Re: [PATCH 1/8] mm: use zone lock guard in reserve_highatomic_pageblock()

[Andrew Morton]

On Fri, 6 Mar 2026 19:24:56 +0100 Vlastimil Babka <vbabka@xxxxxxxxxx> wrote:

> >> 
> >> Is it worth it?
> > 
> > This is being done all over the kernel. Perhaps we should look at ways to
> > make the generic infrastructure more performant?
> 
> Yeah I don't think the guard construct in this case should be doing anything
> here that wouldn't allow the compiler to compile to the exactly same result
> as before? Either there's some problem with the infra, or we're just victim
> of compiler heuristics.

Sure, it'd be good to figure this out.

> In both cases imho worth looking into rather than
> rejecting the construct.

I'm not enjoying the ides of penalizing billions of machines all of the
time in order to make life a little easier for the developers.  Seems
like a poor tradeoff.