Re: [PATCH bpf v3 3/7] bpf: Add sleepable arena page allocation path

["Alexei Starovoitov" <alexei.starovoitov@gmail.com>]

On Fri, Sep 25, 2026 at 08:39 PM Emil Tsalapatis <emil@etsalapatis.com> wrote:
> Since allocation now happens before range-tree arbitration, concurrent
> callers can allocate pages for competing requests. Bound the aggregate
> number of pages in this pre-arbitration window to the configured maximum
> size of the arena.

The pages are allocated with __GFP_ACCOUNT. memcg bounds them already.
Let's drop nr_pages_inflight. Seems like unnecessary complication.

> +out_unmap:
> +	if (sleepable)
> +		flush_vmap_cache(kern_vm_start + uaddr32, mapped << PAGE_SHIFT);
>  	range_tree_set(&arena->rt, pgoff + mapped, page_cnt - mapped);
>  	raw_res_spin_unlock_irqrestore(&arena->spinlock, flags);
> -	if (mapped) {
> -		flush_vmap_cache(kern_vm_start + uaddr32, mapped << PAGE_SHIFT);
> +	if (mapped || sleepable) {
> +		if (!sleepable)
> +			flush_vmap_cache(kern_vm_start + uaddr32, mapped << PAGE_SHIFT);
>  		arena_free_pages(arena, uaddr32, mapped, sleepable);
>  	}

v2 leftovers? It doesn't depend on sleepable ?

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