Event Recording/CTF: Get closer to LTTNG output

[Ravindra Kumar Meena]

>
> the basic structure is now similar to the LTTNG output. The next step is
> to produce a packet header identical to LTTNG:
>
> trace {
>         major = 1;
>         minor = 8;
>         uuid = "6a7715d0-b502-4c65-8678-6777ac7f755a";
>         byte_order = le;
>         packet.header := struct {
>                 uint32_t magic;
>                 uint8_t  uuid[16];
>                 uint32_t stream_id;
>                 uint64_t stream_instance_id;
>         };
> };
>
I have added the ctf magic(0xC1FC1FC1) in header. I am facing difficulty in
adding uuid in header. uuid is 128 a bit number which has 5 octets of
8-4-4-4-12 bytes. So this is something i did:

#define UUID_octet_1 0x6a7715d0
#define UUID_octet_2 0xb502
#define UUID_octet_3 0x4c65
#define UUID_octet_4 0x8678
#define UUID_octet_5 0x6777ac7f755a

typedef struct bit_field
{
    unsigned x: 12; // 12 bits
} bit_field;

typedef struct ctf_uuid {
  uint32_t   octet1;
  uint16_t   octet2;
  uint16_t   octet3;
  uint16_t   octet4;
  bit_field  octet5;
} ctf_uuid;

The babeltrace has recognized the ctf magic number but not able to
recognize uuid. Is there something else method to add uuid in header?


> Move the generation of the metadata file to the record client.
>
> Generate the clock dynamically, e.g. the use the current CLOCK_REALTIME
> to set the offset.
>
> clock {
>         name = "monotonic";
>         uuid = "234d669d-7651-4bc1-a7fd-af581ecc6232";
>         description = "Monotonic Clock";
>         freq = 1000000000; /* Frequency, in Hz */
>         /* clock value offset from Epoch is: offset * (1/freq) */
>         offset = 1539783991179109789;
> };
>
> Add a LTTNG compatible packet context:
>
> struct packet_context {
>         uint64_clock_monotonic_t timestamp_begin;
>         uint64_clock_monotonic_t timestamp_end;
>         uint64_t content_size;
>         uint64_t packet_size;
>         uint64_t packet_seq_num;
>         unsigned long events_discarded;
>         uint32_t cpu_id;
> };
>
Okay


-- 
*Ravindra Kumar Meena*,
B. Tech. Computer Science and Engineering,
Indian Institute of Technology (Indian School of Mines)
<https://www.iitism.ac.in/>, Dhanbad
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