tree 509c9e3b79448038e7263c147fdcc3fde7708cc6
parent 212ec8f32919d50a1e1cb7ea4b3b91ca938ae4e6
author Jeff Hao <jeffhao@google.com> 1376695638 -0700
committer Jeff Hao <jeffhao@google.com> 1376697424 -0700

Clean up sampling tracing.

- Moved maps to fields within thread.
- Created temp trace field to lessen amount of traces allocated and freed.

Change-Id: I23fe25a85ad2894cc6917f87d4046cdececf0739