Re: [PATCH net-next v6 04/18] mm: Make the page_frag_cache allocator use per-cpu

[Christoph Hellwig]

On Tue, Apr 11, 2023 at 05:08:48PM +0100, David Howells wrote:
> Make the page_frag_cache allocator have a separate allocation bucket for
> each cpu to avoid racing.  This means that no lock is required, other than
> preempt disablement, to allocate from it, though if a softirq wants to
> access it, then softirq disablement will need to be added.

Can you show any performance numbers?

> Make the NVMe, mediatek and GVE drivers pass in NULL to page_frag_cache()
> and use the default allocation buckets rather than defining their own.

Let me ask a third time as I've not got an answer the last two times:
why are these callers treated different from the others?