Re: [PATCH 2/4] mm: move per-vma lock into vm_area_struct

[Vlastimil Babka <vbabka@suse.cz>]

On 11/11/24 21:55, Suren Baghdasaryan wrote:
> @@ -511,7 +476,6 @@ void __vm_area_free(struct vm_area_struct *vma)
>  {
>  	vma_numab_state_free(vma);
>  	free_anon_vma_name(vma);
> -	vma_lock_free(vma);
>  	kmem_cache_free(vm_area_cachep, vma);
>  }

Have you investigated if this allows to perform vma_numab_state_free() and
free_anon_vma_name() immediately, and only kfree_rcu() the vma itself,
instead of performing all this in a call_rcu() callback?

Of course if we succeed converting vma's to SLAB_TYPESAFE_RCU this immediate
freeing of numab state and anon_vma_name would be implied, but maybe it's an
useful intermediate step on its own.