GSoC Project | Basic Support for Trace Compass

[Sebastian Huber]

On 25/07/2019 09:24, Ravindra Kumar Meena wrote:
>      >
>     https://github.com/rmeena840/rtems-tools/commit/f7838f156006064ffc53b1b1d3fb01f80ef15ae4
> 
> 
>     No, sorry, this is not what we need. Maybe you should delete this code
>     part and start from scratch.
> 
>     We process record events and produce LTTNG events. Is this clear?
> 
>     Your task is:
> 
>     1. Gather the information from two record events
>     (RTEMS_RECORD_THREAD_SWITCH_OUT and RTEMS_RECORD_THREAD_SWITCH_IN) with
>     the same timestamp on the same CPU.
> 
> A CPU can have many records events. Since RTEMS_RECORD_THREAD_SWITCH_IN 
> is received after RTEMS_RECORD_THREAD_SWITCH_OUT we can just directly 
> write into corresponding CPU file after receiving 
> RTEMS_RECORD_THREAD_SWITCH_IN for the same timestamp.

Yes.

All the record handling must be done per CPU.

> 
> 
>     2. Once you gathered the information of two events that meet this
>     criteria, you produce exactly one LTTNG sched_switch event.
> 
>   Okay. So this particular lttng sched_switch will have prev_* value 
> as RTEMS_RECORD_THREAD_SWITCH_OUT data and next_* value 
> as RTEMS_RECORD_THREAD_SWITCH_IN.

Yes.

-- 
Sebastian Huber, embedded brains GmbH

Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone   : +49 89 189 47 41-16
Fax     : +49 89 189 47 41-09
E-Mail  : sebastian.huber at embedded-brains.de
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