Messages in this thread | | | Date | Mon, 2 Oct 2017 14:49:03 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH] mm, swap: Make VMA based swap readahead configurable |
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On Mon, 2 Oct 2017 08:45:40 -0700 Dave Hansen <dave.hansen@intel.com> 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. And please let's get this done well in advance of the 4.14 release.
Thanks.
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