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From:   Josh Don <joshdon@google.com>
Date:   Fri, 25 Jun 2021 17:18:05 -0700
Message-ID: <CABk29Ntv_BhG3veC1KdFEoaZ4UWohKAO5GdxoaVD+iOmMGw1_Q@mail.gmail.com>
Subject: Re: [PATCH] sched: cgroup SCHED_IDLE support
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     Ingo Molnar <mingo@redhat.com>, Juri Lelli <juri.lelli@redhat.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
        Daniel Bristot de Oliveira <bristot@redhat.com>,
        Paul Turner <pjt@google.com>,
        David Rientjes <rientjes@google.com>,
        Oleg Rombakh <olegrom@google.com>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        Steve Sistare <steven.sistare@oracle.com>,
        Tejun Heo <tj@kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>
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On Fri, Jun 25, 2021 at 1:15 AM Peter Zijlstra <peterz@infradead.org> wrote:
>
> You should probably also make cpu_weight_*write_?64() return -EINVAL when
> IDLE. Similar to how SCHED_IDLE doesn't do nice.

sched_group_set_shares() returns -EINVAL when called on an idle group.