[lttng-dev] Monitor user space threads without user events

[lttng-dev] Monitor user space threads without user events

[Zvi Vered via lttng-dev]

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Hello,

My user space process contains 2 threads:

First thread is blocked upon a kernel event created by a hardware interrupt
handled by the kernel.
The  thread is sending ioctl which is blocked till this interrupt occurs.

Second thread has just a 5msec sleep. It does something and then sleeps for
5msec. Forever.

Is it possible to see when each thread is running (and not blocked or
sleeps) ?
I know how to do it with user events. I wonder if it's possible without any
extra code.

Thank you,
Zvika

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Re: [lttng-dev] Monitor user space threads without user events

[Kienan Stewart via lttng-dev]

Hi Zvika,

with a session that has kernel events enabled, I think you could use the 
sched_switch event.

thanks,
kienan

On 4/6/24 12:20 AM, Zvi Vered via lttng-dev wrote:
> Hello,
> 
> My user space process contains 2 threads:
> 
> First thread is blocked upon a kernel event created by a hardware 
> interrupt handled by the kernel.
> The  thread is sending ioctl which is blocked till this interrupt occurs.
> 
> Second thread has just a 5msec sleep. It does something and then sleeps 
> for 5msec. Forever.
> 
> Is it possible to see when each thread is running (and not blocked or 
> sleeps) ?
> I know how to do it with user events. I wonder if it's possible without 
> any extra code.
> 
> Thank you,
> Zvika
> 
> _______________________________________________
> lttng-dev mailing list
> lttng-dev@lists.lttng.org
> https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
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Re: [lttng-dev] Monitor user space threads without user events

[Zvi Vered via lttng-dev]

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Hi Kienan,

Thank you very much !
Zvika

On Mon, Apr 15, 2024 at 9:25 PM Kienan Stewart via lttng-dev <
lttng-dev@lists.lttng.org> wrote:

> Hi Zvika,
>
> with a session that has kernel events enabled, I think you could use the
> sched_switch event.
>
> thanks,
> kienan
>
> On 4/6/24 12:20 AM, Zvi Vered via lttng-dev wrote:
> > Hello,
> >
> > My user space process contains 2 threads:
> >
> > First thread is blocked upon a kernel event created by a hardware
> > interrupt handled by the kernel.
> > The  thread is sending ioctl which is blocked till this interrupt occurs.
> >
> > Second thread has just a 5msec sleep. It does something and then sleeps
> > for 5msec. Forever.
> >
> > Is it possible to see when each thread is running (and not blocked or
> > sleeps) ?
> > I know how to do it with user events. I wonder if it's possible without
> > any extra code.
> >
> > Thank you,
> > Zvika
> >
> > _______________________________________________
> > lttng-dev mailing list
> > lttng-dev@lists.lttng.org
> > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
> _______________________________________________
> lttng-dev mailing list
> lttng-dev@lists.lttng.org
> https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
>

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