Commits on Aug 23, 2017

1. 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.

   

   jasnell committed Aug 23, 2017
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