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Faster memory allocation from lookaside by not trying to keep track of the

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number of outstanding allocations, and rather computing that value only
when requested.

FossilOrigin-Name: a06263f1efd2d45eac88b8d59e8fe8e458670fa3808c795feaa7f247fc36cbe9
This commit is contained in:
drh
2017-08-29 20:21:12 +00:00
parent 83bebddbd9
commit 52fb8e1945
7 changed files with 67 additions and 33 deletions
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15
src/malloc.c
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@@ -354,7 +354,6 @@ void sqlite3DbFreeNN(sqlite3 *db, void *p){
#endif
pBuf->pNext = db->lookaside.pFree;
db->lookaside.pFree = pBuf;
db->lookaside.nOut--;
return;
}
}
@@ -515,16 +514,16 @@ void *sqlite3DbMallocRawNN(sqlite3 *db, u64 n){
assert( db->mallocFailed==0 );
if( n>db->lookaside.sz ){
db->lookaside.anStat[1]++;
}else if( (pBuf = db->lookaside.pFree)==0 ){
db->lookaside.anStat[2]++;
}else{
}else if( (pBuf = db->lookaside.pFree)!=0 ){
db->lookaside.pFree = pBuf->pNext;
db->lookaside.nOut++;
db->lookaside.anStat[0]++;
if( db->lookaside.nOut>db->lookaside.mxOut ){
db->lookaside.mxOut = db->lookaside.nOut;
}
return (void*)pBuf;
}else if( (pBuf = db->lookaside.pInit)!=0 ){
db->lookaside.pInit = pBuf->pNext;
db->lookaside.anStat[0]++;
return (void*)pBuf;
}else{
db->lookaside.anStat[2]++;
}
}else if( db->mallocFailed ){
return 0;