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Date:   Tue, 27 Sep 2022 15:48:19 +0000
From:   Joel Fernandes <joel@joelfernandes.org>
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     Ricardo Neri <ricardo.neri-calderon@linux.intel.com>,
        Juri Lelli <juri.lelli@redhat.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Ricardo Neri <ricardo.neri@intel.com>,
        "Ravi V. Shankar" <ravi.v.shankar@intel.com>,
        Ben Segall <bsegall@google.com>,
        Daniel Bristot de Oliveira <bristot@redhat.com>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Len Brown <len.brown@intel.com>, Mel Gorman <mgorman@suse.de>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        Valentin Schneider <vschneid@redhat.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org, "Tim C . Chen" <tim.c.chen@intel.com>
Subject: Re: [RFC PATCH 03/23] sched/core: Initialize the class of a new task
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References: <20220909231205.14009-1-ricardo.neri-calderon@linux.intel.com>
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On Tue, Sep 27, 2022 at 03:04:39PM +0200, Peter Zijlstra wrote:
> On Mon, Sep 26, 2022 at 02:57:29PM +0000, Joel Fernandes wrote:
> 
> > > +#ifdef CONFIG_SCHED_TASK_CLASSES
> > > +	p->class			= TASK_CLASS_UNCLASSIFIED;
> > > +#endif
> > 
> > I find the term 'class' very broad and unclear what kind of class (without
> > further reading). So I am worried about how this generic term usage plays
> > with Linux source code in the long-term (like what if someone else comes up
> > with a usage of term 'class' that is unrelated to IPC.)
> 
> However much I like making a pain for people using C++ to compile the
> kernel, I do think ipcc might be better here
> (instructions_per_cycle_class for those of the novel per identifier
> school of thought).

Yes, ipcc sounds fine to me.

> > To that end, I was wondering if it could be renamed to p->ipc_class, and
> > CONFIG_SCHED_TASK_IPC_CLASSES, or something.
> 
> Can we *please* shorten those thing instead of writing a novel?
> CONFIG_SCHED_IPC_CLASS works just as well, no? Or TASK_IPC, whatever.

CONFIG_SCHED_IPC_CLASS also sounds fine, or:

CONFIG_SCHED_IPC_CLASS_SHORTENED_VERSION_TO_NOT_ANNOY_PETER.


thanks,

 - Joel