8293114: JVM should trim the native heap

Reviewed-by: stuefe
Backport-of: 9e4fc568a6f1a93c84a84d6cc5220c6eb4e546a5

Author: shipilev

src/hotspot/os/aix/os_aix.inline.hpp

@@ -47,7 +47,7 @@ inline bool os::must_commit_stack_guard_pages() {
 inline void os::map_stack_shadow_pages(address sp) {
 }
 
-// stubbed-out trim-native support
+// Trim-native support, stubbed out for now, may be enabled later
 inline bool os::can_trim_native_heap() { return false; }
 inline bool os::trim_native_heap(os::size_change_t* rss_change) { return false; }
 

src/hotspot/os/bsd/os_bsd.inline.hpp

@@ -51,7 +51,7 @@ inline bool os::must_commit_stack_guard_pages() {
 inline void os::map_stack_shadow_pages(address sp) {
 }
 
-// stubbed-out trim-native support
+// Trim-native support, stubbed out for now, may be enabled later
 inline bool os::can_trim_native_heap() { return false; }
 inline bool os::trim_native_heap(os::size_change_t* rss_change) { return false; }
 

src/hotspot/os/windows/os_windows.inline.hpp

@@ -93,7 +93,7 @@ inline void os::PlatformMonitor::notify_all() {
   WakeAllConditionVariable(&_cond);
 }
 
-// stubbed-out trim-native support
+// Trim-native support, stubbed out for now, may be enabled later
 inline bool os::can_trim_native_heap() { return false; }
 inline bool os::trim_native_heap(os::size_change_t* rss_change) { return false; }
 

src/hotspot/share/classfile/stringTable.cpp

@@ -49,6 +49,7 @@
 #include "runtime/safepointVerifiers.hpp"
 #include "runtime/timerTrace.hpp"
 #include "runtime/interfaceSupport.inline.hpp"
+#include "runtime/trimNativeHeap.hpp"
 #include "services/diagnosticCommand.hpp"
 #include "utilities/concurrentHashTable.inline.hpp"
 #include "utilities/concurrentHashTableTasks.inline.hpp"
@@ -431,6 +432,7 @@ void StringTable::clean_dead_entries(JavaThread* jt) {
 
   StringTableDeleteCheck stdc;
   StringTableDoDelete stdd;
+  NativeHeapTrimmer::SuspendMark sm("stringtable");
   {
     TraceTime timer("Clean", TRACETIME_LOG(Debug, stringtable, perf));
     while(bdt.do_task(jt, stdc, stdd)) {

src/hotspot/share/classfile/symbolTable.cpp

@@ -37,6 +37,7 @@
 #include "runtime/atomic.hpp"
 #include "runtime/interfaceSupport.inline.hpp"
 #include "runtime/timerTrace.hpp"
+#include "runtime/trimNativeHeap.hpp"
 #include "services/diagnosticCommand.hpp"
 #include "utilities/concurrentHashTable.inline.hpp"
 #include "utilities/concurrentHashTableTasks.inline.hpp"
@@ -697,6 +698,7 @@ void SymbolTable::clean_dead_entries(JavaThread* jt) {
 
   SymbolTableDeleteCheck stdc;
   SymbolTableDoDelete stdd;
+  NativeHeapTrimmer::SuspendMark sm("symboltable");
   {
     TraceTime timer("Clean", TRACETIME_LOG(Debug, symboltable, perf));
     while (bdt.do_task(jt, stdc, stdd)) {

src/hotspot/share/logging/logTag.hpp

@@ -187,6 +187,7 @@
   LOG_TAG(timer) \
   LOG_TAG(tlab) \
   LOG_TAG(tracking) \
+  LOG_TAG(trimnative) /* trim native heap */ \
   LOG_TAG(unload) /* Trace unloading of classes */ \
   LOG_TAG(unshareable) \
   LOG_TAG(update) \

src/hotspot/share/memory/arena.cpp

@@ -30,6 +30,7 @@
 #include "runtime/task.hpp"
 #include "runtime/threadCritical.hpp"
 #include "services/memTracker.hpp"
+#include "runtime/trimNativeHeap.hpp"
 #include "utilities/ostream.hpp"
 
 //--------------------------------------------------------------------------------------
@@ -136,6 +137,7 @@ class ChunkPool: public CHeapObj<mtInternal> {
   }
 
   static void clean() {
+    NativeHeapTrimmer::SuspendMark sm("chunk pool cleaner");
     enum { BlocksToKeep = 5 };
      _tiny_pool->free_all_but(BlocksToKeep);
      _small_pool->free_all_but(BlocksToKeep);

src/hotspot/share/prims/whitebox.cpp

@@ -2364,6 +2364,14 @@ WB_ENTRY(void, WB_UnlockCritical(JNIEnv* env, jobject wb))
   GCLocker::unlock_critical(thread);
 WB_END
 
+WB_ENTRY(void, WB_PreTouchMemory(JNIEnv* env, jobject wb, jlong addr, jlong size))
+  void* const from = (void*)addr;
+  void* const to = (void*)(addr + size);
+  if (from > to) {
+    os::pretouch_memory(from, to, os::vm_page_size());
+  }
+WB_END
+
 #define CC (char*)
 
 static JNINativeMethod methods[] = {
@@ -2631,6 +2639,7 @@ static JNINativeMethod methods[] = {
 
   {CC"lockCritical",    CC"()V",                      (void*)&WB_LockCritical},
   {CC"unlockCritical",  CC"()V",                      (void*)&WB_UnlockCritical},
+  {CC"preTouchMemory",  CC"(JJ)V",                    (void*)&WB_PreTouchMemory},
 };
 
 

src/hotspot/share/runtime/globals.hpp

@@ -2093,6 +2093,13 @@ const intx ObjectAlignmentInBytes = 8;
                                                                             \
   develop(bool, TraceOptimizedUpcallStubs, false,                              \
                 "Trace optimized upcall stub generation")                      \
+                                                                            \
+  product(uint, TrimNativeHeapInterval, 0, EXPERIMENTAL,                    \
+          "Interval, in ms, at which the JVM will trim the native heap if " \
+          "the platform supports that. Lower values will reclaim memory "   \
+          "more eagerly at the cost of higher overhead. A value of 0 "      \
+          "(default) disables native heap trimming.")                       \
+          range(0, UINT_MAX)                                                \
 
 // end of RUNTIME_FLAGS
 

src/hotspot/share/runtime/java.cpp

@@ -71,6 +71,7 @@
 #include "runtime/task.hpp"
 #include "runtime/thread.inline.hpp"
 #include "runtime/timer.hpp"
+#include "runtime/trimNativeHeap.hpp"
 #include "runtime/vmOperations.hpp"
 #include "runtime/vmThread.hpp"
 #include "runtime/vm_version.hpp"
@@ -467,6 +468,8 @@ void before_exit(JavaThread* thread, bool halt) {
     StringDedup::stop();
   }
 
+  NativeHeapTrimmer::cleanup();
+
   // Stop concurrent GC threads
   Universe::heap()->stop();