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tlsf: move control_t to tlsf.c

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- the control_t structure should not be available to the user so it
was moved to tlsf.c. In addition bitfields are now used in control_t
when possible which reduces the size of the structure from 56 bytes
to 36 bytes.

- fix an assert message to place it in the tlsf_assert

- add comment about the index count log2 field in control_t
This commit is contained in:
Guillaume Souchere
2022-10-20 12:09:26 +02:00
parent eaa11bbf5d
commit 1ca1da2407
2 changed files with 22 additions and 10 deletions
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3
tlsf.c
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@@ -629,7 +629,8 @@ static control_t* control_construct(control_t* control, size_t bytes)
/* SL_INDEX_COUNT must be <= number of bits in sl_bitmap's storage type. */
tlsf_assert(sizeof(unsigned int) * CHAR_BIT >= control->sl_index_count); //CHAR_BIT less than sl_index_count");
tlsf_assert(sizeof(unsigned int) * CHAR_BIT >= control->sl_index_count
&& "CHAR_BIT less than sl_index_count");
/* Ensure we've properly tuned our sizes. */
tlsf_assert(ALIGN_SIZE == control->small_block_size / control->sl_index_count); //ALIGN_SIZE does not match");

29
tlsf_common.h
View File

@@ -93,24 +93,35 @@ typedef struct control_t
/* Empty lists point at this block to indicate they are free. */
block_header_t block_null;
/* Local parameter for the pool */
unsigned int fl_index_count;
unsigned int fl_index_shift;
unsigned int fl_index_max;
unsigned int sl_index_count;
unsigned int sl_index_count_log2;
unsigned int small_block_size;
/* Local parameter for the pool. Given the maximum
* value of each field, all the following parameters
* can fit on 4 bytes when using bitfields
*/
unsigned int fl_index_count : 5; // 5 cumulated bits
unsigned int fl_index_shift : 3; // 8 cumulated bits
unsigned int fl_index_max : 6; // 14 cumulated bits
unsigned int sl_index_count : 6; // 20 cumulated bits
/* log2 of number of linear subdivisions of block sizes. Larger
** values require more memory in the control structure. Values of
** 4 or 5 are typical.
*/
unsigned int sl_index_count_log2 : 3; // 23 cumulated bits
unsigned int small_block_size : 8; // 31 cumulated bits
/* size of the metadata ( size of control block,
* sl_bitmap and blocks )
*/
size_t size;
/* Bitmaps for free lists. */
unsigned int fl_bitmap;
unsigned int *sl_bitmap;
unsigned int *sl_bitmap;
/* Head of free lists. */
block_header_t** blocks;
} control_t;
#if defined(__cplusplus)
};
#endif