tree b000aa1b4a54360db45436a9df872b034e36d79f
parent dc4f4d42aa1712a7ac2e4c24c0aebe58b71ae2c0
author Mathieu Chartier <mathieuc@google.com> 1468528203 -0700
committer Mathieu Chartier <mathieuc@google.com> 1469063130 -0700

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