tree ea74f6947c5c6caaaf7a6fb3ece3369aec3a62c3
parent c5f41cd1a39472dbe2480c09a1ce20aeced2a9f6
author David Srbecky <dsrbecky@google.com> 1638378548 +0000
committer David Srbecky <dsrbecky@google.com> 1642284292 +0000

Add thread-shared interpreter cache

The thread-local interpreter cache handles around 75% of method/field
lookups from the interpreter.

Add thread-shared interpreter cache which can be much bigger (since
we pay the memory just once rather then per thread).  This increases
the cache hit rate to 90%.

This effectively halves the amount of time we spend in
'NterpGetMethod' (including DexCache lookups), which is the single
most expensive method during startup.

Furthermore, it also reduces the amount of time we spend resolving
methods by around 25% since DexCache entries get evicted less often.

The shared cache increases memory use by 256k per process, so also
reduce the fixed-size DexCache fields array, which balances it back.

Test: test.py --host
Change-Id: I3cd369613d47de117ab69d5bee00d4cf89b87913