On 5/7/25 12:55 AM, Shakeel Butt wrote:

The per-cpu stock_lock protects cached memcg and cached objcg and their
respective fields. However there is no dependency between these fields
and it is better to have fine grained separate locks for cached memcg
and cached objcg. This decoupling of locks allows us to make the memcg
charge cache and objcg charge cache to be nmi safe independently.

At the moment, memcg charge cache is already nmi safe and this
decoupling will allow to make memcg charge cache work without disabling
irqs.

Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev>

Reviewed-by: Vlastimil Babka <redacted>