Lazily allocate DexCache arrays.

We rarely need the DexCache for compiled code.
Delay the allocation in hope we never need it.

This reduces DexCache memory usage by ~25% at startup.

Test: m test-art-host-gtest
Test: test.py -r -b --host
Change-Id: I680a59c905c2b821ee954e4b32abd5d24876bd11

1 files changed, 3 insertions, 2 deletions

diff --git a/runtime/class_linker_test.cc b/runtime/class_linker_test.cc
index c561c4d591..53908d8c0b 100644
--- a/runtime/class_linker_test.cc
+++ b/runtime/class_linker_test.cc
@@ -1544,8 +1544,9 @@ TEST_F(ClassLinkerTest, RegisterDexFileName) {
                                                         nullptr,
                                                         nullptr));
   // Make a copy of the dex cache with changed name.
-  LinearAlloc* alloc = Runtime::Current()->GetLinearAlloc();
-  dex_cache.Assign(class_linker->AllocAndInitializeDexCache(Thread::Current(), *dex_file, alloc));
+  dex_cache.Assign(class_linker->AllocAndInitializeDexCache(Thread::Current(),
+                                                            *dex_file,
+                                                            /* class_loader= */ nullptr));
   DCHECK_EQ(dex_cache->GetLocation()->CompareTo(location.Get()), 0);
   {
     WriterMutexLock mu(soa.Self(), *Locks::dex_lock_);