linux-kernel - Re: [PATCH v4 1/2] nohz: add tick_nohz_full_cpumask_or() and

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Message-ID: <20150409174218.GT21418@twins.programming.kicks-ass.net>
Date:	Thu, 9 Apr 2015 19:42:18 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Chris Metcalf <cmetcalf@...hip.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/2] nohz: add tick_nohz_full_cpumask_or() and
 _andnot() APIs

On Thu, Apr 09, 2015 at 01:24:22PM -0400, Chris Metcalf wrote:
> However, I'd still appreciate guidance on the naming, since I do
> have a patch outstanding to fiddle with cpumasks for nohz_full
> (in the other case, for the tilegx network driver irq mask).
> 
> So here's the obvious readable code snippet approach:
> 
> #ifdef CONFIG_NO_HZ_FULL
>         cpumask_or(some_random_map, some_random_map, tick_nohz_full_map);
> #endif
> 
> Some possible names so we can macroize them to no-ops:
> 
>         exclude_nohz_full_cpus_from(some_random_map);
> or
>         remove_nohz_full_cpus_from(some_random_map);
> 
>         include_nohz_full_cpus_in(some_random_map);
> or
>         add_nohz_full_cpus_to(some_random_map);
> 
> or perhaps with better namespace prefixes, but more confusing to read:
> 
>         tick_nohz_full_exclude_cpus_from(some_random_map);
> or
>         tick_nohz_full_remove_cpus_from(some_random_map);
> 
>         tick_nohz_full_include_cpus_in(some_random_map);
> or
>         tick_nohz_full_add_cpus_to(some_random_map);
> 
> Any of these sound good? Any other ideas?

Yes, I think these are all clearer than previous attempts.

I'm not entirely sure which to pick though; I have a vague preference
for add/remove over include/exclude and the top set reads better then
the lower set but the lower set is more consistent in naming :/

But the important point is that these names all indicate you're going to
change the mask passed as argument.
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