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heap: update the calculation of fl index max and use bitfield in control_t

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The calculation of fl index max is changed to always be the smallest
number that includes the size of the registered memory.

The control_construct() function now checks for minimum size as the control structure
parameters are calculated.

There is no longer a minimum configuration for fl index max so the tlsf_config
enum is striped down to remove unecessary compile time values.

the tlsf_size() function will fail if no tlsf pointer is passed as parameter since there
is no way to calculate a default tlsf size anymore.

bitfields are now used in control_t when possible which reduces the size of the structure
from 56 bytes to 36 bytes.
This commit is contained in:
Guillaume Souchere
2022-10-13 10:02:29 +02:00
committed by BOT
parent 9f6b549dea
commit 48b0000e22
5 changed files with 97 additions and 64 deletions
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35
components/heap/heap_tlsf.h
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@@ -78,13 +78,25 @@ 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. */
@@ -128,6 +140,15 @@ size_t tlsf_block_size_min(void);
size_t tlsf_block_size_max(tlsf_t tlsf);
size_t tlsf_pool_overhead(void);
size_t tlsf_alloc_overhead(void);
/**
* @brief Return the allocable size based on the size passed
* as parameter
*
* @param tlsf Pointer to the tlsf structure
* @param size The allocation size
* @return size_t The updated allocation size
*/
size_t tlsf_fit_size(tlsf_t tlsf, size_t size);
/* Debugging. */