>-----Original Message----- >From: owner-linux-mm@xxxxxxxxx [mailto:owner-linux-mm@xxxxxxxxx] On >Behalf Of Michal Hocko >Sent: Thursday, April 25, 2019 4:10 PM >To: Du, Fan <fan.du@xxxxxxxxx> >Cc: akpm@xxxxxxxxxxxxxxxxxxxx; Wu, Fengguang <fengguang.wu@xxxxxxxxx>; >Williams, Dan J <dan.j.williams@xxxxxxxxx>; Hansen, Dave ><dave.hansen@xxxxxxxxx>; xishi.qiuxishi@xxxxxxxxxxxxxxx; Huang, Ying ><ying.huang@xxxxxxxxx>; linux-mm@xxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx >Subject: Re: [RFC PATCH 5/5] mm, page_alloc: Introduce >ZONELIST_FALLBACK_SAME_TYPE fallback list > >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, >additional >> >> 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. >http://lkml.kernel.org/r/1554955019-29472-1-git-send-email-yang.shi@linux.a >libaba.com Thanks for the point. >Michal Hocko >SUSE Labs
