linux-kernel - Re: [PATCH 2 2/3] sched: Fix the wakeup nomination for sched_mc/smt_power

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 3 Mar 2009 14:59:07 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Gautham R Shenoy <ego@...ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Balbir Singh <balbir@...ibm.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Dipankar Sarma <dipankar@...ibm.com>, efault@....de,
	andi@...stfloor.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2 2/3] sched: Fix the wakeup nomination for
	sched_mc/smt_power_savings.


* Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> On Tue, 2009-03-03 at 17:21 +0530, Gautham R Shenoy wrote:
> > +/* Assign the sched-domain level which can nominate preferred wake-up cpu */
> > +       rd->sched_mc_preferred_wakeup_cpu = UINT_MAX;
> > +       rd->authorized_nomination_level = SD_LV_NONE;
> > +
> > +       if (active_power_savings_level >= POWERSAVINGS_BALANCE_WAKEUP) {
> > +               struct sched_domain *sd;
> > +               enum sched_domain_level authorized_nomination_level =
> > +                                                               SD_LV_NONE;
> > +
> > +               for_each_domain(first_cpu(*cpu_map), sd) {
> > +                       if (!(sd->flags & SD_POWERSAVINGS_BALANCE))
> > +                               continue;
> > +                       authorized_nomination_level = sd->level;
> > +               }
> > +
> > +               rd->authorized_nomination_level = authorized_nomination_level;
> > +       }
> 
> Very odd looking comments there, and that enum init wrapping looks
> weird. Either exceed 80 chars, or write it in a second line like:
> 
>  enum sched_domain_level authorized_nomination_level;
> 
>  authorized_nomination_level = SD_LV_NONE;

I think find_busiest_group() needs to be split up into several 
helper functions first, before we add more to it. I.e. first a 
couple of cleanup patches that factor it out into 3-4 helper 
functions plus a really easy-to-read find_busiest_group() main 
function.

Then can we do the above change - and i bet we'll win at least 
one indentation level as well so that weird line break goes 
away.

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/