linux-kernel - Re: [PATCH v4] mm: oom: introduce cpuset oom

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Message-ID: <wmy3re5x2olokij77xfleomlydc7p2zczas6dagtawrl2mvh5a@d3ipt4hgqgr2>
Date:   Tue, 11 Apr 2023 17:08:57 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     Michal Hocko <mhocko@...e.com>
Cc:     Gang Li <ligang.bdlg@...edance.com>,
        Waiman Long <longman@...hat.com>, cgroups@...r.kernel.org,
        linux-mm@...ck.org, rientjes@...gle.com,
        Zefan Li <lizefan.x@...edance.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] mm: oom: introduce cpuset oom

On Tue, Apr 11, 2023 at 03:12:34PM +0200, Michal Hocko <mhocko@...e.com> wrote:
> > Oh I see, you mean scanning all processes in all cpusets and scanning
> > all processes globally are equivalent.
> 
> 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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