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Move arena_slab_data_t's nfree into extent_t's e_bits.

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Compact extent_t to 128 bytes on 64-bit systems by moving
arena_slab_data_t's nfree into extent_t's e_bits.

Cacheline-align extent_t structures so that they always cross the
minimum number of cacheline boundaries.

Re-order extent_t fields such that all fields except the slab bitmap
(and overlaid heap profiling context pointer) are in the first
cacheline.

This resolves #461.
This commit is contained in:
Jason Evans 2017-03-27 16:41:47 -07:00
parent af3d737a9a
commit 07f4f93434
6 changed files with 86 additions and 43 deletions
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src/extent.c
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@ -94,7 +94,8 @@ extent_alloc(tsdn_t *tsdn, arena_t *arena) {
extent = extent_list_last(&arena->extent_freelist);
if (extent == NULL) {
malloc_mutex_unlock(tsdn, &arena->extent_freelist_mtx);
return base_alloc(tsdn, arena->base, sizeof(extent_t), QUANTUM);
return base_alloc(tsdn, arena->base, sizeof(extent_t),
CACHELINE);
}
extent_list_remove(&arena->extent_freelist, extent);
malloc_mutex_unlock(tsdn, &arena->extent_freelist_mtx);