linux-kernel - Re: [PATCH 1/1] SGI X86 UV: Provide a System Activity Indicator driver

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Date:	Mon, 22 Sep 2008 07:47:37 -0700
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Andrew Morton <akpm@...ux-foundation.org>, rpurdie@...ys.net,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 1/1] SGI X86 UV: Provide a System Activity Indicator	driver

Ingo Molnar wrote:
> * Mike Travis <travis@....com> wrote:
> 
>>  arch/x86/kernel/genx2apic_uv_x.c |  138 +++++++++++++++++++++++++++++++++++++++
>>  include/asm-x86/uv/uv_hub.h      |   62 +++++++++++++++++
> 
> hm, why is this in genx2apic_uv_x.c, not a separate file?

This keeps it in the uv_hub percpu area, a chunk of memory that is accessed
quite often for many of the basic UV operations.  This should increase the
probability that the data is already located in the cpu's cache.

Thanks,
Mike

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