Update uid process state synchronously
ActivityTaskManagerService has a mirror ActiveUids. Originally it
may be updated to an intermediate state (e.g. UidRecord.reset) and
the uid state can be accessed before the actual value is set. That
leads to unexpected behavior depends on timing.
Now the mirror ActiveUids will only be updated when the actual uid
state is decided during updating oom-adj. And by acquiring window
manager's lock when updating oom-adj, it also synchronizes other
states with activity task manager. Although an additional lock is
held, it is possible to have benefit that reduces the frequency
of lock and unlock.
Also optimize the usage of priority booster by having an alias lock
with different type declaration, then the overhead of unnecessary
nested boost injections can be eliminated.
Bug: 123502026
Test: atest ActivityManagerServiceTest
Test: Manual measure until the last boot complete receiver is done:
- Invocation of nested priority boost
Reduce ~10000 times (50%, total 0.3s) boost invocation
- Invocation of updateOomAdjLocked
~170 times total reduces ~0.05s (only compare between with and
without global lock)
Change-Id: I160f951e103835401ccaaf7c732ba407e011c39b
9 files changed