Re: [RFC 1/8] mm: add overflow and underflow checks for page->_refcount

[Pasha Tatashin]

On Tue, Oct 26, 2021 at 11:05 PM Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote:
>
> On Tue, Oct 26, 2021 at 09:21:29PM -0400, Pasha Tatashin wrote:
> > I think we can do that by using:
> > atomic_fetch_*() and check for overflow/underflow after operation. I
> > will send the updated series soon.
>
> Please include performance measurements.  You're adding code to some hot
> paths.

I will do boot performance tests to ensure we do not regress
initializing "struct pages" on larger machines. Do you have a
suggestion for another perf test?

Thanks,
Pasha