tree 043ef481eef7b7b9d4284860b58a66ef54b5ede6
parent 19921b70fef519c644d56a6aeb7f82491ba1850c
author Andreas Gampe <agampe@google.com> 1498188503 -0700
committer Andreas Gampe <agampe@google.com> 1498188503 -0700

ART: Change contention logging lock strategy

Compute possible contention (wrt/ sampling) first. Then keep the whole
logging section under the mutator lock *and* the thread-list lock so
as to avoid any thread races.

This change is in preparation for heavier logging under heavy lock
contention.

Enable contention logging in 004-ThreadStress.

Bug: 62353392
Test: m test-art-host
Change-Id: I7b9126bae273f0cddb681f5f013ce6d814c7b8c0