if I remember correctly the value of preempt_max_latency is suppose
to remain at zero .. Usually preempt_max_latency is used to prune off
uninteresting latencies (ones under the max) but if you have the
histogram option turn on then all latencies points need to be recorded.
The data can be viewed in in /proc/latency_hist/ .. In 2.6.22 there is
no way to reset the histograms for preempt off, or interrupts off
timing.
Daniel
next prev parent reply other threads:[~2007-10-30 21:38 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-30 21:26 CONFIG_CRITICAL_IRQSOFF_TIMING Gerrit Binnenmars
2007-10-30 21:32 ` Daniel Walker [this message]
-- strict thread matches above, loose matches on Subject: below --
2007-10-31 19:53 CONFIG_CRITICAL_IRQSOFF_TIMING Gerrit Binnenmars
2007-10-31 20:03 ` CONFIG_CRITICAL_IRQSOFF_TIMING Steven Rostedt
2007-10-30 21:46 CONFIG_CRITICAL_IRQSOFF_TIMING Gerrit Binnenmars
2007-10-30 21:09 CONFIG_CRITICAL_IRQSOFF_TIMING Gerrit Binnenmars
2007-10-30 21:05 ` CONFIG_CRITICAL_IRQSOFF_TIMING Daniel Walker
2007-10-30 20:52 CONFIG_CRITICAL_IRQSOFF_TIMING Gerrit Binnenmars
2007-10-30 20:56 ` CONFIG_CRITICAL_IRQSOFF_TIMING Daniel Walker
2007-10-31 0:17 ` CONFIG_CRITICAL_IRQSOFF_TIMING Steven Rostedt
2007-10-28 13:00 CONFIG_CRITICAL_IRQSOFF_TIMING Gerrit Binnenmars
2007-10-29 13:08 ` CONFIG_CRITICAL_IRQSOFF_TIMING Steven Rostedt
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