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Date: Thu, 14 Nov 2013 16:20:17 +0530 From: Srikar Dronamraju <srikar@...ux.vnet.ibm.com> To: Peter Zijlstra <peterz@...radead.org> Cc: mingo@...nel.org, hpa@...or.com, linux-kernel@...r.kernel.org, tglx@...utronix.de, mikey@...ling.org, linux-tip-commits@...r.kernel.org Subject: Re: [PATCH v2] sched: Check sched_domain before computing group power. > + /* > + * build_sched_domains() -> init_sched_groups_power() > + * gets here before we've attached the domains to the > + * runqueues. > + * > + * Use power_of(), which is set irrespective of domains > + * in update_cpu_power(). > + * > + * This avoids power/power_orig from being 0 and > + * causing divide-by-zero issues on boot. > + * > + * Runtime updates will correct power_orig. > + */ > + if (!rq->sd) { Because this condition is only true during boot up, I am now thinking if we should do mark this as unlikely i.e if (unlikely(!rq->sd)) { Peter, Please do let me know if you agree and if you want to spin of a new version? > + power_orig += power_of(cpu); > + power += power_of(cpu); > + continue; > + } > + > + sgp = rq->sd->groups->sgp; > + power_orig += sgp->power_orig; > + power += sgp->power; > } > } else { > /* > -- Thanks and Regards Srikar Dronamraju -- 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/
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