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Message-ID: <20221129115439.GA1715045@lothringen>
Date: Tue, 29 Nov 2022 12:54:39 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: Leonardo Bras <leobras@...hat.com>
Cc: Steffen Klassert <steffen.klassert@...unet.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
"David S. Miller" <davem@...emloft.net>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Juri Lelli <juri.lelli@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Steven Rostedt <rostedt@...dmis.org>,
Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
Daniel Bristot de Oliveira <bristot@...hat.com>,
Valentin Schneider <vschneid@...hat.com>,
Tejun Heo <tj@...nel.org>,
Lai Jiangshan <jiangshanlai@...il.com>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Phil Auld <pauld@...hat.com>,
Antoine Tenart <atenart@...nel.org>,
Christophe JAILLET <christophe.jaillet@...adoo.fr>,
Wang Yufen <wangyufen@...wei.com>, mtosatti@...hat.com,
linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-pci@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2 2/4] sched/isolation: Improve documentation
On Thu, Oct 13, 2022 at 03:40:27PM -0300, Leonardo Bras wrote:
> Improve documentation on housekeeping types and what to expect from
> housekeeping functions.
>
> Signed-off-by: Leonardo Bras <leobras@...hat.com>
> ---
> include/linux/sched/isolation.h | 25 ++++++++++++++++---------
> 1 file changed, 16 insertions(+), 9 deletions(-)
>
> diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h
> index 762701f295d1c..9333c28153a7a 100644
> --- a/include/linux/sched/isolation.h
> +++ b/include/linux/sched/isolation.h
> @@ -7,18 +7,25 @@
> #include <linux/tick.h>
>
> enum hk_type {
> - HK_TYPE_TIMER,
> - HK_TYPE_RCU,
> - HK_TYPE_MISC,
> - HK_TYPE_SCHED,
> - HK_TYPE_TICK,
> - HK_TYPE_DOMAIN,
> - HK_TYPE_WQ,
> - HK_TYPE_MANAGED_IRQ,
> - HK_TYPE_KTHREAD,
> + HK_TYPE_TIMER, /* Timer interrupt, watchdogs */
More precisely:
/* Unbound timer callbacks */
> + HK_TYPE_RCU, /* RCU callbacks */
More generally, because it's more than just about callbacks:
/* Unbound RCU work */
> + HK_TYPE_MISC, /* Minor housekeeping categories */
> + HK_TYPE_SCHED, /* Scheduling and idle load balancing */
> + HK_TYPE_TICK, /* See isolcpus=nohz boot parameter */
Yes or nohz_full=
> + HK_TYPE_DOMAIN, /* See isolcpus=domain boot parameter*/
> + HK_TYPE_WQ, /* Work Queues*/
/* Unbound workqueues */
> + HK_TYPE_MANAGED_IRQ, /* See isolcpus=managed_irq boot parameter */
> + HK_TYPE_KTHREAD, /* kernel threads */
/* Unbound kernel threads */
> HK_TYPE_MAX
> };
>
> +/* Kernel parameters like nohz_full and isolcpus allow passing cpu numbers
> + * for disabling housekeeping types.
> + *
> + * The functions bellow work the opposite way, by referencing which cpus
> + * are able to perform the housekeeping type in parameter.
> + */
*below
Thanks!
> +
> #ifdef CONFIG_CPU_ISOLATION
> DECLARE_STATIC_KEY_FALSE(housekeeping_overridden);
> int housekeeping_any_cpu(enum hk_type type);
> --
> 2.38.0
>
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