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/runtime.cc

diff --git a/runtime/runtime.cc b/runtime/runtime.cc
index 21cd2aa..079c079 100644
--- a/runtime/runtime.cc
+++ b/runtime/runtime.cc
@@ -989,6 +989,7 @@
                        xgc_option.verify_pre_sweeping_rosalloc_,
                        xgc_option.verify_post_gc_rosalloc_,
                        xgc_option.gcstress_,
+                       xgc_option.measure_,
                        runtime_options.GetOrDefault(Opt::EnableHSpaceCompactForOOM),
                        runtime_options.GetOrDefault(Opt::HSpaceCompactForOOMMinIntervalsMs));