ad59e923e9
This struct is taking up most of the heap's constant footprint overhead. We can easily get rid of the list_size member as it is mostly used to determine if the list is empty, and that can be determined through other means. Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/*
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* Copyright (c) 2020 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_INCLUDE_MEMPOOL_HEAP_H_
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/* Compatibility implementation of a k_mem_pool backend in terms of a
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* k_heap
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*/
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/* The "ID" of a k_heap-based mempool is just the tuple of the data
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* block pointer and the heap that allocated it
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*/
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struct k_mem_block_id {
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void *data;
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struct k_heap *heap;
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};
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/* Note the data pointer gets unioned with the same value stored in
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* the ID field to save space.
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*/
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struct k_mem_block {
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union {
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void *data;
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struct k_mem_block_id id;
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};
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};
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struct k_mem_pool {
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struct k_heap *heap;
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};
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/* Sizing is a heuristic, as k_mem_pool made promises about layout
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* that k_heap does not. We make space for the number of maximum
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* objects defined, and include extra so there's enough metadata space
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* available for the maximum number of minimum-sized objects to be
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* stored: 8 bytes for each desired chunk header, and a 15 word block
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* to reserve room for a "typical" set of bucket list heads and the heap
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* footer(this size was picked more to conform with existing test
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* expectations than any rigorous theory -- we have tests that rely on being
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* able to allocate the blocks promised and ones that make assumptions about
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* when memory will run out).
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*/
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#define Z_MEM_POOL_DEFINE(name, minsz, maxsz, nmax, align) \
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K_HEAP_DEFINE(poolheap_##name, \
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((maxsz) * (nmax)) \
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+ 8 * ((maxsz) * (nmax) / (minsz)) \
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+ 15 * sizeof(void *)); \
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struct k_mem_pool name = { \
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.heap = &poolheap_##name \
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}
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#endif /* ZEPHYR_INCLUDE_MEMPOOL_HEAP_H_ */
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