On Tue, Oct 3, 2017 at 5:49 AM, Andrew Morton <[email protected]> wrote: > On Mon, 2 Oct 2017 08:45:40 -0700 Dave Hansen <[email protected]> wrote: > >> On 09/27/2017 06:02 PM, Huang, Ying wrote: >> > I still think there may be a performance regression for some users >> > because of the change of the algorithm and the knobs, and the >> > performance regression can be resolved via setting the new knob. But I >> > don't think there will be a functionality regression. Do you agree? >> >> A performance regression is a regression. I don't understand why we are >> splitting hairs as to what kind of regression it is. >> > > Yes. > > Ying, please find us a way of avoiding any disruption to existing > system setups. One which doesn't require that the operator perform a > configuration change to restore prior behaviour/performance.
Sorry for late. I am in holiday recently. OK. For me, I think the most clean way is to use page_cluster to control both the virtual and physical swap readahead. If you are OK with that, I will prepare the patch. > And please let's get this done well in advance of the 4.14 release. Sure. Best Regards, Huang, Ying
