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kernel: heap: Add allocation metadata to allocated_bytes

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The allocated_bytes were missing the allocation metadata. Because of that
the sum of free_bytes and allocated_bytes doesn't remain constant after
each allocation. This convention doesn't match glibc's behavior. This
commit changes the chunksz_to_bytes function to include the metadata in the
calculation. The analysis of the mallinfo2 function from glibc has been
done in #92392 Pull Request.

Signed-off-by: Krzysztof Sychla <ksychla@antmicro.com>
This commit is contained in:
Krzysztof Sychla 2025-06-27 14:49:41 +02:00 committed by Daniel DeGrasse
parent b478cd8f37
commit a51d3c0f74
2 changed files with 3 additions and 3 deletions
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2
lib/heap/heap.h
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@ -255,7 +255,7 @@ static inline chunksz_t min_chunk_size(struct z_heap *h)
static inline size_t chunksz_to_bytes(struct z_heap *h, chunksz_t chunksz_in)
{
return chunksz_in * CHUNK_UNIT - chunk_header_bytes(h);
return chunksz_in * CHUNK_UNIT;
}
static inline int bucket_idx(struct z_heap *h, chunksz_t sz)

4
samples/basic/sys_heap/sample.yaml
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@ -9,8 +9,8 @@ common:
type: multi_line
ordered: true
regex:
- ".*allocated 15.,.*"
- ".*allocated 10.,.*"
- ".*allocated 16.,.*"
- ".*allocated 1..,.*"
- ".*allocated 0, free ..., max allocated ..., heap size 256.*"
tests:
sample.basic.sys_heap: