Re: [PATCH splitout] mm: memory-failure: serialize TestSetPageHWPoison with zone->lock

[Michael S. Tsirkin]

On Tue, Jun 16, 2026 at 08:56:42AM +0200, David Hildenbrand (Arm) wrote:
> >>
> >>
> >> Assume that we enlighten all non-atomics to grab the rcu read lock, such as
> > 
> > These non-atomics are defined and used because they want to avoid atomic ops overhead?
> > So I'm afraid using rcu read lock in these places would lead to unexpected overhead.
> 
> It should be cheaper than atomics IIUC. Further, I assume that some pages could
> batch over multiple such operations (esp. page freeing path when we process tail
> pages).

Doubt we have the energy to bother with this much.
We'll have to stick them in the bit manipulation macros if memory failure is
configured and be done with it.

-- 
MST