8331560: Refactor Hotspot container detection code so that subsystem delegates to controllers

make/data/hotspot-symbols/symbols-linux

@@ -22,6 +22,7 @@
 #
 
 JVM_handle_linux_signal
+JVM_IsContainerized
 JVM_IsUseContainerSupport
 numa_error
 numa_warn

src/hotspot/os/linux/cgroupUtil_linux.cpp

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2024, Red Hat, Inc.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "cgroupUtil_linux.hpp"
+
+int CgroupUtil::processor_count(CgroupCpuController* cpu_ctrl, int host_cpus) {
+  assert(host_cpus > 0, "physical host cpus must be positive");
+  int limit_count = host_cpus;
+  int quota  = cpu_ctrl->cpu_quota();
+  int period = cpu_ctrl->cpu_period();
+  int quota_count = 0;
+  int result = 0;
+
+  if (quota > -1 && period > 0) {
+    quota_count = ceilf((float)quota / (float)period);
+    log_trace(os, container)("CPU Quota count based on quota/period: %d", quota_count);
+  }
+
+  // Use quotas
+  if (quota_count != 0) {
+    limit_count = quota_count;
+  }
+
+  result = MIN2(host_cpus, limit_count);
+  log_trace(os, container)("OSContainer::active_processor_count: %d", result);
+  return result;
+}

src/hotspot/os/linux/cgroupUtil_linux.hpp

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2024, Red Hat, Inc.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef CGROUP_UTIL_LINUX_HPP
+#define CGROUP_UTIL_LINUX_HPP
+
+#include "utilities/globalDefinitions.hpp"
+#include "cgroupSubsystem_linux.hpp"
+
+class CgroupUtil: AllStatic {
+
+  public:
+    static int processor_count(CgroupCpuController* cpu, int host_cpus);
+};
+
+#endif // CGROUP_UTIL_LINUX_HPP