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Prefer old/low extent_t structures during reuse.

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Rather than using a LIFO queue to track available extent_t structures,
use a red-black tree, and always choose the oldest/lowest available
during reuse.
This commit is contained in:
Jason Evans
2017-04-16 22:31:16 -07:00
parent 76b35f4b2f
commit 881fbf762f
10 changed files with 80 additions and 37 deletions
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21
src/extent.c
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@@ -88,20 +88,21 @@ static void extent_record(tsdn_t *tsdn, arena_t *arena,
/******************************************************************************/
rb_gen(UNUSED, extent_avail_, extent_tree_t, extent_t, rb_link,
extent_esnead_comp)
extent_t *
extent_alloc(tsdn_t *tsdn, arena_t *arena) {
extent_t *extent;
witness_assert_depth_to_rank(tsdn, WITNESS_RANK_CORE, 0);
malloc_mutex_lock(tsdn, &arena->extent_freelist_mtx);
extent = extent_list_last(&arena->extent_freelist);
malloc_mutex_lock(tsdn, &arena->extent_avail_mtx);
extent_t *extent = extent_avail_first(&arena->extent_avail);
if (extent == NULL) {
malloc_mutex_unlock(tsdn, &arena->extent_freelist_mtx);
malloc_mutex_unlock(tsdn, &arena->extent_avail_mtx);
return base_alloc_extent(tsdn, arena->base);
}
extent_list_remove(&arena->extent_freelist, extent);
malloc_mutex_unlock(tsdn, &arena->extent_freelist_mtx);
extent_avail_remove(&arena->extent_avail, extent);
malloc_mutex_unlock(tsdn, &arena->extent_avail_mtx);
return extent;
}
@@ -109,9 +110,9 @@ void
extent_dalloc(tsdn_t *tsdn, arena_t *arena, extent_t *extent) {
witness_assert_depth_to_rank(tsdn, WITNESS_RANK_CORE, 0);
malloc_mutex_lock(tsdn, &arena->extent_freelist_mtx);
extent_list_append(&arena->extent_freelist, extent);
malloc_mutex_unlock(tsdn, &arena->extent_freelist_mtx);
malloc_mutex_lock(tsdn, &arena->extent_avail_mtx);
extent_avail_insert(&arena->extent_avail, extent);
malloc_mutex_unlock(tsdn, &arena->extent_avail_mtx);
}
extent_hooks_t *