linux-kernel - Re: [PATCH 2/4] sched: compute runnable load avg in cpu_load and cpu_avg_load_per

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <20130124100823.GE26351@gmail.com>
Date:	Thu, 24 Jan 2013 11:08:23 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Alex Shi <alex.shi@...el.com>
Cc:	mingo@...hat.com, peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, arjan@...ux.intel.com, bp@...en8.de,
	pjt@...gle.com, namhyung@...nel.org, efault@....de,
	vincent.guittot@...aro.org, gregkh@...uxfoundation.org,
	preeti@...ux.vnet.ibm.com, viresh.kumar@...aro.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] sched: compute runnable load avg in cpu_load and
 cpu_avg_load_per_task


* Alex Shi <alex.shi@...el.com> wrote:

> @@ -2539,7 +2539,11 @@ static void __update_cpu_load(struct rq *this_rq, unsigned long this_load,
>  void update_idle_cpu_load(struct rq *this_rq)
>  {
>  	unsigned long curr_jiffies = ACCESS_ONCE(jiffies);
> +#if defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED)
> +	unsigned long load = (unsigned long)this_rq->cfs.runnable_load_avg;
> +#else
>  	unsigned long load = this_rq->load.weight;
> +#endif

I'd not make it conditional - just calculate runnable_load_avg 
all the time (even if group scheduling is disabled) and use it 
consistently. The last thing we want is to bifurcate scheduler 
balancer behavior even further.

Thanks,

	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/