Re: [PATCH v2 for v5.9] mm/page_alloc: handle a missing case for memalloc_nocma_{save/restore} APIs

[Andrew Morton]

On Tue, 29 Sep 2020 10:28:05 +0900 Joonsoo Kim <js1304@xxxxxxxxx> wrote:

> > What about manually emptying the pcplists beforehand?
> 
> It also increases the probability. schedule() or interrupt after emptying but
> before the allocation could invalidate the effect.

Keep local interrupts disabled across the pcp drain and the allocation
attempt.

> > Or byassing the pcplists for this caller and calling __rmqueue() directly?
> 
> What this patch does is this one.

I meant via a different function rather than by adding overhead to the
existing commonly-used function.