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Fix/simplify extent_recycle() allocation size computations.

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Do not call s2u() during alloc_size computation, since any necessary
ceiling increase is taken care of later by extent_first_best_fit() -->
extent_size_quantize_ceil(), and the s2u() call may erroneously cause a
higher quantization result.

Remove an overly strict overflow check that was added in
4a7852137d (Fix extent_recycle()'s
cache-oblivious padding support.).
This commit is contained in:
Jason Evans 2016-11-03 23:49:21 -07:00
parent 4a7852137d
commit a967fae362
1 changed files with 5 additions and 6 deletions
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11
src/extent.c
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@ -405,6 +405,7 @@ extent_recycle(tsdn_t *tsdn, arena_t *arena, extent_hooks_t **r_extent_hooks,
malloc_mutex_assert_owner(tsdn, &arena->extents_mtx);
assert(new_addr == NULL || !slab);
assert(pad == 0 || !slab);
assert(alignment > 0);
if (config_debug && new_addr != NULL) {
extent_t *prev;
@ -427,13 +428,11 @@ extent_recycle(tsdn_t *tsdn, arena_t *arena, extent_hooks_t **r_extent_hooks,
assert(prev == NULL || extent_past_get(prev) == new_addr);
}
alloc_size = ((new_addr != NULL) ? usize : s2u(usize +
PAGE_CEILING(alignment) - PAGE)) + pad;
if (alloc_size > LARGE_MAXCLASS + pad || alloc_size < usize) {
/* Too large, possibly wrapped around. */
return (NULL);
}
size = usize + pad;
alloc_size = size + PAGE_CEILING(alignment) - PAGE;
/* Beware size_t wrap-around. */
if (alloc_size < usize)
return (NULL);
if (!locked)
malloc_mutex_lock(tsdn, &arena->extents_mtx);
extent_hooks_assure_initialized(arena, r_extent_hooks);