GSoC Project | Basic Support for Trace Compass

[Sebastian Huber]

On 18/07/2019 07:38, Ravindra Kumar Meena wrote:
> Hi,
> 
> I am facing difficulty in adding event.header in client-side.
> 
> struct event_header_compact {
> enum : uint5_t { compact = 0 ... 30, extended = 31 } id;
> variant <id> {
> struct {
> uint27_clock_monotonic_t timestamp;
> } compact;
> struct {
> uint32_t id;
> uint64_clock_monotonic_t timestamp;
> } extended;
> } v;
> } align(8);
> 
> This is what I have tried.
> 
> https://github.com/rmeena840/rtems-tools/commit/b2ffc3d5b5ffd97075f1ed9028bcb8098e241e2b
> 
> Have a look. Please don't build it it's not working yet.

I would use two structures for this in C, one for the compact header and 
one for the large header. I would not use bit fields in C.

You have to figure out how the 27-bit timestamp works. It must relative 
to some reference point.

How is the id used? We are interested in the sched_switch events.

-- 
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
PGP     : Public key available on request.

Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.