tree c3af4e8008e8214016b88bb9127157c912fa23e8
parent b885d8b631ad0a72ade32cb6b07a2ddd062a664b
author Lokesh Gidra <lokeshgidra@google.com> 1578351964 -0800
committer Lokesh Gidra <lokeshgidra@google.com> 1579117846 +0000

Utilize partially used TLABs

Currently, once a mutator tries to allocate an object bigger than the
TLAB size, it attempts to acquire another TLAB. The previous TLAB is not
utilized again. This leads to blocking GCs when mutators get created and
killed very frequently, as could happen in the case of Zygote.

In this change, we maintain a separate list of partially used TLABs
which can be reused whenever any mutator attempts to allocate a new TLAB
from region space.

Test: forrest hermatic test
Bug: 146706834
Change-Id: I8076663628e49fc10e33f30de937833f6812fdca