#include "xbt/mmalloc.h"
#include "xbt/ex.h"
#include <semaphore.h>
+#include <stdint.h>
#ifdef HAVE_LIMITS_H
# include <limits.h>
# endif
#endif
-#define MMALLOC_MAGIC "mmalloc" /* Mapped file magic number */
-#define MMALLOC_MAGIC_SIZE 8 /* Size of magic number buf */
-#define MMALLOC_VERSION 2 /* Current mmalloc version */
+#define MMALLOC_MAGIC "mmalloc" /* Mapped file magic number */
+#define MMALLOC_MAGIC_SIZE 8 /* Size of magic number buf */
+#define MMALLOC_VERSION 2 /* Current mmalloc version */
/* The allocator divides the heap into blocks of fixed size; large
requests receive one or more whole blocks, and small requests
FIXME: we are not targeting 16bits machines anymore; update values */
-#define INT_BIT (CHAR_BIT * sizeof(int))
-#define BLOCKLOG (INT_BIT > 16 ? 12 : 9)
-#define BLOCKSIZE ((unsigned int) 1 << BLOCKLOG)
-#define BLOCKIFY(SIZE) (((SIZE) + BLOCKSIZE - 1) / BLOCKSIZE)
+#define INT_BIT (CHAR_BIT * sizeof(int))
+#define BLOCKLOG (INT_BIT > 16 ? 12 : 9)
+#define BLOCKSIZE ((unsigned int) 1 << BLOCKLOG)
+#define BLOCKIFY(SIZE) (((SIZE) + BLOCKSIZE - 1) / BLOCKSIZE)
/* We keep fragment-specific meta-data for introspection purposes, and these
* information are kept in fixed lenght arrays. Here is the computation of
* need to enlist the free fragments.
*/
-#define SMALLEST_POSSIBLE_MALLOC (sizeof(struct list))
+//#define SMALLEST_POSSIBLE_MALLOC (sizeof(struct list))
+#define SMALLEST_POSSIBLE_MALLOC (16*sizeof(struct list))
#define MAX_FRAGMENT_PER_BLOCK (BLOCKSIZE / SMALLEST_POSSIBLE_MALLOC)
/* The difference between two pointers is a signed int. On machines where
sign of the result is machine dependent for negative values, so force
it to be treated as an unsigned int. */
-#define ADDR2UINT(addr) ((unsigned int) ((char*) (addr) - (char*) NULL))
-#define RESIDUAL(addr,bsize) ((unsigned int) (ADDR2UINT (addr) % (bsize)))
+#define ADDR2UINT(addr) ((uintptr_t) ((char*) (addr) - (char*) NULL))
+#define RESIDUAL(addr,bsize) ((uintptr_t) (ADDR2UINT (addr) % (bsize)))
/* Determine the amount of memory spanned by the initial heap table
(not an absolute limit). */
-#define HEAP (INT_BIT > 16 ? 4194304 : 65536)
+#define HEAP (INT_BIT > 16 ? 4194304 : 65536)
/* Number of contiguous free blocks allowed to build up at the end of
memory before they will be returned to the system.
FIXME: this is not used anymore: we never return memory to the system. */
-#define FINAL_FREE_BLOCKS 8
+#define FINAL_FREE_BLOCKS 8
/* Where to start searching the free list when looking for new memory.
The two possible values are 0 and heapindex. Starting at 0 seems
to reduce total memory usage, while starting at heapindex seems to
run faster. */
-#define MALLOC_SEARCH_START mdp -> heapindex
+#define MALLOC_SEARCH_START mdp -> heapindex
/* Address to block number and vice versa. */
/* Doubly linked lists of free fragments. */
struct list {
- struct list *next;
- struct list *prev;
+ struct list *next;
+ struct list *prev;
+};
+
+/* Statistics available to the user. */
+struct mstats
+{
+ size_t bytes_total; /* Total size of the heap. */
+ size_t chunks_used; /* Chunks allocated by the user. */
+ size_t bytes_used; /* Byte total of user-allocated chunks. */
+ size_t chunks_free; /* Chunks in the free list. */
+ size_t bytes_free; /* Byte total of chunks in the free list. */
};
/* Data structure giving per-block information.
* - make room to store the backtrace of where the blocks and fragment were malloced, too.
*/
typedef struct {
- int type; /* 0: busy large block
- >0: busy fragmented (fragments of size 2^type bytes)
- <0: free block */
- union {
- /* Heap information for a busy block. */
- struct {
- size_t nfree; /* Free fragments in a fragmented block. */
- size_t first; /* First free fragment of the block. */
- unsigned short frag_size[MAX_FRAGMENT_PER_BLOCK];
- //void *bt[XBT_BACKTRACE_SIZE][MAX_FRAGMENT_PER_BLOCK]; /* Where it was malloced (or realloced lastly) */
- } busy_frag;
- struct {
- size_t size; /* Size (in blocks) of a large cluster. */
- size_t busy_size; /* Actually used space, in bytes */
- void *bt[XBT_BACKTRACE_SIZE]; /* Where it was malloced (or realloced lastly) */
- int bt_size;
- } busy_block;
- /* Heap information for a free block (that may be the first of a free cluster). */
- struct {
- size_t size; /* Size (in blocks) of a free cluster. */
- size_t next; /* Index of next free cluster. */
- size_t prev; /* Index of previous free cluster. */
- } free_block;
- };
+ int type; /* 0: busy large block
+ >0: busy fragmented (fragments of size 2^type bytes)
+ <0: free block */
+ union {
+ /* Heap information for a busy block. */
+ struct {
+ size_t nfree; /* Free fragments in a fragmented block. */
+ size_t first; /* First free fragment of the block. */
+ unsigned short frag_size[MAX_FRAGMENT_PER_BLOCK];
+ void *bt[MAX_FRAGMENT_PER_BLOCK][XBT_BACKTRACE_SIZE]; /* Where it was malloced (or realloced lastly) */
+ } busy_frag;
+ struct {
+ size_t size; /* Size (in blocks) of a large cluster. */
+ size_t busy_size; /* Actually used space, in bytes */
+ void *bt[XBT_BACKTRACE_SIZE]; /* Where it was malloced (or realloced lastly) */
+ int bt_size;
+ } busy_block;
+ /* Heap information for a free block (that may be the first of a free cluster). */
+ struct {
+ size_t size; /* Size (in blocks) of a free cluster. */
+ size_t next; /* Index of next free cluster. */
+ size_t prev; /* Index of previous free cluster. */
+ } free_block;
+ };
} malloc_info;
/* Internal structure that defines the format of the malloc-descriptor.
struct mdesc {
- /* Semaphore locking the access to the heap */
- sem_t sem;
+ /* Semaphore locking the access to the heap */
+ sem_t sem;
- /* Number of processes that attached the heap */
- unsigned int refcount;
+ /* Number of processes that attached the heap */
+ unsigned int refcount;
- /* Chained lists of mdescs */
- struct mdesc *next_mdesc;
+ /* Chained lists of mdescs */
+ struct mdesc *next_mdesc;
- /* The "magic number" for an mmalloc file. */
- char magic[MMALLOC_MAGIC_SIZE];
+ /* The "magic number" for an mmalloc file. */
+ char magic[MMALLOC_MAGIC_SIZE];
- /* The size in bytes of this structure, used as a sanity check when reusing
+ /* The size in bytes of this structure, used as a sanity check when reusing
a previously created mapped file. */
- unsigned int headersize;
+ unsigned int headersize;
- /* The version number of the mmalloc package that created this file. */
- unsigned char version;
+ /* The version number of the mmalloc package that created this file. */
+ unsigned char version;
- /* Some flag bits to keep track of various internal things. */
- unsigned int flags;
+ /* Some flag bits to keep track of various internal things. */
+ unsigned int flags;
- /* Number of info entries. */
- size_t heapsize;
+ /* Number of info entries. */
+ size_t heapsize;
- /* Pointer to first block of the heap (base of the first block). */
- void *heapbase;
+ /* Pointer to first block of the heap (base of the first block). */
+ void *heapbase;
- /* Current search index for the heap table. */
- /* Search index in the info table. */
- size_t heapindex;
+ /* Current search index for the heap table. */
+ /* Search index in the info table. */
+ size_t heapindex;
- /* Limit of valid info table indices. */
- size_t heaplimit;
+ /* Limit of valid info table indices. */
+ size_t heaplimit;
- /* Block information table.
+ /* Block information table.
Allocated with malign/mfree (not mmalloc/mfree). */
- /* Table indexed by block number giving per-block information. */
- malloc_info *heapinfo;
+ /* Table indexed by block number giving per-block information. */
+ malloc_info *heapinfo;
- /* List of all blocks containing free fragments of this size. The array indice is the log2 of requested size */
- struct list fraghead[BLOCKLOG];
+ /* List of all blocks containing free fragments of this size. The array indice is the log2 of requested size */
+ struct list fraghead[BLOCKLOG];
- /* The base address of the memory region for this malloc heap. This
+ /* The base address of the memory region for this malloc heap. This
is the location where the bookkeeping data for mmap and for malloc
begins. */
- void *base;
+ void *base;
- /* The current location in the memory region for this malloc heap which
+ /* The current location in the memory region for this malloc heap which
represents the end of memory in use. */
- void *breakval;
+ void *breakval;
- /* The end of the current memory region for this malloc heap. This is
+ /* The end of the current memory region for this malloc heap. This is
the first location past the end of mapped memory. */
- void *top;
+ void *top;
- /* Open file descriptor for the file to which this malloc heap is mapped.
+ /* Open file descriptor for the file to which this malloc heap is mapped.
This will always be a valid file descriptor, since /dev/zero is used
by default if no open file is supplied by the client. Also note that
it may change each time the region is mapped and unmapped. */
- int fd;
+ int fd;
+
+ /* Instrumentation. */
+
+ struct mstats heapstats;
};
int mmalloc_compare_mdesc(struct mdesc *mdp1, struct mdesc *mdp2);
-void mmalloc_display_info(void *h);
+//void *get_end_addr_heap(void *s_heap);
/* Bits to look at in the malloc descriptor flags word */
-#define MMALLOC_DEVZERO (1 << 0) /* Have mapped to /dev/zero */
+#define MMALLOC_DEVZERO (1 << 0) /* Have mapped to /dev/zero */
#define MMALLOC_ANONYMOUS (1 << 1) /* Use anonymous mapping */
-#define MMALLOC_INITIALIZED (1 << 2) /* Initialized mmalloc */
+#define MMALLOC_INITIALIZED (1 << 2) /* Initialized mmalloc */
/* A default malloc descriptor for the single sbrk() managed region. */
