Re: [PATCH v2 0/6] Enhance union-find with KUnit tests and optimization improvements

[Kuan-Wei Chiu]

On Wed, Oct 09, 2024 at 02:09:51AM -0700, Christoph Hellwig wrote:
> On Mon, Oct 07, 2024 at 11:28:27PM +0800, Kuan-Wei Chiu wrote:
> > This patch series adds KUnit tests for the union-find implementation
> > and optimizes the path compression in the uf_find() function to achieve
> > a lower tree height and improved efficiency. Additionally, it modifies
> > uf_union() to return a boolean value indicating whether a merge
> > occurred, enhancing the process of calculating the number of groups in
> > the cgroup cpuset.
> 
> Given that this fairly special union find code is obly used in the
> cpuset code, please move the code there rather adding more exports.
> Even as-is it is bloating every kernel build even without cgroups
> for no good reason.
>
I noticed that it was Michal who originally suggested putting the
union-find code to lib/ in an earlier email thread [1]. Before I send a v3
patch moving it to cpuset, I'd like to hear Michal, Tejun, and Waiman’s
thoughts on this change.

[1]: https://lore.kernel.org/lkml/wu4m2m5igc752s5vrmtsnd7ekaq6opeqdtrzegs7oxlwgypdcx@qhcnow5txxiv/

Regards,
Kuan-Wei