ahat: add support for diffing two heap dumps.
ahat now has the option to specify a --baseline hprof file to use as
the basis for comparing two heap dumps. When a baseline hprof file is
provided, ahat will highlight how the heap dump has changed relative
to the hprof file.
Differences that are highlighted include:
* overall heap sizes
* total bytes and number of allocations by type
* new and deleted instances of a given type
* retained sizes of objects
* instance fields, static fields, and array elements of modified objects
Also:
* Remove support for showing NativeAllocations, because I haven't ever
found it to be useful, it is not obvious what a "native" allocation
is, and I don't feel like adding diff support for them.
* Remove help page. Because it is outdated, not well maintained, and
not very helpful in the first place.
Test: m ahat-test
Test: Run in diff mode for tests and added new tests for diff.
Test: Manually run with and without diff mode on heap dumps from system server.
Bug: 33770653
Change-Id: Id9a392ac75588200e716bbc3edbae6e9cd97c26b
diff --git a/tools/ahat/src/DominatedList.java b/tools/ahat/src/DominatedList.java
index c884e7f..f73e3ca 100644
--- a/tools/ahat/src/DominatedList.java
+++ b/tools/ahat/src/DominatedList.java
@@ -19,6 +19,7 @@
import com.android.ahat.heapdump.AhatHeap;
import com.android.ahat.heapdump.AhatInstance;
import com.android.ahat.heapdump.AhatSnapshot;
+import com.android.ahat.heapdump.Sort;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;