Re: [PATCH 2/5] zsmalloc: Consolidate zs_pool's migrate_lock and size_class's locks

[Johannes Weiner]

On Wed, Oct 26, 2022 at 01:06:10PM -0700, Nhat Pham wrote:
> Currently, zsmalloc has a hierarchy of locks, which includes a
> pool-level migrate_lock, and a lock for each size class. We have to
> obtain both locks in the hotpath in most cases anyway, except for
> zs_malloc. This exception will no longer exist when we introduce a LRU
> into the zs_pool for the new writeback functionality - we will need to
> obtain a pool-level lock to synchronize LRU handling even in zs_malloc.
> 
> In preparation for zsmalloc writeback, consolidate these locks into a
> single pool-level lock, which drastically reduces the complexity of
> synchronization in zsmalloc.
> 
> Suggested-by: Johannes Weiner <hannes@xxxxxxxxxxx>
> Signed-off-by: Nhat Pham <nphamcs@xxxxxxxxx>

Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>