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

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Date: Mon, 22 Jan 2024 21:50:40 -0800
From: Waiman Long <longman@...hat.com>
To: Michal Koutný <mkoutny@...e.com>
Cc: Tejun Heo <tj@...nel.org>, 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 1/22/24 10:07, Michal Koutný wrote:
> Hello Waiman.
>
> On Wed, Jan 17, 2024 at 11:35:03AM -0500, Waiman Long <longman@...hat.com> wrote:
>> This patch series is based on the RFC patch from Frederic [1]. Instead
>> of offering RCU_NOCB as a separate option, it is now lumped into a
>> root-only cpuset.cpus.isolation_full flag that will enable all the
>> additional CPU isolation capabilities available for isolated partitions
>> if set. RCU_NOCB is just the first one to this party. Additional dynamic
>> CPU isolation capabilities will be added in the future.
> IIUC this is similar to what I suggested back in the day and you didn't
> consider it [1]. Do I read this right that you've changed your mind?

I didn't said that we were not going to do this at the time. It's just 
that more evaluation will need to be done before we are going to do 
this. I was also looking to see if there were use cases where such 
capabilities were needed. Now I am aware that such use cases do exist 
and we should start looking into it.

>
> (It's fine if you did, I'm only asking to follow the heading of cpuset
> controller.)

OK, the title of the cover-letter may be too specific. I will make it 
more general in the next version.

Cheers,
Longman