JDK-8301661: Enhance os::pd_print_cpu_info on macOS and Windows

make/autoconf/libraries.m4

@@ -170,7 +170,7 @@ AC_DEFUN_ONCE([LIB_SETUP_LIBRARIES],
 
   if test "x$OPENJDK_TARGET_OS" = xwindows; then
     BASIC_JVM_LIBS="$BASIC_JVM_LIBS kernel32.lib user32.lib gdi32.lib winspool.lib \
-        comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib \
+        comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib powrprof.lib uuid.lib \
         wsock32.lib winmm.lib version.lib psapi.lib"
   fi
   LIB_SETUP_JVM_LIBS(BUILD)

src/hotspot/os/bsd/os_bsd.cpp

@@ -1299,8 +1299,34 @@ void os::print_os_info(outputStream* st) {
   VM_Version::print_platform_virtualization_info(st);
 }
 
+#ifdef __APPLE__
+static void print_sysctl_info_string(const char* sysctlkey, outputStream* st, char* buf, size_t size) {
+  if (sysctlbyname(sysctlkey, buf, &size, NULL, 0) >= 0) {
+    st->print_cr("%s:%s", sysctlkey, buf);
+  }
+}
+
+static void print_sysctl_info_uint64(const char* sysctlkey, outputStream* st) {
+  uint64_t val;
+  size_t size=sizeof(uint64_t);
+  if (sysctlbyname(sysctlkey, &val, &size, NULL, 0) >= 0) {
+    st->print_cr("%s:%llu", sysctlkey, val);
+  }
+}
+#endif
+
 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
-  // Nothing to do for now.
+#ifdef __APPLE__
+  print_sysctl_info_string("machdep.cpu.brand_string", st, buf, buflen);
+  print_sysctl_info_uint64("hw.cpufrequency", st);
+  print_sysctl_info_uint64("hw.cpufrequency_min", st);
+  print_sysctl_info_uint64("hw.cpufrequency_max", st);
+  print_sysctl_info_uint64("hw.cachelinesize", st);
+  print_sysctl_info_uint64("hw.l1icachesize", st);
+  print_sysctl_info_uint64("hw.l1dcachesize", st);
+  print_sysctl_info_uint64("hw.l2cachesize", st);
+  print_sysctl_info_uint64("hw.l3cachesize", st);
+#endif
 }
 
 void os::get_summary_cpu_info(char* buf, size_t buflen) {

src/hotspot/os/windows/os_windows.cpp

@@ -91,6 +91,7 @@
 #include <shlobj.h>
 
 #include <malloc.h>
+#include <powerbase.h>
 #include <signal.h>
 #include <direct.h>
 #include <errno.h>
@@ -1876,8 +1877,65 @@ void os::win32::print_windows_version(outputStream* st) {
   st->cr();
 }
 
+// Processor Power Information; missing from Windows headers
+typedef struct _PROCESSOR_POWER_INFORMATION {
+    ULONG Number;
+    ULONG MaxMhz;     // max specified clock frequency of the system processor
+    ULONG CurrentMhz; // max specified processor clock frequency mult. by current processor throttle
+    ULONG MhzLimit;   // max specified processor clock frequency mult. by current processor thermal throttle limit
+    ULONG MaxIdleState;
+    ULONG CurrentIdleState;
+} PROCESSOR_POWER_INFORMATION;
+
 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
-  // Nothing to do for now.
+  int proc_count = os::processor_count();
+  // handle potential early cases where processor count is not yet set
+  if (proc_count < 1) {
+    SYSTEM_INFO si;
+    GetSystemInfo(&si);
+    proc_count = si.dwNumberOfProcessors;
+  }
+
+  size_t sz_check = sizeof(PROCESSOR_POWER_INFORMATION) * (size_t)proc_count;
+  NTSTATUS status = ::CallNtPowerInformation(ProcessorInformation, NULL, 0, buf, (ULONG) buflen);
+  int max_mhz = -1, current_mhz = -1, mhz_limit = -1;
+  bool same_vals_for_all_cpus = true;
+
+  if (status == ERROR_SUCCESS) {
+    PROCESSOR_POWER_INFORMATION* pppi = (PROCESSOR_POWER_INFORMATION*) buf;
+    for (int i = 0; i < proc_count; i++) {
+      if (i == 0) {
+        max_mhz = (int) pppi->MaxMhz;
+        current_mhz = (int) pppi->CurrentMhz;
+        mhz_limit = (int) pppi->MhzLimit;
+      } else {
+        if (max_mhz != (int) pppi->MaxMhz ||
+            current_mhz != (int) pppi->CurrentMhz ||
+            mhz_limit != (int) pppi->MhzLimit) {
+          same_vals_for_all_cpus = false;
+          break;
+        }
+      }
+      // avoid iteration in case buf is too small to hold all proc infos
+      if (sz_check > buflen) break;
+      pppi++;
+    }
+
+    if (same_vals_for_all_cpus && max_mhz != -1) {
+      st->print_cr("Processor Information for all %d processors :", proc_count);
+      st->print_cr("  Max Mhz: %d, Current Mhz: %d, Mhz Limit: %d", max_mhz, current_mhz, mhz_limit);
+      return;
+    }
+    // differing values, iterate again
+    pppi = (PROCESSOR_POWER_INFORMATION*) buf;
+    for (int i = 0; i < proc_count; i++) {
+      st->print_cr("Processor Information for processor %d", (int) pppi->Number);
+      st->print_cr("  Max Mhz: %d, Current Mhz: %d, Mhz Limit: %d",
+                     (int) pppi->MaxMhz, (int) pppi->CurrentMhz, (int) pppi->MhzLimit);
+      if (sz_check > buflen) break;
+      pppi++;
+    }
+  }
 }
 
 void os::get_summary_cpu_info(char* buf, size_t buflen) {