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Add a braindead 10x speedup to kmalloc().

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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! :^)
This commit is contained in:
Andreas Kling 2018-11-12 15:25:57 +01:00
parent dea474dfd5
commit 5e8e554f94
1 changed files with 6 additions and 0 deletions
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6
Kernel/kmalloc.cpp
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@ -112,6 +112,12 @@ void* kmalloc(dword size)
for( i = 0; i < (POOL_SIZE / CHUNK_SIZE / 8); ++i ) 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 ) for( j = 0; j < 8; ++j )
{ {
if( !(alloc_map[i] & (1<<j)) ) if( !(alloc_map[i] & (1<<j)) )