linux-kernel - Re: [RFC PATCH 0/8] cgroup/cpuset: Support RCU

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Date: Wed, 17 Jan 2024 12:15:07 -0500
From: Waiman Long <longman@...hat.com>
To: Tejun Heo <tj@...nel.org>
Cc: Zefan Li <lizefan.x@...edance.com>, Johannes Weiner <hannes@...xchg.org>,
 Frederic Weisbecker <frederic@...nel.org>, Jonathan Corbet <corbet@....net>,
 "Paul E. McKenney" <paulmck@...nel.org>,
 Neeraj Upadhyay <quic_neeraju@...cinc.com>,
 Joel Fernandes <joel@...lfernandes.org>,
 Josh Triplett <josh@...htriplett.org>, Boqun Feng <boqun.feng@...il.com>,
 Steven Rostedt <rostedt@...dmis.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Lai Jiangshan <jiangshanlai@...il.com>, Zqiang <qiang.zhang1211@...il.com>,
 Davidlohr Bueso <dave@...olabs.net>, Shuah Khan <shuah@...nel.org>,
 cgroups@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, rcu@...r.kernel.org,
 linux-kselftest@...r.kernel.org, Mrunal Patel <mpatel@...hat.com>,
 Ryan Phillips <rphillips@...hat.com>, Brent Rowsell <browsell@...hat.com>,
 Peter Hunt <pehunt@...hat.com>, Cestmir Kalina <ckalina@...hat.com>,
 Nicolas Saenz Julienne <nsaenz@...nel.org>,
 Alex Gladkov <agladkov@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
 Phil Auld <pauld@...hat.com>, Paul Gortmaker <paul.gortmaker@...driver.com>,
 Daniel Bristot de Oliveira <bristot@...nel.org>,
 Juri Lelli <juri.lelli@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
 Costa Shulyupin <cshulyup@...hat.com>
Subject: Re: [RFC PATCH 0/8] cgroup/cpuset: Support RCU_NOCB on isolated
 partitions

On 1/17/24 12:07, Tejun Heo wrote:
> Hello,
>
> On Wed, Jan 17, 2024 at 11:35:03AM -0500, Waiman Long wrote:
>> The first 2 patches are adopted from Federic with minor twists to fix
>> merge conflicts and compilation issue. The rests are for implementing
>> the new cpuset.cpus.isolation_full interface which is essentially a flag
>> to globally enable or disable full CPU isolation on isolated partitions.
> I think the interface is a bit premature. The cpuset partition feature is
> already pretty restrictive and makes it really clear that it's to isolate
> the CPUs. I think it'd be better to just enable all the isolation features
> by default. If there are valid use cases which can't be served without
> disabling some isolation features, we can worry about adding the interface
> at that point.

My current thought is to make isolated partitions act like 
isolcpus=domain, additional CPU isolation capabilities are optional and 
can be turned on using isolation_full. However, I am fine with making 
all these turned on by default if it is the consensus.

Cheers,
Longman