RFR: 8319947: Recursive lightweight locking: s390x implementation [v6]

[Amit Kumar]

> s390x port for recursive locking. 
> 
> testing:
> - [x] build fastdebug-vm
> - [x] build slowdebug-vm
> - [x] build release-vm
> - [x] build optimized-vm
> - [x] ./test/jdk/java/util/concurrent (fastdebug-vm)
>   - [x] with C1
>   - [x] with C2
>   - [x] with interpreter 
> - [x] ./test/jdk/java/util/concurrent (release-vm)
>   - [x] with C1
>   - [x] with C2
>   - [x] with interpreter 
> - [x] ./test/jdk/java/util/concurrent (slowdebug-vm)
>   - [x] with C1
>   - [x] with C2
>   - [x] with interpreter
> - [x] tier1 with fastdebug-vm 
> - [x] tier1 with slowdebug-vm
> - [x] tier1 with release-vm
> 
> *BenchMarks*:
> 
> Results from Performance LPARs : 
> 
> 
> Locking Mode = 1 (without Patch)
> 
> Benchmark                                (innerCount)  Mode  Cnt     Score    Error  Units
> LockUnlock.testContendedLock                      100  avgt   12     5.144 ±  0.035  ns/op
> LockUnlock.testRecursiveLockUnlock                100  avgt   12  3824.742 ± 89.475  ns/op
> LockUnlock.testRecursiveSynchronization           100  avgt   12    25.348 ±  0.559  ns/op
> LockUnlock.testSerialLockUnlock                   100  avgt   12   466.629 ±  3.036  ns/op
> LockUnlock.testSimpleLockUnlock                   100  avgt   12   468.532 ±  1.793  ns/op
> Finished running test 'micro:vm.lang.LockUnlock'
> 
> Locking Mode = 1 (with patch)
> 
> Benchmark                                (innerCount)  Mode  Cnt     Score    Error  Units
> LockUnlock.testContendedLock                      100  avgt   12     5.146 ±  0.027  ns/op
> LockUnlock.testRecursiveLockUnlock                100  avgt   12  3833.175 ± 75.863  ns/op
> LockUnlock.testRecursiveSynchronization           100  avgt   12    25.206 ±  0.519  ns/op
> LockUnlock.testSerialLockUnlock                   100  avgt   12   473.973 ±  2.103  ns/op
> LockUnlock.testSimpleLockUnlock                   100  avgt   12   470.749 ±  2.229  ns/op
> Finished running test 'micro:vm.lang.LockUnlock'
> 
> 
> 
> 
> Locking Mode = 2  (without Patch)
> 
> Benchmark                                (innerCount)  Mode  Cnt      Score    Error  Units
> LockUnlock.testContendedLock                      100  avgt   12      4.688 ±  0.051  ns/op
> LockUnlock.testRecursiveLockUnlock                100  avgt   12  12800.544 ± 92.265  ns/op
> LockUnlock.testRecursiveSynchronization           100  avgt   12     26.486 ±  2.229  ns/op
> LockUnlock.testSerialLockUnlock                   100  avgt   12    424.499 ±  0.416  ns/op
> LockUnlock.testSimpleLockUnlock                   100  avgt   12    424.241 ±  0.840  ns/op
> Finished running test 'micro:vm.lang.Lo...

Amit Kumar has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains seven commits:

 - Merge branch 'master' into recursive_locking_v1
 - not using load_const_optimized in compiler_fast_lock_lightweight_object
 - minor code formatting & variable renamings
 - revert DiagnoseSyncOnValueBasedClasses changes from c1
 - suggestions from Axel
 - Merge branch 'master' into recursive_locking_v1
 - s390x recursive locking port

-------------

Changes: https://git.openjdk.org/jdk/pull/18878/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18878&range=05
  Stats: 553 lines in 9 files changed: 426 ins; 64 del; 63 mod
  Patch: https://git.openjdk.org/jdk/pull/18878.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18878/head:pull/18878

PR: https://git.openjdk.org/jdk/pull/18878