ocaml/tools/eventlog_metadata.in

/* CTF 1.8 */

typealias integer {size = 8;}  := uint8_t;
typealias integer {size = 16;} := uint16_t;
typealias integer {size = 32;} := uint32_t;
typealias integer {size = 64;} := uint64_t;

clock {
    name = tracing_clock;
    freq = 1000000000; /* tick = 1 ns */
};

typealias integer {
    size = 64;
    map = clock.tracing_clock.value;
} := tracing_clock_int_t;


/*

Main trace description,
major and minor refers to the CTF version being used.

The packet header must contain at the very least
a stream id and the CTF magic number.
We only use one stream for now, and CTF magic number is 0xc1fc1fc1.

We add an extra field ocaml_trace_version to enable simpler transition if we add
or remove metrics in the future.

*/
trace {
    major = 1;
    minor = 8;
    byte_order = @endianness@;
    packet.header := struct {
        uint32_t magic; /* required: must contain CTF magic number */
        uint16_t ocaml_trace_version; /* our own trace format versioning */
        uint16_t stream_id; /* required, although we have only one. */
    };
};

/*

We use only one stream at the moment.
Each event payload must contain a header with a timestamp and a pid.
The id field refers to the various event kinds defined further down this file.

*/
stream {
    id = 0;
    event.header := struct { /* for each event */
        tracing_clock_int_t timestamp;
        uint32_t pid;
        uint32_t id;
    };
};

/*

These enumerations are mostly following the instrumented runtime datapoints.
gc_phase aims to track the entry and exit time of each of the following events
during collection.

*/
enum gc_phase : uint16_t {
    "compact/main" = 0,
    "compact/recompact",
    "explicit/gc_set",
    "explicit/gc_stat",
    "explicit/gc_minor",
    "explicit/gc_major",
    "explicit/gc_full_major",
    "explicit/gc_compact",
    "major",
    "major/roots",
    "major/sweep",
    "major/mark/roots",
    "major/mark/main",
    "major/mark/final",
    "major/mark",
    "major/mark/global_roots_slice",
    "major_roots/global",
    "major_roots/dynamic_global",
    "major_roots/local",
    "major_roots/C",
    "major_roots/finalised",
    "major_roots/memprof",
    "major_roots/hook",
    "major/check_and_compact",
    "minor",
    "minor/local_roots",
    "minor/ref_tables",
    "minor/copy",
    "minor/update_weak",
    "minor/finalized",
    "explicit/gc_major_slice"
};

/*

Miscellaneous GC counters

*/
enum gc_counter : uint16_t {
    "alloc_jump",
    "force_minor/alloc_small",
    "force_minor/make_vect",
    "force_minor/set_minor_heap_size",
    "force_minor/weak",
    "force_minor/memprof",
    "major/mark/slice/remain",
    "major/mark/slice/fields",
    "major/mark/slice/pointers",
    "major/work/extra",
    "major/work/mark",
    "major/work/sweep",
    "minor/promoted",
    "request_major/alloc_shr",
    "request_major/adjust_gc_speed",
    "request_minor/realloc_ref_table",
    "request_minor/realloc_ephe_ref_table",
    "request_minor/realloc_custom_table"
};

/*

Block allocation counters, per size buckets.

*/
enum alloc_bucket : uint8_t {
  "alloc 01" = 1,
  "alloc 02",
  "alloc 03",
  "alloc 04",
  "alloc 05",
  "alloc 06",
  "alloc 07",
  "alloc 08",
  "alloc 09",
  "alloc 10-19",
  "alloc 20-29",
  "alloc 30-39",
  "alloc 40-49",
  "alloc 50-59",
  "alloc 60-69",
  "alloc 70-79",
  "alloc 80-89",
  "alloc 90-99",
  "alloc large"
};

/*

Each event is comprised of the previously defined event.header
and the fields defined here.

An entry event marks the start of a gc phase.

*/
event {
    id = 0;
    name = "entry";
    stream_id = 0;
    fields := struct {
        enum gc_phase phase;
    };
};

/*

exit counterparts to entry events

*/
event {
    id = 1;
    name = "exit";
    stream_id = 0;
    fields := struct {
        enum gc_phase phase;
    };
};

event {
    id = 2;
    name = "counter";
    stream_id = 0;
    fields := struct {
        uint64_t count;
        enum gc_counter kind;
    };
};

event {
    id = 3;
    name = "alloc";
    stream_id = 0;
    fields := struct {
        uint64_t count;
        enum alloc_bucket bucket;
    };
};

/*
 Flush events are used to track the time spent by the tracing runtime flushing
 data to disk, useful to remove flushing overhead for other runtime mesurements
 in the trace.
*/
event {
     id = 4;
     name = "flush";
     stream_id = 0;
     fields := struct {
        tracing_clock_int_t duration;
     };
};