commit 56fe25895e91d34a0a017429468829a20bdd5ae4
author Mathieu Chartier <mathieuc@google.com> Thu Jul 14 13:30:03 2016 -0700
committer Mathieu Chartier <mathieuc@google.com> Wed Jul 20 18:05:30 2016 -0700
tree b000aa1b4a54360db45436a9df872b034e36d79f
parent dc4f4d42aa1712a7ac2e4c24c0aebe58b71ae2c0

Add a way to measure read barrier slow paths

If enabled, this option counts number of slow paths, measures the
total slow path time per GC and records the info into a histogram.
Also added support for systrace to see which threads are performing
slow paths.

Added runtime option -Xgc:measure to enable. The info is dumped
for SIGQUIT.

Test: Volantis boot with CC, test-art-host with CC, run EEAC with CC
and -Xgc:measure

Bug: 30162165

Change-Id: I3c2bdb4156065249c45695f13c77c0579bc8e57a

runtime/gc/heap.h

diff --git a/runtime/gc/heap.h b/runtime/gc/heap.h
index 6fb048a..bb0d11a 100644
--- a/runtime/gc/heap.h
+++ b/runtime/gc/heap.h
@@ -182,6 +182,7 @@
        bool verify_pre_sweeping_rosalloc,
        bool verify_post_gc_rosalloc,
        bool gc_stress_mode,
+       bool measure_gc_performance,
        bool use_homogeneous_space_compaction,
        uint64_t min_interval_homogeneous_space_compaction_by_oom);