Performance improvement in sqlite3DbMallocRaw().

FossilOrigin-Name: ff8eadbed5004ab03438f737492387dee6b9750a

diff --git a/manifest b/manifest
index c246f07bd440e5c171f593b93b2d75da511b8efb..7ce89fb2c7552f02a5dc791463e19f986052a251 100644 (file)
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Suppress\sthe\sdisplay\sof\sthe\sP4\soperand\sin\sEXPLAIN\soutput\swhen\san\sopcode\nhas\sbeen\sconverted\sinto\sa\sNo-op.
-D 2016-01-20T02:36:12.461
+C Performance\simprovement\sin\ssqlite3DbMallocRaw().
+D 2016-01-20T03:36:32.428
 F Makefile.in a476545d0c8626224d0bacac85c6e2967474af81
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc 01e855f958932d0d3ed62ec675fc63e2cef61fcb
@@ -311,7 +311,7 @@ F src/journal.c b4124532212b6952f42eb2c12fa3c25701d8ba8d
 F src/legacy.c ba1863ea58c4c840335a84ec276fc2b25e22bc4e
 F src/loadext.c 84996d7d70a605597d79c1f1d7b2012a5fd34f2b
 F src/main.c b686dabe9a7ece9121da87120d5c7bf402d77eb3
-F src/malloc.c 8f787669e79de26efc42272b5797bc00fff527c6
+F src/malloc.c b67c26c359c13836d370350b3f43d228dff5b360
 F src/mem0.c 6a55ebe57c46ca1a7d98da93aaa07f99f1059645
 F src/mem1.c 6919bcf12f221868ea066eec27e579fed95ce98b
 F src/mem2.c f1940d9e91948dd6a908fbb9ce3835c36b5d83c3
@@ -1419,7 +1419,7 @@ F tool/vdbe_profile.tcl 246d0da094856d72d2c12efec03250d71639d19f
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh 48bd54594752d5be3337f12c72f28d2080cb630b
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P da527ddae06460ab4b706cdb871de2188ebaf5ac
-R 9c350206cbc3ec71bedbf771eaad6af4
+P 9f8297f862a110ded686d091854fae20c6bc393c
+R 90386a9e726561832778abc9155cd93d
 U drh
-Z d3ee680a30750cc9b6d539ba48a1436a
+Z 2aa4bf87eb3a329408d2351dd05edc2d

diff --git a/manifest.uuid b/manifest.uuid
index 4615528f3e72ff368887b8cbae22339c7d2de815..50bb5b1795fd8903722cc206dfab51aff5b8ddbe 100644 (file)
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-9f8297f862a110ded686d091854fae20c6bc393c
\ No newline at end of file
+ff8eadbed5004ab03438f737492387dee6b9750a
\ No newline at end of file

diff --git a/src/malloc.c b/src/malloc.c
index 2c493b93201734658b18684d5c3dde7d892d00c2..c8a04128cf1ccb913f81ecec701fa922290109e1 100644 (file)
--- a/src/malloc.c
+++ b/src/malloc.c
@@ -583,8 +583,9 @@ void *sqlite3DbMallocZero(sqlite3 *db, u64 n){
 }
 
 /*
-** Allocate and zero memory.  If the allocation fails, make
-** the mallocFailed flag in the connection pointer.
+** Allocate memory, either lookaside (if possible) or heap.  
+** If the allocation fails, set the mallocFailed flag in
+** the connection pointer.
 **
 ** If db!=0 and db->mallocFailed is true (indicating a prior malloc
 ** failure on the same database connection) then always return 0.
@@ -600,8 +601,8 @@ void *sqlite3DbMallocZero(sqlite3 *db, u64 n){
 ** In other words, if a subsequent malloc (ex: "b") worked, it is assumed
 ** that all prior mallocs (ex: "a") worked too.
 */
+static SQLITE_NOINLINE void *dbMallocRawFinish(sqlite3 *db, u64 n);
 void *sqlite3DbMallocRaw(sqlite3 *db, u64 n){
-  void *p;
   assert( db==0 || sqlite3_mutex_held(db->mutex) );
   assert( db==0 || db->pnBytesFreed==0 );
 #ifndef SQLITE_OMIT_LOOKASIDE
@@ -631,7 +632,10 @@ void *sqlite3DbMallocRaw(sqlite3 *db, u64 n){
     return 0;
   }
 #endif
-  p = sqlite3Malloc(n);
+  return dbMallocRawFinish(db, n);
+}
+static SQLITE_NOINLINE void *dbMallocRawFinish(sqlite3 *db, u64 n){
+  void *p = sqlite3Malloc(n);
   if( !p && db ){
     db->mallocFailed = 1;
   }