GSoC Project | Basic Support for Trace Compass

[Sebastian Huber]

On 16/07/2019 10:41, Ravindra Kumar Meena wrote:
>     Yes, the values are there, but babeltrace cannot deduce the clock
>     source. In the LTTNG it displays it like this:
> 
>     [17:50:44.093076317] (+0.000002071)
> 
> Okay. The timestamp_begin and timestamp_end member in packet.context are 
> for the whole recording process.
> 
> The timestamp_begin means first record item recorded in the whole 
> process per CPU.
> The timestamp_end means the last record item recorded in the whole 
> process per CPU.
> 
> So I moved the timestamp value of individual record item in event.header
> 
> https://github.com/rmeena840/rtems-tools/commit/0542b83c5f28ad2d005e8c0d86c0f4a13d43fee9
> 
> Now, babeltrace is able to print timestamp value now.
> 
> It looks like this:
> 
> babeltrace . | head
> 
> [19:16:31.180116542] (+0.000000000) Record_Item RTEMS_RECORDING_EVENT: { 
> cpu_id = 17 }, { events = ( "RTEMS_RECORD_THREAD_STACK_CURRENT" : 
> container = 209 ), data = 5856 }
> [19:16:31.180116542] (+0.000000000) Record_Item RTEMS_RECORDING_EVENT: { 
> cpu_id = 17 }, { events = ( "RTEMS_RECORD_THREAD_SWITCH_IN" : container 
> = 215 ), data = 151060500 }
> [19:16:31.180154588] (+0.000038046) Record_Item RTEMS_RECORDING_EVENT: { 
> cpu_id = 17 }, { events = ( "RTEMS_RECORD_THREAD_SWITCH_OUT" : container 
> = 216 ), data = 151060500 }
> [19:16:31.180154588] (+0.000000000) Record_Item RTEMS_RECORDING_EVENT: { 
> cpu_id = 17 }, { events = ( "RTEMS_RECORD_THREAD_STACK_CURRENT" : 
> container = 209 ), data = 7392 }
> [19:16:31.180154588] (+0.000000000) Record_Item RTEMS_RECORDING_EVENT: { 
> cpu_id = 17 }, { events = ( "RTEMS_RECORD_THREAD_SWITCH_IN" : container 
> = 215 ), data = 167837739 }
> [19:16:31.180174232] (+0.000019644) Record_Item RTEMS_RECORDING_EVENT: { 
> cpu_id = 17 }, { events = ( "RTEMS_RECORD_THREAD_SWITCH_OUT" : container 
> = 216 ), data = 167837739 }
> [19:16:31.180174232] (+0.000000000) Record_Item RTEMS_RECORDING_EVENT: { 
> cpu_id = 17 }, { events = ( "RTEMS_RECORD_THREAD_STACK_CURRENT" : 
> container = 209 ), data = 5856 }

Very good, please change now the format of the event header to the one 
used by LTTNG:

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);

-- 
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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