Re: [diamon-discuss] Diamon Meeting on Tuesday February 9th, 2016, at 11h EDT (15h UTC)

On Thu, Feb 18, 2016 at 2:44 PM, Mathieu Desnoyers
<[email protected]> wrote:
> Adding Alexei and Brendan in CC, they will likely be interested
> in the eBPF discussion.

yep :)
please cc iovisor-dev as well for ideas you guys have around
making use of bpf kernel bits with 'latency-tracker'.

> ----- On Feb 17, 2016, at 11:41 PM, Julien Desfossez [email protected] wrote:
>
>> Hi,
>>
>> We are currently setting up a place on the diamon website so we can
>> upload the slides, I will send the link soon.
>>
>> Regarding the mainlining, we intend to push this projet upstream. Before
>> that, we are working on more measurements/benchmarks, stability testing
>> and usability improvements.
>>
>> Also, one things that we would like to investigate before sending the
>> patches is the possibility of using eBPF/bcc to handle the probes while
>> keeping the latency-tracker as the backend to keep the state and all the
>> more advanced interactions with the kernel. That way, we could combine
>> the flexibility/safety of eBPF and the efficiency of the
>> latency-tracker.
>>
>> Thanks for your feedback, I will keep this list updated of the progress
>> we make on that front.
>>
>> Julien
>>
>> On 14-Feb-2016 11:37:44 AM, Al Grant wrote:
>>> Hi,
>>>
>>> I have read the blog and this looks a very useful technique but unfortunately I
>>> couldn't make the call.  Are slides/minutes available?
>>>
>>> My main question is not actually technical - it's about the prospects for
>>> getting
>>> this into mainline Linux.
>>>
>>> Thanks,
>>>
>>> Al
>>>
>>>
>>> > -----Original Message-----
>>> > From: [email protected] [mailto:diamon-
>>> > [email protected]] On Behalf Of Julien Desfossez
>>> > Sent: 08 February 2016 19:14
>>> > To: Mathieu Desnoyers
>>> > Cc: [email protected]
>>> > Subject: Re: [diamon-discuss] Diamon Meeting on Tuesday February 9th, 2016,
>>> > at 11h EDT (15h UTC)
>>> >
>>> > Hi,
>>> >
>>> > Here is the information for tomorrow's call:
>>> > February 9th, 2016, at 11h EDT (15h UTC)
>>> >
>>> > Conference: 415-906-5657 PIN: 88326
>>> > URL for the screen sharing: www.uberconference.com/mdolan
>>> >
>>> > Local International phone numbers are available at:
>>> > https://www.uberconference.com/international
>>> >
>>> > Please note anyone dialing using the international numbers need to dial the
>>> > local international number for the country they are in, then enter the US
>>> > conference number (4159065657), and then enter the PIN (88326).
>>> >
>>> > Julien
>>> >
>>> > On 28-Jan-2016 08:08:45 PM, Mathieu Desnoyers wrote:
>>> > > Hi,
>>> > >
>>> > > Following the blog post published two weeks ago [1], we would like to
>>> > > propose organizing a phone meeting with all interested members of this
>>> > > workgroup on February 9th to gather feedback and ideas for improvement
>>> > > on the subject of measuring and detecting high response time.
>>> > >
>>> > > At EfficiOS, we have developed a kernel module for monitoring at
>>> > > run-time the delay between the moment the kernel starts processing an
>>> > > interrupt
>>> > > (do_IRQ) and the moment the target task gets scheduled in or has
>>> > > finished processing the data.
>>> > >
>>> > > When a high latency is detected, it emits a tracepoint event and can
>>> > > wakeup a user-space script to take arbitrary actions as soon as
>>> > > possible.
>>> > >
>>> > > The main intent is to provide an entry point in a kernel trace. After
>>> > > that, everyone has their own methodology to process the trace. The
>>> > > blog post illustrates what we can do with LTTng as an example but the
>>> > > detection and triggers are not coupled with any tracer.
>>> > >
>>> > > The proposed agenda is a discussion around these points:
>>> > > - presentation of the scope of the problem
>>> > > - limitation of the current tools
>>> > > - overview of the latency_tracker module applied for this use-case
>>> > > -- current state
>>> > > -- use-cases
>>> > > -- future plans
>>> > > - from the audience: comments, ideas, other approaches, etc.
>>> > >
>>> > > If you have other points you would like to discuss around this
>>> > > subject, please let me know and I will add them.
>>> > >
>>> > > Also, if you wish to attend but can't make it at the proposed date and
>>> > > time, let us know.
>>> > >
>>> > > The details for the conference call will be sent soon.
>>> > >
>>> > > Thanks,
>>> > >
>>> > > Julien & Mathieu
>>> > >
>>> > > [1] https://lttng.org/blog/2016/01/06/monitoring-realtime-latencies/
>>> > >
>>> > > --
>>> > > Mathieu Desnoyers
>>> > > EfficiOS Inc.
>>> > > http://www.efficios.com
>>> > _______________________________________________
>>> > diamon-discuss mailing list
>>> > [email protected]
>>> > https://lists.linuxfoundation.org/mailman/listinfo/diamon-discuss
>>>
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>
> --
> Mathieu Desnoyers
> EfficiOS Inc.
> http://www.efficios.com