linux-kernel - Re: [PATCH 4/8] SGI x86_64 UV: Limit the number of ACPI messages

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Date:	Tue, 27 Oct 2009 09:51:15 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Mike Travis <travis@....com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jack Steiner <steiner@....com>,
	Zhang Rui <rui.zhang@...el.com>, Len Brown <lenb@...nel.org>,
	Thomas Renninger <trenn@...e.de>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Myron Stowe <myron.stowe@...com>,
	Feng Tang <feng.tang@...el.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Yinghai Lu <yhlu.kernel@...il.com>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/8] SGI x86_64 UV: Limit the number of ACPI messages

On Tuesday 27 October 2009 09:27:35 am Mike Travis wrote:
> Bjorn Helgaas wrote:
> ...
> > 
> > I know we print way too much stuff for every processor, but again, I'd
> > rather see all CPUs or none.  I think there's a little more value in
> > this one than the cooling device one (probably because I do a lot of
> > platform bringup), but it could certainly be made KERN_DEBUG and/or
> > combined with another processor discovery line.
> 
> Is this more acceptable?
> 
> Thanks,
> Mike
> --- 
> 
> SGI x86_64 UV: Limit the number of ACPI messages
> 
> Limit number of ACPI messages of the form:
> 
> [    0.000000] ACPI: LSAPIC (acpi_id[0x00] lsapic_id[0x00] lsapic_eid[0x00] enabled)
> 
> [   99.638655] processor ACPI0007:00: registered as cooling_device0
> 
> Cc: Zhang Rui <rui.zhang@...el.com>
> Cc: Len Brown <lenb@...nel.org>
> Cc: Thomas Renninger <trenn@...e.de>
> Cc: Bjorn Helgaas <bjorn.helgaas@...com>
> Cc: Alexey Dobriyan <adobriyan@...il.com>
> Cc: Myron Stowe <myron.stowe@...com>
> Cc: Feng Tang <feng.tang@...el.com>
> Cc: Suresh Siddha <suresh.b.siddha@...el.com>
> Cc: Yinghai Lu <yhlu.kernel@...il.com>
> Cc: linux-acpi@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Mike Travis <travis@....com>
> ---
>  drivers/acpi/fan.c            |    2 +-
>  drivers/acpi/processor_core.c |    3 +--
>  drivers/acpi/tables.c         |   13 ++++++++-----
>  3 files changed, 10 insertions(+), 8 deletions(-)
> 
> --- linux.orig/drivers/acpi/fan.c
> +++ linux/drivers/acpi/fan.c
> @@ -267,7 +267,7 @@
>  		goto end;
>  	}
>  
> -	dev_info(&device->dev, "registered as cooling_device%d\n", cdev->id);
> +	dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id);
>  
>  	device->driver_data = cdev;
>  	result = sysfs_create_link(&device->dev.kobj,
> --- linux.orig/drivers/acpi/processor_core.c
> +++ linux/drivers/acpi/processor_core.c
> @@ -845,8 +845,7 @@
>  		goto err_power_exit;
>  	}
>  
> -	dev_info(&device->dev, "registered as cooling_device%d\n",
> -		 pr->cdev->id);
> +	dev_dbg(&device->dev, "registered as cooling_device%d\n", pr->cdev->id);

I still think you should just remove these messages completely.

If you do keep them, note that dev_dbg() is not the same as
dev_prinkt(KERN_DEBUG) -- dev_dbg() compiles to nothing at all
unless "DEBUG" is defined.

>  	result = sysfs_create_link(&device->dev.kobj,
>  				   &pr->cdev->device.kobj,
> --- linux.orig/drivers/acpi/tables.c
> +++ linux/drivers/acpi/tables.c
> @@ -170,11 +170,14 @@
>  	case ACPI_MADT_TYPE_LOCAL_SAPIC:
>  		{
>  			struct acpi_madt_local_sapic *p =
> -			    (struct acpi_madt_local_sapic *)header;
> -			printk(KERN_INFO PREFIX
> -			       "LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
> -			       p->processor_id, p->id, p->eid,
> -			       (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
> +				(struct acpi_madt_local_sapic *)header;
> +
> +			printk(KERN_DEBUG PREFIX
> +				"LSAPIC (acpi_id[0x%02x] "
> +				"lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
> +				p->processor_id, p->id, p->eid,
> +				(p->lapic_flags & ACPI_MADT_ENABLED) ?
> +					"enabled" : "disabled");

I don't object to this.

I do think it'd be much better to combine this with the other
per-processor startup messages, of which we have an absolute over-
abundance:

	CPU0: Intel(R) Xeon(TM) CPU 2.80GHz stepping 09
	Booting processor 1 APIC 0x6 ip 0x6000
	Initializing CPU#1
	Calibrating delay using timer specific routine.. 5597.14 BogoMIPS (lpj=2798571)
	CPU: Trace cache: 12K uops, L1 D cache: 8K
	CPU: L2 cache: 512K
	CPU: Physical Processor ID: 3
	CPU: Processor Core ID: 0

But that's a bigger project.

Bjorn
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