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UserspaceEmulator: Make generated profiles debugable with cli tools

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The fact that profiles are json on one giant line makes them very
difficult to debug when things go wrong. Instead make sure to wrap
each event or sample on a newline so you can easily grep/heap/tail
the profile files.
This commit is contained in:
Brian Gianforcaro 2021-08-28 04:31:08 -07:00 • committed by Andreas Kling
parent 74c3359bed
commit e00c871f65
1 changed files with 2 additions and 1 deletions
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3
Userland/DevTools/UserspaceEmulator/Emulator.cpp
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@ -476,7 +476,7 @@ void Emulator::emit_profile_sample(AK::OutputStream& output)
gettimeofday(&tv, nullptr);
builder.appendff(R"~(, {{"type": "sample", "pid": {}, "tid": {}, "timestamp": {}, "lost_samples": 0, "stack": [)~", getpid(), gettid(), tv.tv_sec * 1000 + tv.tv_usec / 1000);
builder.join(',', raw_backtrace());
builder.append("]}");
builder.append("]}\n");
output.write_or_error(builder.string_view().bytes());
}
@ -486,6 +486,7 @@ void Emulator::emit_profile_event(AK::OutputStream& output, StringView event_nam
timeval tv {};
gettimeofday(&tv, nullptr);
builder.appendff(R"~(, {{"type": "{}", "pid": {}, "tid": {}, "timestamp": {}, "lost_samples": 0, "stack": [], {}}})~", event_name, getpid(), gettid(), tv.tv_sec * 1000 + tv.tv_usec / 1000, contents);
builder.append('\n');
output.write_or_error(builder.string_view().bytes());
}