RFR: 8303210: [linux, Windows] Enable UseSystemMemoryBarrier by default if possible [v3]

[Fei Yang]

On Tue, 28 Feb 2023 05:26:22 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> I'd like to enable UseSystemMemoryBarrier by default on supported Operating Systems in order to improve performance of thread state transitions (I/O, JNI, foreign function calls, JIT compiler threads, etc.). See JBS issue for more details.
>> Unfortunately, the feature was not yet implemented on all platforms. I added the code, but need the platform maintainers to check if it can be used reliably (and ideally if the performance improves). It's easy to switch it off again in case of problems.
>
> Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Improve logging.

bootcycle and tier1-3 test good on linux-riscv64 platform. I think it will be safer to explicitly include "runtime/globals.hpp":


diff --git a/src/hotspot/cpu/riscv/sharedRuntime_riscv.cpp b/src/hotspot/cpu/riscv/sharedRuntime_riscv.cpp
index d0083f932df..117145ac137 100644
--- a/src/hotspot/cpu/riscv/sharedRuntime_riscv.cpp
+++ b/src/hotspot/cpu/riscv/sharedRuntime_riscv.cpp
@@ -44,6 +44,7 @@
 #include "prims/methodHandles.hpp"
 #include "runtime/continuation.hpp"
 #include "runtime/continuationEntry.inline.hpp"
+#include "runtime/globals.hpp"
 #include "runtime/jniHandles.hpp"
 #include "runtime/safepointMechanism.hpp"
 #include "runtime/sharedRuntime.hpp"
diff --git a/src/hotspot/cpu/riscv/templateInterpreterGenerator_riscv.cpp b/src/hotspot/cpu/riscv/templateInterpreterGenerator_riscv.cpp
index 3a259d4ba18..ff7b40c2695 100644
--- a/src/hotspot/cpu/riscv/templateInterpreterGenerator_riscv.cpp
+++ b/src/hotspot/cpu/riscv/templateInterpreterGenerator_riscv.cpp
@@ -45,6 +45,7 @@
 #include "runtime/arguments.hpp"
 #include "runtime/deoptimization.hpp"
 #include "runtime/frame.inline.hpp"
+#include "runtime/globals.hpp"
 #include "runtime/jniHandles.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "runtime/stubRoutines.hpp"

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PR: https://git.openjdk.org/jdk/pull/12753