linux-kernel - Re: [PATCH 10/10] mm/migrate: new zone_reclaim

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Message-ID: <3cee267e-6a5b-a5a3-698b-4261bef13543@intel.com>
Date:   Tue, 9 Mar 2021 13:53:13 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Yang Shi <shy828301@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        David Rientjes <rientjes@...gle.com>,
        Huang Ying <ying.huang@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        David Hildenbrand <david@...hat.com>,
        Oscar Salvador <osalvador@...e.de>
Subject: Re: [PATCH 10/10] mm/migrate: new zone_reclaim_mode to enable reclaim
 migration

On 3/8/21 4:24 PM, Yang Shi wrote:
>> Once this is enabled page demotion may move data to a NUMA node
>> that does not fall into the cpuset of the allocating process.
>> This could be construed to violate the guarantees of cpusets.
>> However, since this is an opt-in mechanism, the assumption is
>> that anyone enabling it is content to relax the guarantees.
> I think we'd better have the cpuset violation paragraph along with new
> zone reclaim mode text so that the users are aware of the potential
> violation. I don't think commit log is the to-go place for any plain
> users.
> 

Agreed.  I'll add it to the Documentation/.