linux-kernel - Re: [RFC PATCH 4/4] cpuset: Support RCU-NOCB toggle on v2 root partitions

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Message-ID: <YpAHEt0j30vBw9au@slm.duckdns.org>
Date:   Thu, 26 May 2022 13:02:42 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Phil Auld <pauld@...hat.com>,
        Zefan Li <lizefan.x@...edance.com>,
        Waiman Long <longman@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...nel.org>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        rcu@...r.kernel.org
Subject: Re: [RFC PATCH 4/4] cpuset: Support RCU-NOCB toggle on v2 root
 partitions

On Fri, May 27, 2022 at 12:51:41AM +0200, Frederic Weisbecker wrote:
> > Does it even make sense to make this hierarchical? What's wrong with a
> > cpumask under sys/ or proc/?
> 
> I'm usually told that cpusets is the current place where CPU attributes are
> supposed to go. I personally don't mind much /sys either even though cpusets
> looks like a more flexible way to partition CPUs with properties and tasks
> placement altogether...

Yeah, I mean, if it's hierarchical, it's the right place but I have a hard
time seeing anything hierarchical with this one. Somebody just has to know
which cpus are up for rcu processing and which aren't. Waiman, what do you
think?

Thanks.

-- 
tejun