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Date: Mon, 31 Oct 2022 09:40:15 +0100 From: Michal Hocko <mhocko@...e.com> To: "Huang, Ying" <ying.huang@...el.com> Cc: Feng Tang <feng.tang@...el.com>, Aneesh Kumar K V <aneesh.kumar@...ux.ibm.com>, Andrew Morton <akpm@...ux-foundation.org>, Johannes Weiner <hannes@...xchg.org>, Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>, Waiman Long <longman@...hat.com>, "linux-mm@...ck.org" <linux-mm@...ck.org>, "cgroups@...r.kernel.org" <cgroups@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Hansen, Dave" <dave.hansen@...el.com>, "Chen, Tim C" <tim.c.chen@...el.com>, "Yin, Fengwei" <fengwei.yin@...el.com> Subject: Re: [PATCH] mm/vmscan: respect cpuset policy during page demotion On Fri 28-10-22 07:22:27, Huang, Ying wrote: > Michal Hocko <mhocko@...e.com> writes: > > > On Thu 27-10-22 17:31:35, Huang, Ying wrote: [...] > >> I think that it's possible for different processes have different > >> requirements. > >> > >> - Some processes don't care about where the memory is placed, prefer > >> local, then fall back to remote if no free space. > >> > >> - Some processes want to avoid cross-socket traffic, bind to nodes of > >> local socket. > >> > >> - Some processes want to avoid to use slow memory, bind to fast memory > >> node only. > > > > Yes, I do understand that. Do you have any specific examples in mind? > > [...] > > Sorry, I don't have specific examples. OK, then let's stop any complicated solution right here then. Let's start simple with a per-mm flag to disable demotion of an address space. Should there ever be a real demand for a more fine grained solution let's go further but I do not think we want a half baked solution without real usecases. -- Michal Hocko SUSE Labs
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