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mem-pool: only search head block for available space 

Instead of searching all memory blocks for available space to fulfill
a memory request, only search the head block. If the head block does
not have space, assume that previous block would most likely not be
able to fulfill request either. This could potentially lead to more
memory fragmentation, but also avoids searching memory blocks that
probably will not be able to fulfill request.

This pattern will benefit consumers that are able to generate a good
estimate for how much memory will be needed, or if they are performing
fixed sized allocations, so that once a block is exhausted it will
never be able to fulfill a future request.

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 19:49:33 +00:00 committed by Junio C Hamano
parent a849735bfb
commit 8fb8e3f636
1 changed files with 4 additions and 4 deletions
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8
mem-pool.c
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@ -21,16 +21,16 @@ static struct mp_block *mem_pool_alloc_block(struct mem_pool *mem_pool, size_t b
void *mem_pool_alloc(struct mem_pool *mem_pool, size_t len)
{
struct mp_block *p;
struct mp_block *p = NULL;
void *r;
/* round up to a 'uintmax_t' alignment */
if (len & (sizeof(uintmax_t) - 1))
len += sizeof(uintmax_t) - (len & (sizeof(uintmax_t) - 1));
for (p = mem_pool->mp_block; p; p = p->next_block)
if (p->end - p->next_free >= len)
break;
if (mem_pool->mp_block &&
mem_pool->mp_block->end - mem_pool->mp_block->next_free >= len)
p = mem_pool->mp_block;
if (!p) {
if (len >= (mem_pool->block_alloc / 2)) {