Describe performance monitoring in README.

README.md

 Mojo
 ====
 
 Mojo is an effort to extract a common platform out of Chrome's renderer and
 plugin processes that can support multiple types of sandboxed content, such as
 HTML, Pepper, or NaCl.
 
 ## Set-up and code check-out
 
 The instructions below only need to be done once. Note that a simple "git clone"
@@ skipping 89 matching lines @@
 Run a demo:
 ```
 out/Debug/mojo_shell mojo:spinning_cube
 ```
 
 Run the tests:
 ```
 mojo/tools/mojob.py test
 ```
 
+Run the benchmarks:
+```
+mojo/devtools/common/mojo_benchmark mojo/tools/data/benchmarks
+```
+
 Create a release build:
 ```
 mojo/tools/mojob.py gn --release
 mojo/tools/mojob.py build --release
 mojo/tools/mojob.py test --release
 ```
 
 ### Android
 
 To build for Android, first make sure that your checkout is [configured](#configure-android) to build
@@ skipping 162 matching lines @@
 for more detailed git instructions, including how to update your CL when you get
 review comments. There's a short tutorial that might be helpful to try before
 making your first change: [C++ in Chromium
 101](http://dev.chromium.org/developers/cpp-in-chromium-101-codelab).
 
 To land a change after receiving LGTM:
 ```
 $ git cl land
 ```
 
-Don't break the build! Waterfall is here:
-http://build.chromium.org/p/client.mojo/waterfall
+## Monitoring
+
+Our [waterfall](http://build.chromium.org/p/client.mojo/waterfall) continuously
+builds and tests the code. Don't break the build!
+
+### Benchmarks
+
+One of the bots, [Mojo Linux
+Perf](http://build.chromium.org/p/client.mojo/builders/Mojo%20Linux%20Perf) runs
+a [suite of benchmarks](mojo/tools/data/benchmarks) and uploads the results to
+the [performance dashboard](https://chromeperf.appspot.com/). You can browse the
+results [here](https://chromeperf.appspot.com/report), putting `mojo_benchmarks`
+as the "test suite".
+
+Automated alerts about performance regressions are sent to
+[mojo-perf-alerts@chromium.org](https://groups.google.com/a/chromium.org/forum/#!forum/mojo-perf-alerts).
+
+For examples of interesting sets of graphs see:
+
+ - [app
+   startup](https://chromeperf.appspot.com/report?sid=4848464df5ca8467770d80b309740ef56fbff00e773c2c53816fd8bff1fda1e0)
+ - [ipc
+   performance](https://chromeperf.appspot.com/report?sid=9abc20b46f6f8d908b0f07847f1d42eab54c7025a098336e6dc2d3e2030d66f8)