ganeshmurthy commented on a change in pull request #525: DISPATCH-1372
alloc_pool intrusive linked list can be replaced by a linked stack
URL: https://github.com/apache/qpid-dispatch/pull/525#discussion_r298301407
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File path: src/alloc_pool.c
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@@ -44,20 +46,142 @@ DEQ_DECLARE(qd_alloc_type_t, qd_alloc_type_list_t);
#define PATTERN_BACK 0xbabecafe
struct qd_alloc_item_t {
- DEQ_LINKS(qd_alloc_item_t);
uint32_t sequence;
#ifdef QD_MEMORY_DEBUG
qd_alloc_type_desc_t *desc;
uint32_t header;
#endif
};
-DEQ_DECLARE(qd_alloc_item_t, qd_alloc_item_list_t);
+//128 has been chosen because many CPUs arch use an
+//adiacent line prefetching optimization that load
+//2*cache line bytes in batch
+#define CHUNK_SIZE 128/sizeof(void*)
+struct qd_alloc_chunk_t {
Review comment:
define CHUNK_SIZE 128/sizeof(void*) - 2
That way, like you said, one qd_alloc_chunk_t will fit in one Adjacent
Cache-Line Prefetch
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