lkml.org 
[lkml]   [2017]   [Oct]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH] mm, swap: Make VMA based swap readahead configurable
On Tue, Oct 3, 2017 at 5:49 AM, Andrew Morton <akpm@linux-foundation.org> wrote:
> 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.

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

\
 
 \ /
  Last update: 2017-10-06 14:29    [W:0.059 / U:0.556 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site