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

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Date: Mon, 22 Jan 2024 16:07:57 +0100
From: Michal Koutný <mkoutny@...e.com>
To: Waiman Long <longman@...hat.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

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?

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

Thanks,
Michal

[1] https://lore.kernel.org/r/58c87587-417b-1498-185f-1db6bb612c82@redhat.com/

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