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 2b159ee38b2703c644a8f7218ec1ed0e4e300e8e..1a10b107f9886fb3c94d4eff8a631354f09b865f 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -25407,6 +25407,55 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>The current process limit.  Recorded once per UMA ping.</summary>
 </histogram>
 
+<histogram name="Memory.PurgeAndSuspend.BlinkGCKB" units="KB">
+  <owner>tasak@google.com</owner>
+  <summary>
+    The memory usage of the BlinkGC allocator after a background renderer is
+    purged and suspended. Note: this metric is for A/B testing.
+  </summary>
+</histogram>
+
+<histogram name="Memory.PurgeAndSuspend.DiscardableKB" units="KB">
+  <owner>tasak@google.com</owner>
+  <summary>
+    The memory usage of the discardable memory after a background renderer is
+    purged and suspended. Note: this metrics is for A/B testing.

[Ilya Sherman, 2016/10/11 21:28:56]

nit: s/metrics/metric (ditto for the other entries)

[tasak, 2016/10/12 07:37:23]

Done.

+  </summary>
+</histogram>
+
+<histogram name="Memory.PurgeAndSuspend.MallocMB" units="MB">
+  <owner>tasak@google.com</owner>
+  <summary>
+    The memory usage of the malloc after a background renderer is purged and
+    suspended. Note: this metrics is for A/B testing.
+  </summary>
+</histogram>
+
+<histogram name="Memory.PurgeAndSuspend.PartitionAllocKB" units="KB">
+  <owner>tasak@google.com</owner>
+  <summary>
+    The memory usage of PartitionAlloc after a background renderer is purged and
+    suspended. Note: this metrics is for A/B testing.
+  </summary>
+</histogram>
+
+<histogram name="Memory.PurgeAndSuspend.TotalAllocatedMB" units="MB">
+  <owner>tasak@google.com</owner>
+  <summary>
+    The sum of the memory usages of PartitionAlloc, malloc, discardable memory,
+    mainThreadIsolate() and BlinkGC allocator after a backgrounded renderer is
+    purged and suspended. Note: this metrics is for A/B testing.
+  </summary>
+</histogram>
+
+<histogram name="Memory.PurgeAndSuspend.V8MainThreadIsolateMB" units="MB">
+  <owner>tasak@google.com</owner>
+  <summary>
+    The memory usage of mainThreadIsolate() after a backgrounded renderer is
+    purged and suspended. Note: this metrics is for A/B testing.
+  </summary>
+</histogram>
+
 <histogram name="Memory.Renderer" units="KB">
   <owner>hajimehoshi@chromium.org</owner>
   <owner>kenjibaheux@google.com</owner>
@@ -108307,6 +108356,17 @@ value.
   <affected-histogram name="PLT.BeginToFinish_NormalLoad"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="PurgeAndSuspend" separator=".">
+  <suffix name="Enabled"/>
+  <suffix name="Disabled"/>

[Ilya Sherman, 2016/10/11 21:28:56]

I'm not sure what these are for.  Are these for the Finch study?  If so, they're
not needed -- that'll be available automatically on the dashboard.

When I suggested a histogram_suffixes element previously, I was thinking that
you could have a single <histogram> entry for "Memory.PurgeAndSuspend", and list
"DiscardableKB", "MallocKB", etc. as the suffixes.  But, now that you're using
KB in some places and MB in others, this probably doesn't make as much sense.

[tasak, 2016/10/12 07:37:23]

Yes. For the Finch study.
I see. I misunderstood... 
Done.

+  <affected-histogram name="Memory.PurgeAndSuspend.BlinkGCKB"/>
+  <affected-histogram name="Memory.PurgeAndSuspend.DiscardableKB"/>
+  <affected-histogram name="Memory.PurgeAndSuspend.MallocMB"/>
+  <affected-histogram name="Memory.PurgeAndSuspend.PartitionAllocKB"/>
+  <affected-histogram name="Memory.PurgeAndSuspend.TotalAllocatedMB"/>
+  <affected-histogram name="Memory.PurgeAndSuspend.V8MainThreadIsolateMB"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="QueryTimeSuffix" separator=".">
   <suffix name="0" label="N = 0"/>
   <suffix name="1" label="N = 1"/>