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

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Message-ID: <ZagJPoEsLZ6Dg-NG@mtj.duckdns.org>
Date: Wed, 17 Jan 2024 07:07:10 -1000
From: Tejun Heo <tj@...nel.org>
To: Waiman Long <longman@...hat.com>
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

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.

Thanks.

-- 
tejun