Add a braindead 10x speedup to kmalloc().

Skip over entirely full buckets when scanning for a big-enough memory slot. This means I can postpone writing a better kmalloc() for a while longer! :^)
AmusedNetwork · Nov 12, 2018 · 5e8e554 · 5e8e554
1 parent dea474d
commit 5e8e554
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/Kernel/kmalloc.cpp b/Kernel/kmalloc.cpp
@@ -112,6 +112,12 @@ void* kmalloc(dword size)
 
  for( i = 0; i < (POOL_SIZE / CHUNK_SIZE / 8); ++i )
  {
+ if (alloc_map[i] == 0xff) {
+ // Skip over completely full bucket.
+ chunks_here = 0;
+ continue;
+ }
+ // FIXME: This scan can be optimized further with LZCNT.
  for( j = 0; j < 8; ++j )
  {
  if( !(alloc_map[i] & (1<<j)) )