ndb - bug#25686

  add support for doing mlockall before mallc instead of after
  (recommit in 5.0)


ndb/include/portlib/NdbMem.h:
  add support for doing mlockall before mallc instead of after
ndb/src/common/portlib/NdbMem.c:
  add support for doing mlockall before mallc instead of after
ndb/src/kernel/blocks/cmvmi/Cmvmi.cpp:
  add support for doing mlockall before mallc instead of after
ndb/src/kernel/vm/Configuration.cpp:
  add support for doing mlockall before mallc instead of after
ndb/src/kernel/vm/Configuration.hpp:
  add support for doing mlockall before mallc instead of after
ndb/src/mgmsrv/ConfigInfo.cpp:
  add support for doing mlockall before mallc instead of after

ndb/include/portlib/NdbMem.h

@@ -66,7 +66,7 @@ void NdbMem_Free(void* ptr);
  * NdbMem_MemLockAll
  *   Locks virtual memory in main memory
  */
-int NdbMem_MemLockAll(void);
+int NdbMem_MemLockAll(int);
 
 /**
  * NdbMem_MemUnlockAll

ndb/src/common/portlib/NdbMem.c

@@ -57,7 +57,15 @@ void NdbMem_Free(void* ptr)
 }
 
  
-int NdbMem_MemLockAll(){
+int NdbMem_MemLockAll(int i){
+  if (i == 1)
+  {
+#if defined(HAVE_MLOCKALL) && defined(MCL_CURRENT) && defined (MCL_FUTURE)
+    return mlockall(MCL_CURRENT | MCL_FUTURE);
+#else
+    return -1;
+#endif
+  }
 #if defined(HAVE_MLOCKALL) && defined(MCL_CURRENT)
   return mlockall(MCL_CURRENT);
 #else

ndb/src/kernel/blocks/cmvmi/Cmvmi.cpp

@@ -342,9 +342,9 @@ void Cmvmi::execSTTOR(Signal* signal)
   if (theStartPhase == 1){
     jam();
 
-    if(theConfig.lockPagesInMainMemory())
+    if(theConfig.lockPagesInMainMemory() == 1)
     {
-      int res = NdbMem_MemLockAll();
+      int res = NdbMem_MemLockAll(0);
       if(res != 0){
 	g_eventLogger.warning("Failed to memlock pages");
 	warningEvent("Failed to memlock pages");
@@ -788,6 +788,21 @@ Cmvmi::execSTART_ORD(Signal* signal) {
   
   if(globalData.theStartLevel == NodeState::SL_CMVMI){
     jam();
+
+    if(theConfig.lockPagesInMainMemory() == 2)
+    {
+      int res = NdbMem_MemLockAll(1);
+      if(res != 0)
+      {
+	g_eventLogger.warning("Failed to memlock pages");
+	warningEvent("Failed to memlock pages");
+      }
+      else
+      {
+	g_eventLogger.info("Locked future allocations");
+      }
+    }
+    
     globalData.theStartLevel  = NodeState::SL_STARTING;
     globalData.theRestartFlag = system_started;
     /**

ndb/src/kernel/vm/Configuration.cpp

@@ -477,7 +477,7 @@ Configuration::setupConfiguration(){
   DBUG_VOID_RETURN;
 }
 
-bool 
+Uint32
 Configuration::lockPagesInMainMemory() const {
   return _lockPagesInMainMemory;
 }

ndb/src/kernel/vm/Configuration.hpp

@@ -37,7 +37,7 @@ public:
   void setupConfiguration();
   void closeConfiguration(bool end_session= true);
   
-  bool lockPagesInMainMemory() const;
+  Uint32 lockPagesInMainMemory() const;
   
   int timeBetweenWatchDogCheck() const ;
   void timeBetweenWatchDogCheck(int value);

ndb/src/mgmsrv/ConfigInfo.cpp

@@ -564,10 +564,10 @@ const ConfigInfo::ParamInfo ConfigInfo::m_ParamInfo[] = {
     "If set to yes, then NDB Cluster data will not be swapped out to disk",
     ConfigInfo::CI_USED,
     true,
-    ConfigInfo::CI_BOOL,
-    "false",
-    "false",
-    "true" },
+    ConfigInfo::CI_INT,
+    "0",
+    "1",
+    "2" },
 
   {
     CFG_DB_WATCHDOG_INTERVAL,