8339019: Obsolete the UseLinuxPosixThreadCPUClocks flag

David Holmes · David Holmes · commit 7d3a4049d5d6 · 2024-12-10T07:43:34.000Z
Reviewed-by: ccheung, kbarrett
diff --git a/src/hotspot/os/linux/globals_linux.hpp b/src/hotspot/os/linux/globals_linux.hpp
@@ -38,9 +38,6 @@
   product(bool, UseOprofile, false,                                     \
         "enable support for Oprofile profiler")                         \
                                                                         \
-  product(bool, UseLinuxPosixThreadCPUClocks, true,                     \
-          "(Deprecated) enable fast Linux Posix clocks where available") \
-                                                                        \
   product(bool, UseTransparentHugePages, false,                         \
           "Use MADV_HUGEPAGE for large pages")                          \
                                                                         \
diff --git a/src/hotspot/os/linux/os_linux.cpp b/src/hotspot/os/linux/os_linux.cpp
@@ -1484,9 +1484,6 @@ double os::elapsedVTime() {
 }
 
 void os::Linux::fast_thread_clock_init() {
-  if (!UseLinuxPosixThreadCPUClocks) {
-    return;
-  }
   clockid_t clockid;
   struct timespec tp;
   int (*pthread_getcpuclockid_func)(pthread_t, clockid_t *) =

Original file line number	Diff line number	Diff line change
`@@ -38,9 +38,6 @@`
`38`	`38`	`product(bool, UseOprofile, false, \`
`39`	`39`	`"enable support for Oprofile profiler") \`
`40`	`40`	`\`
`41`		`- product(bool, UseLinuxPosixThreadCPUClocks, true, \`
`42`		`- "(Deprecated) enable fast Linux Posix clocks where available") \`
`43`		`- \`
`44`	`41`	`product(bool, UseTransparentHugePages, false, \`
`45`	`42`	`"Use MADV_HUGEPAGE for large pages") \`
`46`	`43`	`\`
Original file line number	Diff line number	Diff line change
`@@ -1484,9 +1484,6 @@ double os::elapsedVTime() {`
`1484`	`1484`	`}`
`1485`	`1485`
`1486`	`1486`	`void os::Linux::fast_thread_clock_init() {`
`1487`		`- if (!UseLinuxPosixThreadCPUClocks) {`
`1488`		`- return;`
`1489`		`- }`
`1490`	`1487`	`clockid_t clockid;`
`1491`	`1488`	`struct timespec tp;`
`1492`	`1489`	`int (pthread_getcpuclockid_func)(pthread_t, clockid_t ) =`