Merge

hotspot/src/os/linux/vm/os_linux.cpp

@@ -169,7 +169,35 @@ sigset_t SR_sigset;
 /* Used to protect dlsym() calls */
 static pthread_mutex_t dl_mutex;
 
-////////////////////////////////////////////////////////////////////////////////
+#ifdef JAVASE_EMBEDDED
+class MemNotifyThread: public Thread {
+  friend class VMStructs;
+ public:
+  virtual void run();
+
+ private:
+  static MemNotifyThread* _memnotify_thread;
+  int _fd;
+
+ public:
+
+  // Constructor
+  MemNotifyThread(int fd);
+
+  // Tester
+  bool is_memnotify_thread() const { return true; }
+
+  // Printing
+  char* name() const { return (char*)"Linux MemNotify Thread"; }
+
+  // Returns the single instance of the MemNotifyThread
+  static MemNotifyThread* memnotify_thread() { return _memnotify_thread; }
+
+  // Create and start the single instance of MemNotifyThread
+  static void start();
+};
+#endif // JAVASE_EMBEDDED
+
 // utility functions
 
 static int SR_initialize();
@@ -2085,6 +2113,14 @@ void os::print_os_info(outputStream* st) {
   st->cr();
 }
 
+void os::pd_print_cpu_info(outputStream* st) {
+  st->print("\n/proc/cpuinfo:\n");
+  if (!_print_ascii_file("/proc/cpuinfo", st)) {
+    st->print("  <Not Available>");
+  }
+  st->cr();
+}
+
 void os::print_memory_info(outputStream* st) {
 
   st->print("Memory:");
@@ -4237,7 +4273,16 @@ jint os::init_2(void)
 }
 
 // this is called at the end of vm_initialization
-void os::init_3(void) { }
+void os::init_3(void)
+{
+#ifdef JAVASE_EMBEDDED
+  // Start the MemNotifyThread
+  if (LowMemoryProtection) {
+    MemNotifyThread::start();
+  }
+  return;
+#endif
+}
 
 // Mark the polling page as unreadable
 void os::make_polling_page_unreadable(void) {
@@ -5360,3 +5405,78 @@ bool os::is_headless_jre() {
     return true;
 }
 
+
+#ifdef JAVASE_EMBEDDED
+//
+// A thread to watch the '/dev/mem_notify' device, which will tell us when the OS is running low on memory.
+//
+MemNotifyThread* MemNotifyThread::_memnotify_thread = NULL;
+
+// ctor
+//
+MemNotifyThread::MemNotifyThread(int fd): Thread() {
+  assert(memnotify_thread() == NULL, "we can only allocate one MemNotifyThread");
+  _fd = fd;
+
+  if (os::create_thread(this, os::os_thread)) {
+    _memnotify_thread = this;
+    os::set_priority(this, NearMaxPriority);
+    os::start_thread(this);
+  }
+}
+
+// Where all the work gets done
+//
+void MemNotifyThread::run() {
+  assert(this == memnotify_thread(), "expected the singleton MemNotifyThread");
+
+  // Set up the select arguments
+  fd_set rfds;
+  if (_fd != -1) {
+    FD_ZERO(&rfds);
+    FD_SET(_fd, &rfds);
+  }
+
+  // Now wait for the mem_notify device to wake up
+  while (1) {
+    // Wait for the mem_notify device to signal us..
+    int rc = select(_fd+1, _fd != -1 ? &rfds : NULL, NULL, NULL, NULL);
+    if (rc == -1) {
+      perror("select!\n");
+      break;
+    } else if (rc) {
+      //ssize_t free_before = os::available_memory();
+      //tty->print ("Notified: Free: %dK \n",os::available_memory()/1024);
+
+      // The kernel is telling us there is not much memory left...
+      // try to do something about that
+
+      // If we are not already in a GC, try one.
+      if (!Universe::heap()->is_gc_active()) {
+        Universe::heap()->collect(GCCause::_allocation_failure);
+
+        //ssize_t free_after = os::available_memory();
+        //tty->print ("Post-Notify: Free: %dK\n",free_after/1024);
+        //tty->print ("GC freed: %dK\n", (free_after - free_before)/1024);
+      }
+      // We might want to do something like the following if we find the GC's are not helping...
+      // Universe::heap()->size_policy()->set_gc_time_limit_exceeded(true);
+    }
+  }
+}
+
+//
+// See if the /dev/mem_notify device exists, and if so, start a thread to monitor it.
+//
+void MemNotifyThread::start() {
+  int    fd;
+  fd = open ("/dev/mem_notify", O_RDONLY, 0);
+  if (fd < 0) {
+      return;
+  }
+
+  if (memnotify_thread() == NULL) {
+    new MemNotifyThread(fd);
+  }
+}
+#endif // JAVASE_EMBEDDED

hotspot/src/os/solaris/vm/os_solaris.cpp

@@ -2317,6 +2317,10 @@ static bool check_addr0(outputStream* st) {
   return status;
 }
 
+void os::pd_print_cpu_info(outputStream* st) {
+  // Nothing to do for now.
+}
+
 void os::print_memory_info(outputStream* st) {
   st->print("Memory:");
   st->print(" %dk page", os::vm_page_size()>>10);

hotspot/src/os/windows/vm/os_windows.cpp

@@ -1720,6 +1720,10 @@ void os::print_os_info(outputStream* st) {
   st->cr();
 }
 
+void os::pd_print_cpu_info(outputStream* st) {
+  // Nothing to do for now.
+}
+
 void os::print_memory_info(outputStream* st) {
   st->print("Memory:");
   st->print(" %dk page", os::vm_page_size()>>10);

hotspot/src/os_cpu/linux_x86/vm/assembler_linux_x86.cpp

@@ -33,6 +33,28 @@ void MacroAssembler::int3() {
   call(RuntimeAddress(CAST_FROM_FN_PTR(address, os::breakpoint)));
 }
 
+#ifdef MINIMIZE_RAM_USAGE
+
+void MacroAssembler::get_thread(Register thread) {
+  // call pthread_getspecific
+  // void * pthread_getspecific(pthread_key_t key);
+  if (thread != rax) push(rax);
+  push(rcx);
+  push(rdx);
+
+  push(ThreadLocalStorage::thread_index());
+  call(RuntimeAddress(CAST_FROM_FN_PTR(address, pthread_getspecific)));
+  increment(rsp, wordSize);
+
+  pop(rdx);
+  pop(rcx);
+  if (thread != rax) {
+    mov(thread, rax);
+    pop(rax);
+  }
+}
+
+#else
 void MacroAssembler::get_thread(Register thread) {
   movl(thread, rsp);
   shrl(thread, PAGE_SHIFT);
@@ -43,6 +65,7 @@ void MacroAssembler::get_thread(Register thread) {
 
   movptr(thread, tls);
 }
+#endif // MINIMIZE_RAM_USAGE
 #else
 void MacroAssembler::int3() {
   call(RuntimeAddress(CAST_FROM_FN_PTR(address, os::breakpoint)));

hotspot/src/os_cpu/linux_x86/vm/threadLS_linux_x86.cpp

@@ -52,25 +52,20 @@
 // MADV_DONTNEED on Linux keeps the virtual memory mapping, but zaps the
 // physical memory page (i.e. similar to MADV_FREE on Solaris).
 
-#ifndef AMD64
+#if !defined(AMD64) && !defined(MINIMIZE_RAM_USAGE)
 Thread* ThreadLocalStorage::_sp_map[1UL << (SP_BITLENGTH - PAGE_SHIFT)];
-#endif // !AMD64
 
 void ThreadLocalStorage::generate_code_for_get_thread() {
     // nothing we can do here for user-level thread
 }
 
 void ThreadLocalStorage::pd_init() {
-#ifndef AMD64
   assert(align_size_down(os::vm_page_size(), PAGE_SIZE) == os::vm_page_size(),
          "page size must be multiple of PAGE_SIZE");
-#endif // !AMD64
 }
 
 void ThreadLocalStorage::pd_set_thread(Thread* thread) {
   os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread);
-
-#ifndef AMD64
   address stack_top = os::current_stack_base();
   size_t stack_size = os::current_stack_size();
 
@@ -88,5 +83,17 @@ void ThreadLocalStorage::pd_set_thread(Thread* thread) {
            "thread exited without detaching from VM??");
     _sp_map[(uintptr_t)p >> PAGE_SHIFT] = thread;
   }
-#endif // !AMD64
 }
+#else
+
+void ThreadLocalStorage::generate_code_for_get_thread() {
+    // nothing we can do here for user-level thread
+}
+
+void ThreadLocalStorage::pd_init() {
+}
+
+void ThreadLocalStorage::pd_set_thread(Thread* thread) {
+  os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread);
+}
+#endif // !AMD64 && !MINIMIZE_RAM_USAGE

hotspot/src/os_cpu/linux_x86/vm/threadLS_linux_x86.hpp

@@ -27,28 +27,32 @@
 
   // Processor dependent parts of ThreadLocalStorage
 
-#ifndef AMD64
+#if !defined(AMD64) && !defined(MINIMIZE_RAM_USAGE)
+
   // map stack pointer to thread pointer - see notes in threadLS_linux_x86.cpp
   #define SP_BITLENGTH  32
   #define PAGE_SHIFT    12
   #define PAGE_SIZE     (1UL << PAGE_SHIFT)
   static Thread* _sp_map[1UL << (SP_BITLENGTH - PAGE_SHIFT)];
-#endif // !AMD64
 
 public:
 
-#ifndef AMD64
   static Thread** sp_map_addr() { return _sp_map; }
-#endif // !AMD64
 
   static Thread* thread() {
-#ifdef AMD64
-    return (Thread*) os::thread_local_storage_at(thread_index());
-#else
     uintptr_t sp;
     __asm__ volatile ("movl %%esp, %0" : "=r" (sp));
     return _sp_map[sp >> PAGE_SHIFT];
-#endif // AMD64
   }
 
+#else
+
+public:
+
+   static Thread* thread() {
+     return (Thread*) os::thread_local_storage_at(thread_index());
+   }
+
+#endif // AMD64 || MINIMIZE_RAM_USAGE
+
 #endif // OS_CPU_LINUX_X86_VM_THREADLS_LINUX_X86_HPP

hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp

@@ -2716,6 +2716,10 @@ void CMSCollector::gc_epilogue(bool full) {
   bitMapLock()->unlock();
   releaseFreelistLocks();
 
+  if (!CleanChunkPoolAsync) {
+    Chunk::clean_chunk_pool();
+  }
+
   _between_prologue_and_epilogue = false;  // ready for next cycle
 }
 

hotspot/src/share/vm/memory/defNewGeneration.cpp

@@ -905,6 +905,10 @@ void DefNewGeneration::gc_epilogue(bool full) {
     to()->check_mangled_unused_area_complete();
   }
 
+  if (!CleanChunkPoolAsync) {
+    Chunk::clean_chunk_pool();
+  }
+
   // update the generation and space performance counters
   update_counters();
   gch->collector_policy()->counters()->update_counters();

hotspot/src/share/vm/memory/genCollectedHeap.cpp

@@ -1384,6 +1384,10 @@ void GenCollectedHeap::gc_epilogue(bool full) {
   generation_iterate(&blk, false);  // not old-to-young.
   perm_gen()->gc_epilogue(full);
 
+  if (!CleanChunkPoolAsync) {
+    Chunk::clean_chunk_pool();
+  }
+
   always_do_update_barrier = UseConcMarkSweepGC;
 };
 

hotspot/src/share/vm/opto/lcm.cpp

@@ -45,6 +45,9 @@
 #ifdef TARGET_ARCH_MODEL_arm
 # include "adfiles/ad_arm.hpp"
 #endif
+#ifdef TARGET_ARCH_MODEL_ppc
+# include "adfiles/ad_ppc.hpp"
+#endif
 
 // Optimization - Graph Style
 

hotspot/src/share/vm/opto/matcher.cpp

@@ -52,6 +52,9 @@
 #ifdef TARGET_ARCH_MODEL_arm
 # include "adfiles/ad_arm.hpp"
 #endif
+#ifdef TARGET_ARCH_MODEL_ppc
+# include "adfiles/ad_ppc.hpp"
+#endif
 
 OptoReg::Name OptoReg::c_frame_pointer;
 

hotspot/src/share/vm/prims/jni.cpp

@@ -70,15 +70,6 @@
 #include "utilities/dtrace.hpp"
 #include "utilities/events.hpp"
 #include "utilities/histogram.hpp"
-#ifdef TARGET_ARCH_x86
-# include "jniTypes_x86.hpp"
-#endif
-#ifdef TARGET_ARCH_sparc
-# include "jniTypes_sparc.hpp"
-#endif
-#ifdef TARGET_ARCH_zero
-# include "jniTypes_zero.hpp"
-#endif
 #ifdef TARGET_OS_FAMILY_linux
 # include "os_linux.inline.hpp"
 # include "thread_linux.inline.hpp"

hotspot/src/share/vm/runtime/arguments.cpp

@@ -37,15 +37,6 @@
 #include "services/management.hpp"
 #include "utilities/defaultStream.hpp"
 #include "utilities/taskqueue.hpp"
-#ifdef TARGET_ARCH_x86
-# include "vm_version_x86.hpp"
-#endif
-#ifdef TARGET_ARCH_sparc
-# include "vm_version_sparc.hpp"
-#endif
-#ifdef TARGET_ARCH_zero
-# include "vm_version_zero.hpp"
-#endif
 #ifdef TARGET_OS_FAMILY_linux
 # include "os_linux.inline.hpp"
 #endif
@@ -251,6 +242,11 @@ static ObsoleteFlag obsolete_jvm_flags[] = {
   { "UseParallelOldGCDensePrefix",
                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
   { "AllowTransitionalJSR292",       JDK_Version::jdk(7), JDK_Version::jdk(8) },
+  { "UseCompressedStrings",          JDK_Version::jdk(7), JDK_Version::jdk(8) },
+#ifdef PRODUCT
+  { "DesiredMethodLimit",
+                           JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
+#endif // PRODUCT
   { NULL, JDK_Version(0), JDK_Version(0) }
 };
 
@@ -2912,6 +2908,18 @@ void Arguments::set_shared_spaces_flags() {
   }
 }
 
+// Disable options not supported in this release, with a warning if they
+// were explicitly requested on the command-line
+#define UNSUPPORTED_OPTION(opt, description)                    \
+do {                                                            \
+  if (opt) {                                                    \
+    if (FLAG_IS_CMDLINE(opt)) {                                 \
+      warning(description " is disabled in this release.");     \
+    }                                                           \
+    FLAG_SET_DEFAULT(opt, false);                               \
+  }                                                             \
+} while(0)
+
 // Parse entry point called from JNI_CreateJavaVM
 
 jint Arguments::parse(const JavaVMInitArgs* args) {
@@ -3009,6 +3017,13 @@ jint Arguments::parse(const JavaVMInitArgs* args) {
     return result;
   }
 
+#ifdef JAVASE_EMBEDDED
+  #ifdef PPC
+    UNSUPPORTED_OPTION(EnableInvokeDynamic, "Invoke dynamic");
+  #endif
+  UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
+#endif
+
 #ifndef PRODUCT
   if (TraceBytecodesAt != 0) {
     TraceBytecodes = true;

hotspot/src/share/vm/runtime/atomic.cpp

@@ -51,6 +51,12 @@
 #ifdef TARGET_OS_ARCH_windows_x86
 # include "atomic_windows_x86.inline.hpp"
 #endif
+#ifdef TARGET_OS_ARCH_linux_arm
+# include "atomic_linux_arm.inline.hpp"
+#endif
+#ifdef TARGET_OS_ARCH_linux_ppc
+# include "atomic_linux_ppc.inline.hpp"
+#endif
 
 jbyte Atomic::cmpxchg(jbyte exchange_value, volatile jbyte* dest, jbyte compare_value) {
   assert(sizeof(jbyte) == 1, "assumption.");

hotspot/src/share/vm/runtime/globals.hpp

@@ -343,6 +343,12 @@ class CommandLineFlags {
 #define falseInTiered true
 #endif
 
+#ifdef JAVASE_EMBEDDED
+#define falseInEmbedded false
+#else
+#define falseInEmbedded true
+#endif
+
 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 // product flags are always settable / visible
 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
@@ -438,6 +444,9 @@ class CommandLineFlags {
   product(bool, UsePPCLWSYNC, true,                                         \
           "Use lwsync instruction if true, else use slower sync")           \
                                                                             \
+  develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
+          "Whether to clean the chunk pool asynchronously")                 \
+                                                                            \
   /* Temporary: See 6948537 */                                             \
   experimental(bool, UseMemSetInBOT, true,                                  \
           "(Unstable) uses memset in BOT updates in GC code")               \
@@ -3611,13 +3620,9 @@ class CommandLineFlags {
                                                                             \
   /* flags for performance data collection */                               \
                                                                             \
-  NOT_EMBEDDED(product(bool, UsePerfData, true,                             \
+  product(bool, UsePerfData, falseInEmbedded,                               \
           "Flag to disable jvmstat instrumentation for performance testing" \
-          "and problem isolation purposes."))                               \
-                                                                            \
-  EMBEDDED_ONLY(product(bool, UsePerfData, false,                           \
-          "Flag to disable jvmstat instrumentation for performance testing" \
-          "and problem isolation purposes."))                               \
+          "and problem isolation purposes.")                                \
                                                                             \
   product(bool, PerfDataSaveToFile, false,                                  \
           "Save PerfData memory to hsperfdata_<pid> file on exit")          \

hotspot/src/share/vm/runtime/os.cpp

@@ -761,6 +761,7 @@ void os::print_cpu_info(outputStream* st) {
   // st->print("(active %d)", os::active_processor_count());
   st->print(" %s", VM_Version::cpu_features());
   st->cr();
+  pd_print_cpu_info(st);
 }
 
 void os::print_date_and_time(outputStream *st) {

hotspot/src/share/vm/runtime/os.hpp

@@ -480,6 +480,7 @@ class os: AllStatic {
   // Output format may be different on different platforms.
   static void print_os_info(outputStream* st);
   static void print_cpu_info(outputStream* st);
+  static void pd_print_cpu_info(outputStream* st);
   static void print_memory_info(outputStream* st);
   static void print_dll_info(outputStream* st);
   static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len);

hotspot/src/share/vm/runtime/thread.cpp

@@ -3347,7 +3347,9 @@ jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) {
   // Notify JVMTI agents that VM initialization is complete - nop if no agents.
   JvmtiExport::post_vm_initialized();
 
-  Chunk::start_chunk_pool_cleaner_task();
+  if (CleanChunkPoolAsync) {
+    Chunk::start_chunk_pool_cleaner_task();
+  }
 
   // initialize compiler(s)
   CompileBroker::compilation_init();