Integrated: 8308479: [s390x] Implement alternative fast-locking scheme

[Amit Kumar]

On Mon, 12 Jun 2023 11:04:53 GMT, Amit Kumar <amitkumar at openjdk.org> wrote:

> This PR implements new fast-locking scheme for s390x. Additionally few parameters have been renamed to be in sync with PPC.
> 
> Testing done (for release, fastdebug and slowdebug build):
> All `test/jdk/java/util/concurrent` test with parameters:
> * LockingMode=2 
> * LockingMode=2 with -Xint
> * LockingMode=2 with -XX:TieredStopAtLevel=1
> * LockingMode=2 with -XX:-TieredCompilation
> 
> Result is consistently similar to Aarch(MacOS) and PPC, All of 124 tests are passing except `MapLoops.java` because in the 2nd part for this testcase, jvm starts with `HeavyMonitors` which conflict with `LockingMode=2`
> 
> BenchMark Result for Renaissance-jmh:
> 
> | Benchmark                                | Without fastLock (ms/op) | With fastLock (ms/op) | Improvement |
> |------------------------------------------|-------------------------|----------------------|-------------|
> | o.r.actors.JmhAkkaUct.runOperation        | 1565.080                | 1365.877             | 12.70%      |
> | o.r.actors.JmhReactors.runOperation       | 9316.972                | 10592.982            | -13.70%     |
> | o.r.jdk.concurrent.JmhFjKmeans.runOperation | 1257.183                | 1235.530             | 1.73%       |
> | o.r.jdk.concurrent.JmhFutureGenetic.runOperation | 1925.158                | 2073.066             | -7.69%      |
> | o.r.jdk.streams.JmhParMnemonics.runOperation | 2746.664                | 2836.085             | -3.24%      |
> | o.r.jdk.streams.JmhScrabble.runOperation   | 76.774                  | 74.239               | 3.31%       |
> | o.r.rx.JmhRxScrabble.runOperation          | 162.270                 | 167.061              | -2.96%      |
> | o.r.scala.sat.JmhScalaDoku.runOperation    | 3333.711                | 3271.078             | 1.88%       |
> | o.r.scala.stdlib.JmhScalaKmeans.runOperation | 182.746                 | 182.153              | 0.33%       |
> | o.r.scala.stm.JmhPhilosophers.runOperation | 15003.329               | 13396.921            | 10.57%      |
> | o.r.scala.stm.JmhScalaStmBench7.runOperation | 1669.090                | 1579.900             | 5.34%       |
> | o.r.twitter.finagle.JmhFinagleChirper.runOperation | 9601.963                | 10034.404            | -4.52%      |
> | o.r.twitter.finagle.JmhFinagleHttp.runOperation | 4403.725                | 4746.707             | -7.79%      |
> 
> 
> DaCapo Benchmark Result:
> 
> | Benchmark                | Without fast lock (msec) | With fast lock (msec) | Improvement |
> |--------------------------|-------------------------|-----------------...

This pull request has now been integrated.

Changeset: 3fe6e0fa
Author:    Amit Kumar <amitkumar at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/3fe6e0faca78e8106e33a3a53de78f8864be92b7
Stats:     340 lines in 7 files changed: 206 ins; 21 del; 113 mod

8308479: [s390x] Implement alternative fast-locking scheme

Reviewed-by: lucy, mdoerr

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

PR: https://git.openjdk.org/jdk/pull/14414