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Date:   Tue, 11 Apr 2023 17:08:57 +0200
From:   Michal =?utf-8?Q?Koutn=C3=BD?= <mkoutny@suse.com>
To:     Michal Hocko <mhocko@suse.com>
Cc:     Gang Li <ligang.bdlg@bytedance.com>,
        Waiman Long <longman@redhat.com>, cgroups@vger.kernel.org,
        linux-mm@kvack.org, rientjes@google.com,
        Zefan Li <lizefan.x@bytedance.com>,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4] mm: oom: introduce cpuset oom
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On Tue, Apr 11, 2023 at 03:12:34PM +0200, Michal Hocko <mhocko@suse.com> wr=
ote:
> > Oh I see, you mean scanning all processes in all cpusets and scanning
> > all processes globally are equivalent.
>=20
> Why cannot you simple select a process from the cpuset the allocating
> process belongs to? I thought the whole idea was to handle well
> partitioned workloads.

Ah, I was confused by the top_cpuset implementation.

The iteration should then start in
	nearest_hardwall_ancestor(task_cs(current)).
(in the 1st approximation).

The nodes_intersect/nodes_subset/nodes_equal/whatnot heuristics is
secondary.

HTH,
Michal

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