From c0d89b4eebfb427b80e358ff288efdd9da7bdc68 Mon Sep 17 00:00:00 2001
From: Lei Zaakjyu <lizbing07734@icloud.com>
Date: Fri, 15 Dec 2023 23:34:00 +0800
Subject: [PATCH] remove 'supports_vtime'

---
 src/hotspot/os/posix/os_posix.cpp                    | 2 --
 src/hotspot/os/windows/os_windows.cpp                | 2 --
 src/hotspot/share/gc/g1/g1ConcurrentRefineThread.hpp | 6 +-----
 src/hotspot/share/runtime/os.hpp                     | 1 -
 4 files changed, 1 insertion(+), 10 deletions(-)

diff --git a/src/hotspot/os/posix/os_posix.cpp b/src/hotspot/os/posix/os_posix.cpp
index 960fb465590cc..22f9f2a0e2d6e 100644
--- a/src/hotspot/os/posix/os_posix.cpp
+++ b/src/hotspot/os/posix/os_posix.cpp
@@ -1434,8 +1434,6 @@ jlong os::elapsed_frequency() {
   return NANOSECS_PER_SEC; // nanosecond resolution
 }
 
-bool os::supports_vtime() { return true; }
-
 // Return the real, user, and system times in seconds from an
 // arbitrary fixed point in the past.
 bool os::getTimesSecs(double* process_real_time,
diff --git a/src/hotspot/os/windows/os_windows.cpp b/src/hotspot/os/windows/os_windows.cpp
index 223bc0bd13514..3fb73422a7ee9 100644
--- a/src/hotspot/os/windows/os_windows.cpp
+++ b/src/hotspot/os/windows/os_windows.cpp
@@ -1049,8 +1049,6 @@ FILETIME java_to_windows_time(jlong l) {
   return result;
 }
 
-bool os::supports_vtime() { return true; }
-
 double os::elapsedVTime() {
   FILETIME created;
   FILETIME exited;
diff --git a/src/hotspot/share/gc/g1/g1ConcurrentRefineThread.hpp b/src/hotspot/share/gc/g1/g1ConcurrentRefineThread.hpp
index 0711b61b194fb..664944b8aaace 100644
--- a/src/hotspot/share/gc/g1/g1ConcurrentRefineThread.hpp
+++ b/src/hotspot/share/gc/g1/g1ConcurrentRefineThread.hpp
@@ -74,11 +74,7 @@ class G1ConcurrentRefineThread: public ConcurrentGCThread {
   // Update concurrent refine threads stats.
   // If we are in Primary thread, we additionally update CPU time tracking.
   virtual void track_usage() {
-    if (os::supports_vtime()) {
-      _vtime_accum = (os::elapsedVTime() - _vtime_start);
-    } else {
-      _vtime_accum = 0.0;
-    }
+    _vtime_accum = (os::elapsedVTime() - _vtime_start);
   };
 
   // Helper for do_refinement_step implementations.  Try to perform some
diff --git a/src/hotspot/share/runtime/os.hpp b/src/hotspot/share/runtime/os.hpp
index 094fd2509a05b..780aaadda29ef 100644
--- a/src/hotspot/share/runtime/os.hpp
+++ b/src/hotspot/share/runtime/os.hpp
@@ -281,7 +281,6 @@ class os: AllStatic {
   // actually run.  The first function indicates whether the OS supports
   // this functionality for the current thread, and if so the second
   // returns the elapsed virtual time for the current thread.
-  static bool supports_vtime();
   static double elapsedVTime();
 
   // Return current local time in a string (YYYY-MM-DD HH:MM:SS).