On Tue, 10 Oct 2017 19:51:43 +0200 Michal Hocko <mhocko@xxxxxxxxxx> wrote: > On Tue 10-10-17 08:39:47, Dave Hansen wrote: > > On 10/10/2017 07:57 AM, Michal Hocko wrote: > > >> 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? > > > > They're the reason we started looking at this. They also care the most. > > > > But, the cost of these stats, especially we get more and more cores in a > > NUMA node is really making them show up in profiles. It would be nice > > to get rid of them there, too. > > I am not opposing to the auto mode. I am just not sure it is a safe > default and I also think that we should add this on top if it is really > needed. Yup. Let's keep things simple unless a real need is demonstrated, please.
