perf_hooks: implementation of the perf timing API

An initial implementation of the Performance Timing API for Node.js.
This is the same Performance Timing API implemented by modern browsers
with a number of Node.js specific properties. The User Timing mark()
and measure() APIs are implemented, garbage collection timing, and
node startup milestone timing.

```js
const { performance } = require('perf_hooks');

performance.mark('A');
setTimeout(() => {
  performance.mark('B');
  performance.measure('A to B', 'A', 'B');
  const entry = performance.getEntriesByName('A to B', 'measure')[0];
  console.log(entry.duration);
}, 10000);
```

The implementation is at the native layer and makes use of uv_hrtime().
This should enable *eventual* integration with things like Tracing
and Inspection.

The implementation is extensible and should allow us to add new
performance entry types as we go (e.g. for measuring i/o perf,
etc).

Documentation and a test are provided.

PR-URL: https://github.com/nodejs/node/pull/14680
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/node_internals.h b/src/node_internals.h
index 5d437fa302..1e099325a3 100644
--- a/src/node_internals.h
+++ b/src/node_internals.h
@@ -30,6 +30,7 @@
 #include "uv.h"
 #include "v8.h"
 #include "tracing/trace_event.h"
+#include "node_perf_common.h"
 #include "node_debug_options.h"
 
 #include <stdint.h>