netdev - Re: [PATCH v4 5/7] sched/topology: Introduce sched_numa_hop

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Message-ID: <YzNPTwVKb7ssrH01@yury-laptop>
Date:   Tue, 27 Sep 2022 12:30:23 -0700
From:   Yury Norov <yury.norov@...il.com>
To:     Valentin Schneider <vschneid@...hat.com>
Cc:     netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mel Gorman <mgorman@...e.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Tony Luck <tony.luck@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Gal Pressman <gal@...dia.com>,
        Tariq Toukan <tariqt@...dia.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>
Subject: Re: [PATCH v4 5/7] sched/topology: Introduce sched_numa_hop_mask()

On Tue, Sep 27, 2022 at 05:45:10PM +0100, Valentin Schneider wrote:
> On 25/09/22 08:00, Yury Norov wrote:
> > On Fri, Sep 23, 2022 at 04:55:40PM +0100, Valentin Schneider wrote:
> >> +/**
> >> + * sched_numa_hop_mask() - Get the cpumask of CPUs at most @hops hops away.
> >> + * @node: The node to count hops from.
> >> + * @hops: Include CPUs up to that many hops away. 0 means local node.
> >> + *
> >> + * Requires rcu_lock to be held. Returned cpumask is only valid within that
> >> + * read-side section, copy it if required beyond that.
> >> + *
> >> + * Note that not all hops are equal in distance; see sched_init_numa() for how
> >> + * distances and masks are handled.
> >> + *
> >> + * Also note that this is a reflection of sched_domains_numa_masks, which may change
> >> + * during the lifetime of the system (offline nodes are taken out of the masks).
> >> + */
> >
> > Since it's exported, can you declare function parameters and return
> > values properly?
> >
> 
> I'll add a bit about the return value; what is missing for the parameters?

My bad, scratch this.