linux-kernel - Re: [PATCH 1/2] cpuset: Fix cpuset_cpus_allowed() to not filter offline CPUs

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Message-ID: <5a1a6e1f-2d19-e2ff-8f2c-63d185aa057b@redhat.com>
Date:   Wed, 1 Feb 2023 14:17:59 -0500
From:   Waiman Long <longman@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com, Zefan Li <lizefan.x@...edance.com>,
        Tejun Heo <tj@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.org
Subject: Re: [PATCH 1/2] cpuset: Fix cpuset_cpus_allowed() to not filter
 offline CPUs

On 2/1/23 14:14, Waiman Long wrote:
> One possible solution is to use cpuset_cpus_allowed_fallback() in case 
> none of the cpus in the current cpuset is allowed to be used to run a 
> given task.

It looks like we will need to enhance cpuset_cpus_allowed_fallback() to 
walk up cpuset tree to find one that have useable cpus.

Cheers,
Longman