linux-kernel - Re: [PATCH] hwlat_detector: Detect hardware-induced latencies

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Message-ID: <552B7EE2.1090005@monom.org>
Date:	Mon, 13 Apr 2015 10:31:30 +0200
From:	Daniel Wagner <wagi@...om.org>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Carsten Emde <C.Emde@...dl.org>
CC:	Daniel Wagner <daniel.wagner@...-carit.de>,
	linux-rt-users@...r.kernel.org, Jon Masters <jcm@...hat.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-kernel@...r.kernel.org,
	Tom Zanussi <tom.zanussi@...ux.intel.com>
Subject: Re: [PATCH] hwlat_detector: Detect hardware-induced latencies

Hi,

On 04/09/2015 04:10 PM, Steven Rostedt wrote:
> On Thu, 09 Apr 2015 15:46:12 +0200
> Carsten Emde <C.Emde@...dl.org> wrote:
> 
>> Hi Daniel,
>>
>>> BTW, are you also taking care of the latency-hist.patch patch?
>> I do.
>>
>> However, the request (and the challenge) is not to simply rewrite the 
>> code. The idea is to provide a general histogram framework that can be 
>> used from anywhere in the kernel and to equip it with everything needed 
>> by the existing histograms. This framework should no longer be part of 
>> the RT patches but submitted directly to mainline Linux. In a second 
>> step, we will then rewrite the existing histogram code to use the new 
>> framework.
>>
>> Any help is greatly appreciated!

I'll start poking around then :)

> Hmm, Currently Tom Zanussi is working on a hist trigger for tracing.
> Not sure it can be used here, but perhaps ideas can be spawned.
> 
> http://marc.info/?l=linux-kernel&m=142807630917288

>From a quick look, it should be possible to add on top of those patches
the two TRACE_EVENTs (preemptirqsoff_hist, hrtimer_interrupt), annotate
start_critical_*() & and friends (from latency-hist.patch). I'll try
that and see what explodes.

cheers,
daniel
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