Improve cake allocator's memory utilisation (#43)

[lunaix-os.git] / lunaix-os / includes / lunaix / mm / cake.h

diff --git a/lunaix-os/includes/lunaix/mm/cake.h b/lunaix-os/includes/lunaix/mm/cake.h
index 18d67e0bf3659bae32488122ef6c930aa88d8fc8..d880531399d1d06d42cad3a59c6f463e3e14afc3 100644 (file)
--- a/lunaix-os/includes/lunaix/mm/cake.h
+++ b/lunaix-os/includes/lunaix/mm/cake.h
@@ -2,10 +2,12 @@
 #define __LUNAIX_CAKE_H
 
 #include <lunaix/ds/llist.h>
+#include <lunaix/spike.h>
 
 #define PILE_NAME_MAXLEN 20
 
-#define PILE_CACHELINE 1
+#define PILE_ALIGN_CACHE 0b0001
+#define PILE_FL_EXTERN   0b0010
 
 struct cake_pile;
 
@@ -23,22 +25,39 @@ struct cake_pile
     u32_t alloced_pieces;
     u32_t pieces_per_cake;
     u32_t pg_per_cake;
-    char pile_name[PILE_NAME_MAXLEN];
+    u32_t options;
+    char pile_name[PILE_NAME_MAXLEN+1];
 
     pile_cb ctor;
 };
 
-typedef unsigned int piece_index_t;
+typedef unsigned short piece_t;
 
-#define EO_FREE_PIECE ((u32_t)-1)
+#define EO_FREE_PIECE ((piece_t)-1)
+
+#define CAKE_FL_SIZE        128 
+#define CAKE_FL_MAXLEN      \
+    ((unsigned int)((CAKE_FL_SIZE - sizeof(ptr_t)) / sizeof(piece_t)))
+struct cake_fl
+{
+    piece_t indices[CAKE_FL_MAXLEN];
+    struct cake_fl* next;
+} align(CAKE_FL_SIZE);
 
 struct cake_s
 {
     struct llist_header cakes;
+    struct cake_pile* owner;
     void* first_piece;
     unsigned int used_pieces;
     unsigned int next_free;
-    piece_index_t free_list[0];
+    union {
+        struct cake_fl* fl;
+        struct {
+            void* rsvd;
+            piece_t free_list[0];
+        };
+    };
 };
 
 /**
@@ -82,9 +101,21 @@ cake_init();
 void
 cake_export();
 
+void
+cake_reclaim_freed();
+
 /********** some handy constructor ***********/
 
 void
 cake_ctor_zeroing(struct cake_pile* pile, void* piece);
 
+#define DEADCAKE_MARK 0xdeadcafeUL
+
+static inline void
+cake_ensure_valid(void* area) {
+    if (unlikely(*(unsigned int*)area == DEADCAKE_MARK)) {
+        fail("access to freed cake piece");
+    }
+}
+
 #endif /* __LUNAIX_VALLOC_H */