SapMachine SAP#1981: Enable UseCompactObjectHeaders by default

MBaesken · RealCLanger · commit 6c25e7ad5b22 · 2025-06-11T16:19:17.000+02:00
(cherry picked from commit d0643c3)
diff --git a/src/hotspot/share/runtime/globals.hpp b/src/hotspot/share/runtime/globals.hpp
@@ -128,7 +128,8 @@ const size_t minimumSymbolTableSize = 1024;
           "(Deprecated) Use 32-bit class pointers in 64-bit VM. "           \
           "lp64_product means flag is always constant in 32 bit VM")        \
                                                                             \
-  product(bool, UseCompactObjectHeaders, false,                             \
+  /* SapMachine 2025-06-11: enable UseCompactObjectHeaders by default */    \
+  product(bool, UseCompactObjectHeaders, true,                              \
           "Use compact 64-bit object headers in 64-bit VM")                 \
                                                                             \
   product(int, ObjectAlignmentInBytes, 8,                                   \

Original file line number	Diff line number	Diff line change
`@@ -128,7 +128,8 @@ const size_t minimumSymbolTableSize = 1024;`
`128`	`128`	`"(Deprecated) Use 32-bit class pointers in 64-bit VM. " \`
`129`	`129`	`"lp64_product means flag is always constant in 32 bit VM") \`
`130`	`130`	`\`
`131`		`- product(bool, UseCompactObjectHeaders, false, \`
	`131`	`+ /* SapMachine 2025-06-11: enable UseCompactObjectHeaders by default */ \`
	`132`	`+ product(bool, UseCompactObjectHeaders, true, \`
`132`	`133`	`"Use compact 64-bit object headers in 64-bit VM") \`
`133`	`134`	`\`
`134`	`135`	`product(int, ObjectAlignmentInBytes, 8, \`