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mem-pool: add life cycle management functions

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Add initialization and discard functions to mem_pool type. As the
memory allocated by mem_pool can now be freed, we also track the large
allocations.

If the there are existing mp_blocks in the mem_poo's linked list of
mp_blocksl, then the mp_block for a large allocation is inserted
behind the head block. This is because only the head mp_block is considered
when searching for availble space. This results in the following
desirable properties:

1) The mp_block allocated for the large request will not be included
not included in the search for available in future requests, the large
mp_block is sized for the specific request and does not contain any
spare space.

2) The head mp_block will not bumped from considation for future
memory requests just because a request for a large chunk of memory
came in.

These changes are in preparation for a future commit that will utilize
creating and discarding memory pool.

Signed-off-by: Jameson Miller <jamill@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jameson Miller
2018-07-02 19:49:34 +00:00
committed by Junio C Hamano
parent 8fb8e3f636
commit 158dfeff3d
2 changed files with 61 additions and 8 deletions
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10
mem-pool.h
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@@ -21,6 +21,16 @@ struct mem_pool {
size_t pool_alloc;
};
/*
* Initialize mem_pool with specified initial size.
*/
void mem_pool_init(struct mem_pool **mem_pool, size_t initial_size);
/*
* Discard a memory pool and free all the memory it is responsible for.
*/
void mem_pool_discard(struct mem_pool *mem_pool);
/*
* Alloc memory from the mem_pool.
*/