Re: [PATCH] block: partitions: replace __get_free_page() with kmalloc()

[Christoph Hellwig]

On Mon, May 25, 2026 at 12:35:56PM +0300, Mike Rapoport wrote:
> > This does, but it still fails to explain why kmalloc performs just as
> > well as __get_free_page(s) these days.
> 
> I don't think that in this case - a single allocation on the cold path -
> the performance difference is even measurable.

Well, please state that.

> Nevertheless allocations from slab caches are way faster than
> __get_free_page() (i.e.  alloc_pages()) as it's essentially lockless
> cmpxchg. Allocations that need to refill the cache do alloc_pages() with a
> little of slab bookkeeping overhead.

Please state that too.