linux-kernel - Re: [RFD 0/5] Add latency histogram

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Message-ID: <554345E6.7040005@monom.org>
Date:	Fri, 01 May 2015 09:22:46 +0000
From:	Daniel Wagner <wagi@...om.org>
To:	Tom Zanussi <tom.zanussi@...ux.intel.com>,
	Daniel Wagner <daniel.wagner@...-carit.de>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	Carsten Emde <C.Emde@...dl.org>,
	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFD 0/5] Add latency histogram

Hi Tom,

On 05/01/2015 01:52 AM, Tom Zanussi wrote:
> Hi Daniel,
>
> On Thu, 2015-04-30 at 12:06 +0200, Daniel Wagner wrote:
>> Hi,
>>
>> I would like to discuss a possible way of getting the feature of the
>> latecy_hist.patch [1] added to mainline.
>>
>> "Latency histograms are primarily relevant in the context of real-time
>> enabled kernels (CONFIG_PREEMPT/CONFIG_PREEMPT_RT)and are used in the
>> quality management of the Linux real-time capabilities."
>>
>> Steven pointed out that this might be doable based on Tom Zanussi's
>> "[PATCH v4 0/7] tracing: 'hist' triggers" [2].
>>
>> Here are my findings. It was not too complicated to get it working,
>> though I had to add some hacks. I have added comments to each patch.
>>
>
> It looks like you were able to do quite a bit here with not much code -
> nice!

Thanks :)

> Just FYI, I'll be working on a v5 of the hist triggers patchset that
> will incorporate the stuff from patch 1 (needs to be split into a
> separate patch for the triggers code already upstream, and one for hist
> triggers) and your comments from patch 2 (see comments in my reply to
> that patch), along with  a couple other unrelated changes...

Great to hear!

cheers,
daniel

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