linux-kernel - Re: [patch 3/3] x86,apic: limit apic dumping, introduce show

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Date:	Wed, 14 Oct 2009 09:12:17 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	x86@...nel.org, yinghai@...nel.org, macro@...ux-mips.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 3/3] x86,apic: limit apic dumping, introduce show_lapic
	setup option


* Cyrill Gorcunov <gorcunov@...nvz.org> wrote:

> In case if a system has a large number of cpus printing apics
> contents may consume a long time period.
> 
> We limit such an output by 1 apic by default. But to have an
> ability to see all apics or some part of them we introduce
> "show_lapic" setup option which allow us to limit/unlimit
> the number of APICs being dumped.
> 
> Example: apic=debug show_lapic=5, or apic=debug show_lapic=all
> 
> Also move apic_verbosity checking upper that way so helper routines
> do not need to inspect it at all.
> 
> Suggested-by: Yinghai Lu <yinghai@...nel.org>
> Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
> ---
>  arch/x86/kernel/apic/io_apic.c |   47 +++++++++++++++++++++++++++--------------
>  1 file changed, 32 insertions(+), 15 deletions(-)

> +__setup("show_lapic=", setup_show_lapic);

Note: new __setup() functions need an entry in 
Documentation/kernel-parameters.txt as well.

	Ingo
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