2013-09-14 15:55:53

by Rik van Riel

Subject: Re: [RFC PATCH] mm: numa: adjust hinting fault record if page is migrated

On 09/14/2013 07:53 AM, Hillf Danton wrote:
> After page A on source node is migrated to page B on target node, hinting
> fault is recorded on the target node for B. On the source node there is
> another record for A, since a two-stage filter is used when migrating pages.
>
> Page A is no longer used after migration, so we have to erase its record.

What kind of performance changes have you observed with this patch?

What benchmarks have you run, and on what kind of systems?

--
All rights reversed

2013-09-15 01:11:28

by Hillf Danton

Subject: Re: [RFC PATCH] mm: numa: adjust hinting fault record if page is migrated

Hello Rik

On Sat, Sep 14, 2013 at 11:55 PM, Rik van Riel <[email protected]> wrote:
> On 09/14/2013 07:53 AM, Hillf Danton wrote:
>> After page A on source node is migrated to page B on target node, hinting
>> fault is recorded on the target node for B. On the source node there is
>> another record for A, since a two-stage filter is used when migrating pages.
>>
>> Page A is no longer used after migration, so we have to erase its record.
>
> What kind of performance changes have you observed with this patch?
>
> What benchmarks have you run, and on what kind of systems?
>
Due to no NUMA box, I can not answer you now.
I will try best to borrow one next Monday.

Thanks
Hillf