linux-kernel - Re: [PATCH 2/2] sched/deadline: Correctly account for allocated bandwidth during hotplug

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Message-ID: <b7c75f06-1ab5-48c4-b2fb-521508f20f9b@redhat.com>
Date: Wed, 13 Nov 2024 11:42:23 -0500
From: Waiman Long <llong@...hat.com>
To: Juri Lelli <juri.lelli@...hat.com>, Waiman Long <llong@...hat.com>
Cc: Tejun Heo <tj@...nel.org>, Johannes Weiner <hannes@...xchg.org>,
 Michal Koutny <mkoutny@...e.com>, Ingo Molnar <mingo@...hat.com>,
 Peter Zijlstra <peterz@...radead.org>,
 Vincent Guittot <vincent.guittot@...aro.org>,
 Dietmar Eggemann <dietmar.eggemann@....com>,
 Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>,
 Mel Gorman <mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>,
 Qais Yousef <qyousef@...alina.io>,
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 "Joel Fernandes (Google)" <joel@...lfernandes.org>,
 Suleiman Souhlal <suleiman@...gle.com>, Aashish Sharma <shraash@...gle.com>,
 Shin Kawamura <kawasin@...gle.com>,
 Vineeth Remanan Pillai <vineeth@...byteword.org>,
 linux-kernel@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [PATCH 2/2] sched/deadline: Correctly account for allocated
 bandwidth during hotplug


On 11/13/24 11:40 AM, Juri Lelli wrote:
> On 13/11/24 11:06, Waiman Long wrote:
>
> ...
>
>> This part can still cause a failure in one of test cases in my cpuset
>> partition test script. In this particular case, the CPU to be offlined is an
>> isolated CPU with scheduling disabled. As a result, total_bw is 0 and the
>> __dl_overflow() test failed. Is there a way to skip the __dl_overflow() test
>> for isolated CPUs? Can we use a null total_bw as a proxy for that?
> Can you please share the repro script? Would like to check locally what
> is going on.

Just run tools/testing/selftests/cgroup/test_cpuset_prs.sh.

Cheers,
Longman