Re: [PATCH v3] mm, sysctl: make NUMA stats configurable

[Michal Hocko]

On Tue 10-10-17 07:53:50, Dave Hansen wrote:
> On 10/10/2017 07:31 AM, Michal Hocko wrote:
> > On Tue 10-10-17 07:29:31, Dave Hansen wrote:
> >> On 10/09/2017 10:49 PM, Michal Hocko wrote:
> >>> Anyway I still stand by my position that this sounds over-engineered and
> >>> a simple 0/1 resp. on/off interface would be both simpler and safer. If
> >>> anybody wants an auto mode it can be added later (as a value 2 resp.
> >>> auto).
> >>
> >> 0/1 with the default set to the strict, slower mode?
> > 
> > yes, keep the current semantic and allow users who care to disable
> > something that stands in the way.
> 
> But, let's be honest, this leaves us with an option that nobody is ever
> going to turn on.  IOW, nobody except a very small portion of our users
> will ever see any benefit from this.

But aren't those small groups who would like to squeeze every single
cycle out from the page allocator path the targeted audience?
-- 
Michal Hocko
SUSE Labs