linux-kernel - Re: [PATCH] sched: topology: add input parameter for sched_domain_flags

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Message-ID: <20220328115844.GC8939@worktop.programming.kicks-ass.net>
Date:   Mon, 28 Mar 2022 13:58:44 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Qing Wang <wangqing@...o.com>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        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>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched: topology: add input parameter for
 sched_domain_flags_f()

On Mon, Mar 28, 2022 at 02:53:37AM -0700, Qing Wang wrote:
> From: Wang Qing <wangqing@...o.com>
> 
> sched_domain_flags_f() are statically set now, but actually, we can get a
> lot of necessary information based on the cpu_map. e.g. we can know whether
> its cache is shared.
> 
> Allows custom extension without affecting current.

This all still makes absolutely no sense. The architecture builds these
masks, the architecture is in charge of which flags function is called
on which mask.

Passing the mask back in means it lost the plot somewhere and doens't
know wth it's doing anymore.

NAK