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SubjectRE: [RFC PATCH 5/5] mm, page_alloc: Introduce ZONELIST_FALLBACK_SAME_TYPE fallback list

>-----Original Message-----
>From: [] On
>Behalf Of Michal Hocko
>Sent: Thursday, April 25, 2019 4:10 PM
>To: Du, Fan <>
>Cc:; Wu, Fengguang <>;
>Williams, Dan J <>; Hansen, Dave
><>;; Huang, Ying
>Subject: Re: [RFC PATCH 5/5] mm, page_alloc: Introduce
>On Thu 25-04-19 07:55:58, Du, Fan wrote:
>> >> PMEM is good for frequently read accessed page, e.g. page cache(implicit
>> >> page
>> >> request), or user space data base (explicit page request)
>> >> For now this patch create GFP_SAME_NODE_TYPE for such cases,
>> >> Implementation will be followed up.
>> >
>> >Then simply configure that NUMA node as movable and you get these
>> >allocations for any movable allocation. I am not really convinced a new
>> >gfp flag is really justified.
>> Case 1: frequently write and/or read accessed page deserved to DRAM
>NUMA balancing

Sorry, I mean page cache case here.
Numa balancing works for pages mapped in pagetable style.

>> Case 2: frequently read accessed page deserved to PMEM
>memory reclaim to move those pages to a more distant node (e.g. a PMEM).
>Btw. none of the above is a static thing you would easily know at the
>allocation time.
>Please spare some time reading surrounding discussions - e.g.

Thanks for the point.

>Michal Hocko
>SUSE Labs

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