On Wed, 12 Nov 2025 11:19:51 GMT, Maurizio Cimadamore <[email protected]> wrote:
> Then, we have three cases: > > * if the requested alignment `A` is `A <= MIN_ALIGN`, we can just > allocate and don't adjust for alignment > > * if the requested alignment `A` is `MIN_ALIGN < A <= MAX_ALIGN` and the > requested size is a multiple of the alignment, also just allocate and don't > adjust for alignment > > * otherwise, allocate a bigger segment and manually align the result If we can't establish a min alignment, we could at least have some way to determine the max alignment (I'd say probably 16 is a good number because of system ABI?), and then just use two rules: * if the requested alignment `A` is `A <= MAX_ALIGN` **and** the requested size is a multiple of the alignment, also just allocate and don't adjust for alignment * otherwise, allocate a bigger segment and manually align the result This should still deliver the kind of compaction we were aiming for with the optimization, but hopefully get there in a more portable way? ------------- PR Comment: https://git.openjdk.org/jdk/pull/28235#issuecomment-3521457435
