enh: use lock in buf pool only for rsma vnode

source/dnode/vnode/src/inc/vnd.h

@@ -65,6 +65,7 @@ struct SVBufPool {
   SVnode*          pVnode;
   volatile int32_t nRef;
   TdThreadSpinlock lock;
+  bool             isLock;
   int64_t          size;
   uint8_t*         ptr;
   SVBufPoolNode*   pTail;

source/dnode/vnode/src/vnd/vnodeBufPool.c

@@ -27,10 +27,15 @@ static int vnodeBufPoolCreate(SVnode *pVnode, int64_t size, SVBufPool **ppPool)
     return -1;
   }
 
-  if (taosThreadSpinInit(&pPool->lock, 0) != 0) {
-    taosMemoryFree(pPool);
-    terrno = TAOS_SYSTEM_ERROR(errno);
-    return -1;
+  if (VND_IS_RSMA(pVnode)) {
+    if (taosThreadSpinInit(&pPool->lock, 0) != 0) {
+      taosMemoryFree(pPool);
+      terrno = TAOS_SYSTEM_ERROR(errno);
+      return -1;
+    }
+    pPool->isLock = true;
+  } else {
+    pPool->isLock = false;
   }
 
   pPool->next = NULL;
@@ -49,7 +54,9 @@ static int vnodeBufPoolCreate(SVnode *pVnode, int64_t size, SVBufPool **ppPool)
 
 static int vnodeBufPoolDestroy(SVBufPool *pPool) {
   vnodeBufPoolReset(pPool);
-  taosThreadSpinDestroy(&pPool->lock);
+  if (pPool->isLock) {
+    taosThreadSpinDestroy(&pPool->lock);
+  }
   taosMemoryFree(pPool);
   return 0;
 }
@@ -114,7 +121,10 @@ void *vnodeBufPoolMalloc(SVBufPool *pPool, int size) {
   void          *p = NULL;
   ASSERT(pPool != NULL);
 
-  taosThreadSpinLock(&pPool->lock);
+  if (pPool->isLock) {
+    taosThreadSpinLock(&pPool->lock);
+  }
+
   if (pPool->node.size >= pPool->ptr - pPool->node.data + size) {
     // allocate from the anchor node
     p = pPool->ptr;
@@ -125,7 +135,9 @@ void *vnodeBufPoolMalloc(SVBufPool *pPool, int size) {
     pNode = taosMemoryMalloc(sizeof(*pNode) + size);
     if (pNode == NULL) {
       terrno = TSDB_CODE_OUT_OF_MEMORY;
-      taosThreadSpinUnlock(&pPool->lock);
+      if (pPool->isLock) {
+        taosThreadSpinUnlock(&pPool->lock);
+      }
       return NULL;
     }
 
@@ -138,7 +150,9 @@ void *vnodeBufPoolMalloc(SVBufPool *pPool, int size) {
 
     pPool->size = pPool->size + sizeof(*pNode) + size;
   }
-  taosThreadSpinUnlock(&pPool->lock);
+  if (pPool->isLock) {
+    taosThreadSpinUnlock(&pPool->lock);
+  }
   return p;
 }