bool
huge_ralloc_no_move(void *ptr, size_t oldsize, size_t size, size_t extra,
bool zero)
{
size_t usize;
/* Both allocations must be huge to avoid a move. */
if (oldsize < chunksize)
return (true);
assert(s2u(oldsize) == oldsize);
usize = s2u(size);
if (usize == 0) {
/* size_t overflow. */
return (true);
}
/*
* Avoid moving the allocation if the existing chunk size accommodates
* the new size.
*/
if (CHUNK_CEILING(oldsize) >= CHUNK_CEILING(usize)
&& CHUNK_CEILING(oldsize) <= CHUNK_CEILING(size+extra)) {
huge_ralloc_no_move_similar(ptr, oldsize, usize, size, extra,
zero);
return (false);
}
/* Shrink the allocation in-place. */
if (CHUNK_CEILING(oldsize) >= CHUNK_CEILING(usize)) {
huge_ralloc_no_move_shrink(ptr, oldsize, usize);
return (false);
}
/* Attempt to expand the allocation in-place. */
if (huge_ralloc_no_move_expand(ptr, oldsize, size + extra, zero)) {
if (extra == 0)
return (true);
/* Try again, this time without extra. */
return (huge_ralloc_no_move_expand(ptr, oldsize, size, zero));
}
return (false);
}
bool
huge_ralloc_no_move(void *ptr, size_t oldsize, size_t usize_min,
size_t usize_max, bool zero)
{
assert(s2u(oldsize) == oldsize);
/* Both allocations must be huge to avoid a move. */
if (oldsize < chunksize || usize_max < chunksize)
return (true);
if (CHUNK_CEILING(usize_max) > CHUNK_CEILING(oldsize)) {
/* Attempt to expand the allocation in-place. */
if (!huge_ralloc_no_move_expand(ptr, oldsize, usize_max, zero))
return (false);
/* Try again, this time with usize_min. */
if (usize_min < usize_max && CHUNK_CEILING(usize_min) >
CHUNK_CEILING(oldsize) && huge_ralloc_no_move_expand(ptr,
oldsize, usize_min, zero))
return (false);
}
/*
* Avoid moving the allocation if the existing chunk size accommodates
* the new size.
*/
if (CHUNK_CEILING(oldsize) >= CHUNK_CEILING(usize_min)
&& CHUNK_CEILING(oldsize) <= CHUNK_CEILING(usize_max)) {
huge_ralloc_no_move_similar(ptr, oldsize, usize_min, usize_max,
zero);
return (false);
}
/* Attempt to shrink the allocation in-place. */
if (CHUNK_CEILING(oldsize) > CHUNK_CEILING(usize_max))
return (huge_ralloc_no_move_shrink(ptr, oldsize, usize_max));
return (true);
}