src/os/linux/vm/os_linux.cpp

rev 6352 : imported patch 8031126-threadusertime

@@ -5269,11 +5269,10 @@
 //
 //  -1 on error.
 //
 
 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
-  static bool proc_task_unchecked = true;
   pid_t  tid = thread->osthread()->thread_id();
   char *s;
   char stat[2048];
   int statlen;
   char proc_name[64];

@@ -5282,28 +5281,11 @@
   char cdummy;
   int idummy;
   long ldummy;
   FILE *fp;
 
-  snprintf(proc_name, 64, "/proc/%d/stat", tid);
-
-  // The /proc/<tid>/stat aggregates per-process usage on
-  // new Linux kernels 2.6+ where NPTL is supported.
-  // The /proc/self/task/<tid>/stat still has the per-thread usage.
-  // See bug 6328462.
-  // There possibly can be cases where there is no directory
-  // /proc/self/task, so we check its availability.
-  if (proc_task_unchecked && os::Linux::is_NPTL()) {
-    // This is executed only once
-    proc_task_unchecked = false;
-    fp = fopen("/proc/self/task", "r");
-    if (fp != NULL) {
       snprintf(proc_name, 64, "/proc/self/task/%d/stat", tid);
-      fclose(fp);
-    }
-  }
-
   fp = fopen(proc_name, "r");
   if ( fp == NULL ) return -1;
   statlen = fread(stat, 1, 2047, fp);
   stat[statlen] = '\0';
   fclose(fp);