Change the size of a mini-lookaside allocation to a macro (MINI_SZ) rather

than a magic number (128).

FossilOrigin-Name: 5e1949bca998f3c8c23a8ebf01c7a2e7a2af1fdad43886271e1fe0f25411551d

3 files changed, 10 insertions, 7 deletions

diff --git a/src/main.c b/src/main.c
index 96234bfe4..5b70273af 100644
--- a/src/main.c
+++ b/src/main.c
@@ -720,9 +720,9 @@ static int setupLookaside(sqlite3 *db, void *pBuf, int sz, int cnt){
   db->lookaside.pMiniFree = 0;
   /* The arithmetic below causes the number of large lookaside slots to be 1/3
   ** the number of mini slots, based on the observation that 75% of allocations
-  ** are <=128B.
+  ** are <= MINI_SZ bytes.
   */
-  cnt = szAlloc/(3*128+sz);
+  cnt = szAlloc/(3*MINI_SZ+sz);
 #endif
   db->lookaside.sz = (u16)sz;
   db->lookaside.szTrue = (u16)sz;
@@ -740,11 +740,11 @@ static int setupLookaside(sqlite3 *db, void *pBuf, int sz, int cnt){
 #ifndef SQLITE_OMIT_MINI_LOOKASIDE
     db->lookaside.pMiddle = p;
     /* Fill the remainder of the buffer with mini slots */
-    while(p<=(LookasideSlot*)&((u8*)pStart)[szAlloc-128]){
+    while(p<=(LookasideSlot*)&((u8*)pStart)[szAlloc-MINI_SZ]){
       p->pNext = db->lookaside.pMiniInit;
       db->lookaside.pMiniInit = p;
       db->lookaside.nSlot++;
-      p = (LookasideSlot*)&((u8*)p)[128];
+      p = (LookasideSlot*)&((u8*)p)[MINI_SZ];
     }
 #endif
     db->lookaside.pEnd = p;
diff --git a/src/malloc.c b/src/malloc.c
index 9241b97c7..8f77c9643 100644
--- a/src/malloc.c
+++ b/src/malloc.c
@@ -334,7 +334,7 @@ int sqlite3MallocSize(void *p){
 }
 static int lookasideMallocSize(sqlite3 *db, void *p){
 #ifndef SQLITE_OMIT_MINI_LOOKASIDE    
-  return p<db->lookaside.pMiddle ? db->lookaside.szTrue : 128;
+  return p<db->lookaside.pMiddle ? db->lookaside.szTrue : MINI_SZ;
 #else
   return db->lookaside.szTrue;
 #endif  
@@ -408,7 +408,7 @@ void sqlite3DbFreeNN(sqlite3 *db, void *p){
       if( p>=db->lookaside.pMiddle ){
 # ifdef SQLITE_DEBUG
         /* Trash all content in the buffer being freed */
-        memset(p, 0xaa, 128);
+        memset(p, 0xaa, MINI_SZ);
 # endif
         pBuf->pNext = db->lookaside.pMiniFree;
         db->lookaside.pMiniFree = pBuf;
@@ -583,7 +583,7 @@ void *sqlite3DbMallocRawNN(sqlite3 *db, u64 n){
     }
     db->lookaside.anStat[1]++;
 # ifndef SQLITE_OMIT_MINI_LOOKASIDE
-  }else if( n<=128 ){
+  }else if( n<=MINI_SZ ){
     if( (pBuf = db->lookaside.pMiniFree)!=0 ){
       db->lookaside.pMiniFree = pBuf->pNext;
       db->lookaside.anStat[0]++;
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 528092337..d01c8128b 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -1303,6 +1303,9 @@ struct LookasideSlot {
 #define EnableLookaside   db->lookaside.bDisable--;\
    db->lookaside.sz=db->lookaside.bDisable?0:db->lookaside.szTrue
 
+/* Size of the MINI lookside allocation */
+#define MINI_SZ           128
+
 /*
 ** A hash table for built-in function definitions.  (Application-defined
 ** functions use a regular table table from hash.h.)