infernap12/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2026-01-28 12:09:14 +00:00
Code Issues Packages Projects Releases Wiki Activity

8319251: [REDO] Change LockingMode default from LM_LEGACY to LM_LIGHTWEIGHT

Browse Source 
Reviewed-by: rkennke, dholmes
This commit is contained in:
Daniel D. Daugherty 2024-03-20 19:59:13 +00:00
parent fbeac98c84
commit 000f4d8d15
2 changed files with 35 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
src/hotspot/share/runtime/globals.hpp
View File

@ -1969,11 +1969,11 @@ const int ObjectAlignmentInBytes = 8;
"Mark all threads after a safepoint, and clear on a modify " \
"fence. Add cleanliness checks.") \
\
product(int, LockingMode, LM_LEGACY, \
product(int, LockingMode, LM_LIGHTWEIGHT, \
"Select locking mode: " \
"0: monitors only (LM_MONITOR), " \
"1: monitors & legacy stack-locking (LM_LEGACY, default), " \
"2: monitors & new lightweight locking (LM_LIGHTWEIGHT)") \
"1: monitors & legacy stack-locking (LM_LEGACY), " \
"2: monitors & new lightweight locking (LM_LIGHTWEIGHT, default)") \
range(0, 2) \
\
product(uint, TrimNativeHeapInterval, 0, \

34
test/jtreg-ext/requires/VMProps.java
View File

@ -419,13 +419,15 @@ public class VMProps implements Callable<Map<String, String>> {
}
/**
* @return true if compiler in use supports RTM and false otherwise.
* @return "true" if compiler in use supports RTM and "false" otherwise.
* Note: Lightweight locking does not support RTM (for now).
*/
protected String vmRTMCompiler() {
boolean isRTMCompiler = false;
if (Compiler.isC2Enabled() &&
(Platform.isX86() || Platform.isX64() || Platform.isPPC())) {
(Platform.isX86() || Platform.isX64() || Platform.isPPC()) &&
is_LM_LIGHTWEIGHT().equals("false")) {
isRTMCompiler = true;
}
return "" + isRTMCompiler;
@ -481,6 +483,34 @@ public class VMProps implements Callable<Map<String, String>> {
return "" + WB.getVMPageSize();
}
/**
* @return LockingMode.
*/
protected String vmLockingMode() {
return "" + WB.getIntVMFlag("LockingMode");
}
/**
* @return "true" if LockingMode == 0 (LM_MONITOR)
*/
protected String is_LM_MONITOR() {
return "" + vmLockingMode().equals("0");
}
/**
* @return "true" if LockingMode == 1 (LM_LEGACY)
*/
protected String is_LM_LEGACY() {
return "" + vmLockingMode().equals("1");
}
/**
* @return "true" if LockingMode == 2 (LM_LIGHTWEIGHT)
*/
protected String is_LM_LIGHTWEIGHT() {
return "" + vmLockingMode().equals("2");
}
/**
* Check if Graal is used as JIT compiler.
*