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decommit returns whether re-commit is needed

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daanx 2023-04-04 12:57:18 -07:00
parent 449aad0635
commit 5c39fe7246
6 changed files with 94 additions and 98 deletions
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11
include/mimalloc/prim.h
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@ -37,12 +37,21 @@ int _mi_prim_free(void* addr, size_t size );
// Allocate OS memory. Return NULL on error.
// The `try_alignment` is just a hint and the returned pointer does not have to be aligned.
// If `commit` is false, the virtual memory range only needs to be reserved (with no access)
// which will later be committed explicitly using `_mi_prim_commit`.
// pre: !commit => !allow_large
// try_alignment >= _mi_os_page_size() and a power of 2
int _mi_prim_alloc(size_t size, size_t try_alignment, bool commit, bool allow_large, bool* is_large, void** addr);
// Commit memory. Returns error code or 0 on success.
int _mi_prim_commit(void* addr, size_t size, bool commit);
// For example, on Linux this would make the memory PROT_READ|PROT_WRITE.
int _mi_prim_commit(void* addr, size_t size);
// Decommit memory. Returns error code or 0 on success. The `decommitted` result is true
// if the memory would need to be re-committed. For example, on Windows this is always true,
// but on Linux we could use MADV_DONTNEED to decommit which does not need a recommit.
// pre: decommitted != NULL
int _mi_prim_decommit(void* addr, size_t size, bool* decommitted);
// Reset memory. The range keeps being accessible but the content might be reset.
// Returns error code or 0 on success.