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Add extent serial numbers.

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Add extent serial numbers and use them where appropriate as a sort key
that is higher priority than address, so that the allocation policy
prefers older extents.

This resolves #147.
This commit is contained in:
Jason Evans 2016-11-14 18:27:23 -08:00
parent 45f83a2ac6
commit 5c77af98b1
10 changed files with 299 additions and 164 deletions
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16
src/huge.c
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@ -56,6 +56,7 @@ huge_palloc(tsdn_t *tsdn, arena_t *arena, size_t usize, size_t alignment,
size_t ausize;
arena_t *iarena;
extent_node_t *node;
size_t sn;
bool is_zeroed;
/* Allocate one or more contiguous chunks for this request. */
@ -68,7 +69,8 @@ huge_palloc(tsdn_t *tsdn, arena_t *arena, size_t usize, size_t alignment,
assert(ausize >= chunksize);
/* Allocate an extent node with which to track the chunk. */
iarena = (!tsdn_null(tsdn)) ? arena_ichoose(tsdn_tsd(tsdn), NULL) : a0get();
iarena = (!tsdn_null(tsdn)) ? arena_ichoose(tsdn_tsd(tsdn), NULL) :
a0get();
node = ipallocztm(tsdn, CACHELINE_CEILING(sizeof(extent_node_t)),
CACHELINE, false, NULL, true, iarena);
if (node == NULL)
@ -82,15 +84,15 @@ huge_palloc(tsdn_t *tsdn, arena_t *arena, size_t usize, size_t alignment,
if (likely(!tsdn_null(tsdn)))
arena = arena_choose(tsdn_tsd(tsdn), arena);
if (unlikely(arena == NULL) || (ret = arena_chunk_alloc_huge(tsdn,
arena, usize, alignment, &is_zeroed)) == NULL) {
arena, usize, alignment, &sn, &is_zeroed)) == NULL) {
idalloctm(tsdn, node, NULL, true, true);
return (NULL);
}
extent_node_init(node, arena, ret, usize, is_zeroed, true);
extent_node_init(node, arena, ret, usize, sn, is_zeroed, true);
if (huge_node_set(tsdn, ret, node)) {
arena_chunk_dalloc_huge(tsdn, arena, ret, usize);
arena_chunk_dalloc_huge(tsdn, arena, ret, usize, sn);
idalloctm(tsdn, node, NULL, true, true);
return (NULL);
}
@ -245,7 +247,8 @@ huge_ralloc_no_move_shrink(tsdn_t *tsdn, void *ptr, size_t oldsize,
malloc_mutex_unlock(tsdn, &arena->huge_mtx);
/* Zap the excess chunks. */
arena_chunk_ralloc_huge_shrink(tsdn, arena, ptr, oldsize, usize);
arena_chunk_ralloc_huge_shrink(tsdn, arena, ptr, oldsize, usize,
extent_node_sn_get(node));
return (false);
}
@ -407,7 +410,8 @@ huge_dalloc(tsdn_t *tsdn, void *ptr)
huge_dalloc_junk(extent_node_addr_get(node),
extent_node_size_get(node));
arena_chunk_dalloc_huge(tsdn, extent_node_arena_get(node),
extent_node_addr_get(node), extent_node_size_get(node));
extent_node_addr_get(node), extent_node_size_get(node),
extent_node_sn_get(node));
idalloctm(tsdn, node, NULL, true, true);
arena_decay_tick(tsdn, arena);