On 22/07/2019 07:47, Ravindra Kumar Meena wrote:
*Plan of the week:*
Last week I added packet.header, packet.context, event.header, env
object in the metadata. I will continue to work on adding event object
in the metadata.
I have added the few parts of the sched_switch event.
https://github.com/rmeena840/rtems-tools/commit/7b1488364b86df5ec956bd787dc8eeea01c28a8f
https://github.com/rmeena840/rtems-tools/commit/cd969dfde62966c4f99c26973620852dafc0f47f
Have a look
I had a look at trace compass examples. The possible values of the state
in sched_switch event is 0, 1 and 1026 but mostly it is 0 or1. There is
no fixed pattern I found in the example.
Where did you find what?
I found:
event {
name = "sched_switch";
id = 22;
stream_id = 0;
fields := struct {
integer { size = 8; align = 8; signed = 0; encoding = UTF8; base = 10;
} _prev_comm[16];
integer { size = 32; align = 8; signed = 1; encoding = none; base =
10; } _prev_tid;
integer { size = 32; align = 8; signed = 1; encoding = none; base =
10; } _prev_prio;
integer { size = 64; align = 8; signed = 1; encoding = none; base =
10; } _prev_state;
integer { size = 8; align = 8; signed = 0; encoding = UTF8; base = 10;
} _next_comm[16];
integer { size = 32; align = 8; signed = 1; encoding = none; base =
10; } _next_tid;
integer { size = 32; align = 8; signed = 1; encoding = none; base =
10; } _next_prio;
};
};
in
"TraceCompassTutorialTraces/102-tracing-wget-critical-path/wget-second-call/metadata".
I think the analysis tools learns the id from the event name, see
"lttng-track-process" in lttng-analyses.
Can you please align all the metadata exactly with the way things are
defined in LTTNG.
There is one problem here we need the next_comm and next_tid value
before actually next record item is generated in client-side.
You need one sched_switch event per processor. The order of record
events is fixed. You update the sched_switch event in two steps and
write it to the stream after the second step.
--
Sebastian Huber, embedded brains GmbH
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