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

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Message-ID: <c30adf62-3012-46fe-ae52-2f6de1e20718@redhat.com>
Date: Wed, 13 Nov 2024 11:50:05 -0500
From: Waiman Long <llong@...hat.com>
To: Waiman Long <llong@...hat.com>, Juri Lelli <juri.lelli@...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 11:42 AM, Waiman Long wrote:
>
> 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.

The failing test is

         # Remote partition offline tests
         " C0-3:S+ C1-3:S+ C2-3     .    X2-3   X2-3 X2-3:P2:O2=0 .   0 
A1:0-1,A2:1,A3:3 A1:P0,A3:P2 2-3"

You can remove all the previous lines in the TEST_MATRIX to get to 
failed test case immediately eliminating unnecessary noise in your testing.

Cheers,
Longman