tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 8c2e4430cd9743a675273cbb408994ecd291232d..4e8493e655a2f2faf1836c544e132cc53448d871 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -56836,6 +56836,84 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>TBD</summary>
 </histogram>
 
+<histogram name="V8.WasmCompileFunctionMicroSeconds" units="microseconds">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>Time to compile a WebAssembly function in microseconds.</summary>
+</histogram>
+
+<histogram name="V8.WasmCompileFunctionPeakMemoryBytes" units="bytes">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>
+    Peak memory used to compile a WebAssembly function in bytes.
+  </summary>
+</histogram>
+
+<histogram name="V8.WasmCompileModuleMicroSeconds" units="microseconds">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>Time to compile a WebAssembly module in microseconds.</summary>
+</histogram>
+
+<histogram name="V8.WasmDecodeFunctionMicroSeconds" units="microseconds">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>Time to decode a WebAssembly function in microseconds.</summary>
+</histogram>
+
+<histogram name="V8.WasmDecodeModuleMicroSeconds" units="microseconds">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>Time to decode a WebAssembly module in microseconds.</summary>
+</histogram>
+
+<histogram name="V8.WasmDecodeModulePeakMemoryBytes" units="bytes">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>Peak memory used to decode a WebAssembly module in bytes.</summary>
+</histogram>
+
+<histogram name="V8.WasmFunctionSizeBytes" units="bytes">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>Size of a WebAssembly function in bytes.</summary>
+</histogram>
+
+<histogram name="V8.WasmFunctionsPerModule" units="functions">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>Function count in each WebAssembly module.</summary>
+</histogram>
+
+<histogram name="V8.WasmInstantiateModuleMicroSeconds" units="microseconds">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>Time to instantiate a WebAssembly module in microseconds.</summary>
+</histogram>
+
+<histogram name="V8.WasmMaxMemPagesCount" units="pages">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>
+    Maximum number of 64KiB pages needed by a WebAssembly module.

[Ilya Sherman, 2016/04/19 23:38:59]

Sorry, this is still not very clear to me.  Is this value recording the maximum
number of pages used by a single module, out of all of the modules (that is,
recording how hungry the single hungriest module is)?  Or is it recording the
maximum number of pages used by a module over that module's lifetime, one record
for each module?  When exactly is this sampled?

I guess my question boils down to: the word "maximum" implies that there's some
total space that's being sampled from, and I don't understand what that total
space is.

[bradn, 2017/02/02 00:08:45]

Reworded, hopefully clearer.

+  </summary>
+</histogram>
+
+<histogram name="V8.WasmMinMemPagesCount" units="pages">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>
+    Minimum number of 64KiB pages needed by a WebAssembly module.
+  </summary>
+</histogram>
+
+<histogram name="V8.WasmModuleSizeBytes" units="bytes">
+  <owner>bradnelson@chromium.org</owner>
+  <owner>titzer@chromium.org</owner>
+  <summary>Size of a WebAssembly module in bytes.</summary>
+</histogram>
+
 <histogram name="Variations.CreateTrials.SeedExpiry"
     enum="VariationsSeedExpiry">
   <owner>asvitkine@chromium.org</owner>