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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 2016-11-15 13:07:53 -08:00
parent c0a667112c
commit a38acf716e
7 changed files with 126 additions and 35 deletions
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27
src/arena.c
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@ -760,7 +760,7 @@ arena_purge_to_limit(tsdn_t *tsdn, arena_t *arena, size_t ndirty_limit)
size_t ndirty = arena_dirty_count(tsdn, arena);
assert(ndirty == arena->ndirty);
}
extent_init(&purge_extents_sentinel, arena, NULL, 0, 0, false, false,
extent_init(&purge_extents_sentinel, arena, NULL, 0, 0, 0, false, false,
false, false);
npurge = arena_stash_dirty(tsdn, arena, &extent_hooks, ndirty_limit,
@ -1351,12 +1351,12 @@ arena_bin_lower_slab(tsdn_t *tsdn, arena_t *arena, extent_t *slab,
assert(extent_slab_data_get(slab)->nfree > 0);
/*
* Make sure that if bin->slabcur is non-NULL, it refers to the lowest
* non-full slab. It is okay to NULL slabcur out rather than
* proactively keeping it pointing at the lowest non-full slab.
* Make sure that if bin->slabcur is non-NULL, it refers to the
* oldest/lowest non-full slab. It is okay to NULL slabcur out rather
* than proactively keeping it pointing at the oldest/lowest non-full
* slab.
*/
if (bin->slabcur != NULL && (uintptr_t)extent_addr_get(slab) <
(uintptr_t)extent_addr_get(bin->slabcur)) {
if (bin->slabcur != NULL && extent_snad_comp(bin->slabcur, slab) > 0) {
/* Switch slabcur. */
if (extent_slab_data_get(bin->slabcur)->nfree > 0)
arena_bin_slabs_nonfull_insert(bin, bin->slabcur);
@ -1651,6 +1651,13 @@ arena_nthreads_dec(arena_t *arena, bool internal)
atomic_sub_u(&arena->nthreads[internal], 1);
}
size_t
arena_extent_sn_next(arena_t *arena)
{
return (atomic_add_zu(&arena->extent_sn_next, 1) - 1);
}
arena_t *
arena_new(tsdn_t *tsdn, unsigned ind)
{
@ -1684,6 +1691,8 @@ arena_new(tsdn_t *tsdn, unsigned ind)
(size_t)(uintptr_t)arena;
}
arena->extent_sn_next = 0;
arena->dss_prec = extent_dss_prec_get();
arena->purging = false;
@ -1702,7 +1711,7 @@ arena_new(tsdn_t *tsdn, unsigned ind)
extent_heap_new(&arena->extents_retained[i]);
}
extent_init(&arena->extents_dirty, arena, NULL, 0, 0, false, false,
extent_init(&arena->extents_dirty, arena, NULL, 0, 0, 0, false, false,
false, false);
if (malloc_mutex_init(&arena->extents_mtx, "arena_extents",
@ -1724,8 +1733,8 @@ arena_new(tsdn_t *tsdn, unsigned ind)
return (NULL);
bin->slabcur = NULL;
extent_heap_new(&bin->slabs_nonfull);
extent_init(&bin->slabs_full, arena, NULL, 0, 0, false, false,
false, false);
extent_init(&bin->slabs_full, arena, NULL, 0, 0, 0, false,
false, false, false);
if (config_stats)
memset(&bin->stats, 0, sizeof(malloc_bin_stats_t));
}