linux-kernel - Re: [PATCH 3/7] INIT: Limit the number of per cpu INIT bootup messages

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Message-ID: <alpine.DEB.2.00.0911121303261.13943@chino.kir.corp.google.com>
Date:	Thu, 12 Nov 2009 13:06:45 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Mike Travis <travis@....com>
cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Roland Dreier <rdreier@...co.com>,
	Randy Dunlap <rdunlap@...otime.net>, Tejun Heo <tj@...nel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Jack Steiner <steiner@....com>,
	Frederic Weisbecker <fweisbec@...il.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/7] INIT: Limit the number of per cpu INIT bootup
 messages

On Thu, 12 Nov 2009, Mike Travis wrote:

> Limit the number of per cpu INIT messages when system is booting to
> prevent clogging up the console output with repetitious messages.
> 

Needs a better changelog.  What did you do to effect that change?  It 
looks like you're only emitting certain messages from the boot cpu.

> Signed-off-by: Mike Travis <travis@....com>
> ---
>  init/calibrate.c |   22 +++++++++++++---------
>  kernel/cpu.c     |    5 ++---
>  2 files changed, 15 insertions(+), 12 deletions(-)
> 
> --- linux.orig/init/calibrate.c
> +++ linux/init/calibrate.c
> @@ -123,23 +123,26 @@
>  {
>  	unsigned long ticks, loopbit;
>  	int lps_precision = LPS_PREC;
> +	bool boot_cpu = (smp_processor_id() == 0);
>  
>  	if (preset_lpj) {
>  		loops_per_jiffy = preset_lpj;
> -		printk(KERN_INFO
> -			"Calibrating delay loop (skipped) preset value.. ");
> -	} else if ((smp_processor_id() == 0) && lpj_fine) {
> +		if (boot_cpu)
> +			pr_info("Calibrating delay loop (skipped) "
> +				"preset value.. ");

Same comment as before about breaking printk strings into multiple lines 
when not broken at '\n'.  All the other patches your series look good 
after this, however.

> +	} else if ((boot_cpu) && lpj_fine) {

Parentheses around boot_cpu?

>  		loops_per_jiffy = lpj_fine;
> -		printk(KERN_INFO
> -			"Calibrating delay loop (skipped), "
> +		pr_info("Calibrating delay loop (skipped), "
>  			"value calculated using timer frequency.. ");
>  	} else if ((loops_per_jiffy = calibrate_delay_direct()) != 0) {
> -		printk(KERN_INFO
> -			"Calibrating delay using timer specific routine.. ");
> +		if (boot_cpu)
> +			pr_info("Calibrating delay using timer "
> +				"specific routine.. ");
>  	} else {
>  		loops_per_jiffy = (1<<12);
>  
> -		printk(KERN_INFO "Calibrating delay loop... ");
> +		if (boot_cpu)
> +			pr_info("Calibrating delay loop... ");
>  		while ((loops_per_jiffy <<= 1) != 0) {
>  			/* wait for "start of" clock tick */
>  			ticks = jiffies;
> @@ -170,7 +173,8 @@
>  				loops_per_jiffy &= ~loopbit;
>  		}
>  	}
> -	printk(KERN_CONT "%lu.%02lu BogoMIPS (lpj=%lu)\n",
> +	if (boot_cpu)
> +		pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
>  			loops_per_jiffy/(500000/HZ),
>  			(loops_per_jiffy/(5000/HZ)) % 100, loops_per_jiffy);
>  }
> --- linux.orig/kernel/cpu.c
> +++ linux/kernel/cpu.c
> @@ -392,10 +392,9 @@
>  		if (cpu == first_cpu)
>  			continue;
>  		error = _cpu_down(cpu, 1);
> -		if (!error) {
> +		if (!error)
>  			cpumask_set_cpu(cpu, frozen_cpus);
> -			printk("CPU%d is down\n", cpu);
> -		} else {
> +		else {
>  			printk(KERN_ERR "Error taking CPU%d down: %d\n",
>  				cpu, error);
>  			break;
--
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