The sys_bitarray interface, gets memory blocks one by one from Internally, the memory blocks allocator uses a bitmap to keep track of The memory blocks allocator keeps track of unallocated blocks using Internal Operation ¶Įach buffer associated with an allocator is an array of fixed-size blocks, The buffer are similarly aligned to this boundary, the block size mustĭue to the use of internal bookkeeping structures and their creation,Įach memory blocks allocator must be declared and defined at compile time. The buffer must be aligned to an N-byte boundary, where N is a power of 2 It must be at least “block size” times “number of blocks” bytes long.Ī blocks bitmap to keep track of which block has been allocated. The number of blocks available for allocation.Ī buffer that provides the memory for the memory slab’s blocks. It must be at least 4N bytes long, where N is greater than 0. The block size of each block, measured in bytes. Each allocator is referenced by its memory address.Ī memory blocks allocator has the following key properties: Using Multi Memory Blocks Allocator GroupĪny number of Memory Blocks Allocator can be defined (limited only byĪvailable RAM). Memory regions where these can be powered down to conserve energy. This is useful for operations such as scatter-gather DMA transfers.īookkeeping of allocated blocks is done outside of the associatedīuffer (unlike memory slab). Multiple blocks can be allocated or freed at the same time.Ī group of blocks allocated together may not be contiguous. The Memory Blocks Allocator allows memory blocks to be dynamicallyĪllocated from a designated memory region, where:Īll memory blocks have a single fixed size.
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