linux-kernel - Re: [tip:sched/urgent] sched: Print sched_group::__cpu_power in sched_domain

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Message-ID: <20090414000934.GN817@elte.hu>
Date:	Tue, 14 Apr 2009 02:09:34 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Tony Luck <tony.luck@...el.com>
Cc:	mingo@...hat.com, hpa@...or.com, ego@...ibm.com,
	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	tglx@...utronix.de, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/urgent] sched: Print sched_group::__cpu_power in
	sched_domain_debug


* Tony Luck <tony.luck@...el.com> wrote:

> > --- a/kernel/sched.c
> > +++ b/kernel/sched.c
> > @@ -6963,7 +6963,8 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
> >                cpumask_or(groupmask, groupmask, sched_group_cpus(group));
> >
> >                cpulist_scnprintf(str, sizeof(str), sched_group_cpus(group));
> > -               printk(KERN_CONT " %s", str);
> > +               printk(KERN_CONT " %s (__cpu_power = %d)", str,
> > +                                               group->__cpu_power);
> 
> This has added a lot of clutter to the console log during boot
> (especially on large systems).
> 
> Here is the start of the diff output comparing old and new console
> messages on a 16 cpu machine:
> 
> 77c77
> <   groups: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
> ---
> >   groups: 0 (__cpu_power = 1024) 1 (__cpu_power = 1024) 2 (__cpu_power = 1024) 3 (__cpu_power = 1024) 4 (__cpu_power = 1024) 5 (__cpu_power = 1024) 6 (__cpu_power = 1024) 7 (__cpu_power = 1024) 8 (
> __cpu_power = 1024) 9 (__cpu_power = 1024) 10 (__cpu_power = 1024) 11
> (__cpu_power = 1024) 12 (__cpu_power = 1024) 13 (__cpu_power = 1024)
> 14 (__cpu_power = 1024) 15 (__cpu_power = 1024)
> 80c80

indeed ...

I think we should skip the printout in the default (power==1024) 
case. Gautham?

	Ingo
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