add minimal commit size for increased efficiency (decommit fine grained, commit coarse grained)

1 files changed, 7 insertions, 2 deletions

diff --git a/include/mimalloc-types.h b/include/mimalloc-types.h
index 8cd3a4c..6354979 100644
--- a/include/mimalloc-types.h
+++ b/include/mimalloc-types.h
@@ -320,10 +320,15 @@ typedef enum mi_segment_kind_e {
 // the corresponding MI_COMMIT_SIZE area is committed.
 // The MI_COMMIT_SIZE must be a multiple of the slice
 // size. If it is equal we have the most fine grained 
-// decommit but setting it higher can be more efficient.
+// decommit (but setting it higher can be more efficient).
+// The MI_MINIMAL_COMMIT_SIZE is the minimal amount that will
+// be committed in one go which can be set higher than
+// MI_COMMIT_SIZE for efficiency (while the decommit mask
+// is still tracked in fine-grained MI_COMMIT_SIZE chunks)
 // ------------------------------------------------------
 
-#define MI_COMMIT_SIZE              (8*MI_SEGMENT_SLICE_SIZE)   
+#define MI_MINIMAL_COMMIT_SIZE      (16*MI_SEGMENT_SLICE_SIZE)           // 1MiB
+#define MI_COMMIT_SIZE              (MI_SEGMENT_SLICE_SIZE)
 #define MI_COMMIT_MASK_BITS         (MI_SEGMENT_SIZE / MI_COMMIT_SIZE)  
 #define MI_COMMIT_MASK_FIELD_BITS    MI_SIZE_BITS
 #define MI_COMMIT_MASK_FIELD_COUNT  (MI_COMMIT_MASK_BITS / MI_COMMIT_MASK_FIELD_BITS)