linux-kernel - Re: [PATCH 2/8] workqueue: Decouple HK_FLAG_WQ and HK_FLAG

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Date:   Fri, 7 Jan 2022 11:22:33 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Alex Belits <abelits@...vell.com>,
        Nitesh Lal <nilal@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Nicolas Saenz <nsaenzju@...hat.com>,
        Christoph Lameter <cl@...two.de>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Zefan Li <lizefan.x@...edance.com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: Re: [PATCH 2/8] workqueue: Decouple HK_FLAG_WQ and HK_FLAG_DOMAIN
 cpumask fetch

On Tue, Jan 04, 2022 at 03:49:38PM +0100, Frederic Weisbecker wrote:
> To prepare for supporting each feature of the housekeeping cpumask
> toward cpuset, prepare each of the HK_FLAG_* entries to move to their
> own cpumask with enforcing to fetch them individually. The new
> constraint is that multiple HK_FLAG_* entries can't be mixed together
> anymore in a single call to housekeeping cpumask().
> 
> This will later allow, for example, to runtime modify the cpulist passed
> through "isolcpus=", "nohz_full=" and "rcu_nocbs=" kernel boot
> parameters.
> 
> Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Juri Lelli <juri.lelli@...hat.com>
> Cc: Marcelo Tosatti <mtosatti@...hat.com>
> Cc: Nitesh Lal <nilal@...hat.com>
> Cc: Nicolas Saenz <nsaenzju@...hat.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Christoph Lameter <cl@...two.de>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Zefan Li <lizefan.x@...edance.com>
> Cc: Alex Belits <abelits@...vell.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun