commit 37ac064b0e1f0931c85499427634fbc9df77eeb6
author Daniele Di Proietto <ddiproietto@google.com> Thu Oct 21 15:10:19 2021 +0100
committer Daniele Di Proietto <ddiproietto@google.com> Thu Nov 11 14:59:19 2021 +0000
tree 0533be6962d0dd209819d72a5119161e1f40a160
parent f35086000666f0fdaed06f43329480de3c187e06

heap_graph_tracker: Native size in flamegraph

Since r.android.com/194395971, trace_processor understands the native
size for certain objects (if the trace is from an Android T+ device).

This commit displays the native size of those objects in the flamegraph,
as an extra child node.

Bug: 194395971
Change-Id: I072feab99ee2b8ba04b2c0b215b46c8ee3e0dbf2

docs/data-sources/java-heap-profiler.md

diff --git a/docs/data-sources/java-heap-profiler.md b/docs/data-sources/java-heap-profiler.md
index f03977e..1187b7a 100644
--- a/docs/data-sources/java-heap-profiler.md
+++ b/docs/data-sources/java-heap-profiler.md
@@ -21,6 +21,10 @@
 
 ![Flamegraph of a Java heap profiler](/docs/images/java-flamegraph.png)
 
+The native size of certain objects is represented as an extra child node in the
+flamegraph, prefixed with "[native]". The extra node counts as an extra object.
+This is available only on Android T+.
+
 ## SQL
 
 Information about the Java Heap is written to the following tables:
@@ -29,6 +33,9 @@
 * [`heap_graph_object`](/docs/analysis/sql-tables.autogen#heap_graph_object)
 * [`heap_graph_reference`](/docs/analysis/sql-tables.autogen#heap_graph_reference)
 
+`native_size` (available only on Android T+) is extracted from the related
+`libcore.util.NativeAllocationRegistry` and is not included in `self_size`.
+
 For instance, to get the bytes used by class name, run the following query.
 As-is this query will often return un-actionable information, as most of the
 bytes in the Java heap end up being primitive arrays or strings.