linux-kernel - Re: [PATCH 0/8] sched/isolation: Split housekeeping cpumask

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Date:   Mon, 10 Jan 2022 17:51:09 +0100
From:   Juri Lelli <juri.lelli@...hat.com>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
        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 0/8] sched/isolation: Split housekeeping cpumask

Hi,

On 04/01/22 15:49, Frederic Weisbecker wrote:
> Hi,
> 
> To prepare for extending cpusets to control CPU isolation features
> (nohz_full, rcu_nocbs, unbound timers, workqueues, kthreads affinity...),
> we need to split the global housekeeping_mask to one cpumask per isolation
> feature.
> 
> Doing so is quite a chunk already so I'm working on that as a standalone
> patchset. Once that get merged, the next step is to finally provide a
> cpuset interface for one of these isolation features: rcu_nocb could
> be interesting to handle first as nohz_full depends on it.
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
> 	isolation/split
> 
> HEAD: 2c07a16ff50d1e722babee28b926d70522e6bd3e
> 
> Thanks,
> 	Frederic
> ---
> 
> Frederic Weisbecker (8):
>       pci: Decouple HK_FLAG_WQ and HK_FLAG_DOMAIN cpumask fetch
>       workqueue: Decouple HK_FLAG_WQ and HK_FLAG_DOMAIN cpumask fetch
>       net: Decouple HK_FLAG_WQ and HK_FLAG_DOMAIN cpumask fetch
>       sched/isolation: Use single feature type while referring to housekeeping cpumask
>       sched/isolation: Consolidate check for housekeeping minimum service
>       sched/isolation: Consolidate error handling
>       sched/isolation: Fix housekeeping_mask memory leak
>       sched/isolation: Split housekeeping cpumask per isolation features
> 
> 
>  arch/x86/kernel/cpu/aperfmperf.c |   6 +-
>  arch/x86/kvm/x86.c               |   2 +-
>  drivers/base/cpu.c               |   2 +-
>  drivers/pci/pci-driver.c         |  21 +++--
>  include/linux/sched/isolation.h  |  43 ++++++-----
>  kernel/cgroup/cpuset.c           |   6 +-
>  kernel/cpu.c                     |   4 +-
>  kernel/irq/cpuhotplug.c          |   4 +-
>  kernel/irq/manage.c              |   4 +-
>  kernel/kthread.c                 |   4 +-
>  kernel/rcu/tasks.h               |   2 +-
>  kernel/rcu/tree_plugin.h         |   2 +-
>  kernel/sched/core.c              |  12 +--
>  kernel/sched/fair.c              |  10 +--
>  kernel/sched/isolation.c         | 162 +++++++++++++++++++++++++--------------
>  kernel/sched/topology.c          |   8 +-
>  kernel/watchdog.c                |   2 +-
>  kernel/workqueue.c               |   4 +-
>  net/core/net-sysfs.c             |   6 +-
>  19 files changed, 180 insertions(+), 124 deletions(-)

Thanks for this!

Reviewed-by: Juri Lelli <juri.lelli@...hat.com>

Best,
Juri