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trace: Use User Statically-Defined Tracepoints to emit tracing spans

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Christian Decker 2023-07-27 14:47:22 +09:30 • committed by Rusty Russell
parent 039aaaf777
commit ca808b8476
1 changed files with 9 additions and 3 deletions
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12
common/trace.c
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@ -13,6 +13,8 @@
#include <stdio.h>
#if HAVE_USDT
#include <sys/sdt.h>
#define MAX_ACTIVE_SPANS 128
#define SPAN_ID_LEN 33
@ -110,7 +112,7 @@ static void trace_emit(struct span *s)
trace_span_id_serialize(s, id);
tal_append_fmt(&res, "}, \"traceId\": \"%.*s\"}]", 16, id);
fprintf(stderr, "%s\n", res);
DTRACE_PROBE2(lightningd, span_emit, id, res);
tal_free(res);
}
@ -145,6 +147,7 @@ void trace_span_start(const char *name, const void *key)
s->tags = notleak(tal_arr(NULL, struct span_tag, 0));
s->name = notleak(tal_strdup(NULL, name));
current = s;
DTRACE_PROBE1(lightningd, span_start, s->id);
}
void trace_span_end(const void *key)
@ -156,6 +159,7 @@ void trace_span_end(const void *key)
struct timeabs now = time_now();
s->end_time = (now.ts.tv_sec * 1000000) + now.ts.tv_nsec / 1000;
DTRACE_PROBE1(lightningd, span_end, s->id);
trace_emit(s);
/* Reset the context span we are in. */
@ -179,15 +183,17 @@ void trace_span_tag(const void *key, const char *name, const char *value)
void trace_span_suspend(const void *key)
{
size_t numkey = trace_key(key);
struct span *span = trace_span_find(numkey);
current = NULL;
fprintf(stderr, "spanSuspend-%s (%p)\n", "???", key);
DTRACE_PROBE1(lightningd, span_suspend, span->id);
}
void trace_span_resume(const void *key)
{
size_t numkey = trace_key(key);
current = trace_span_find(numkey);
fprintf(stderr, "spanResume-%s (%p)\n", "???", key);
DTRACE_PROBE1(lightningd, span_resume, current->id);
}
#else /* HAVE_USDT */