linux-kernel - Re: [PATCH 00/16] dyn_array and nr

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Message-ID: <m1abfwnym4.fsf@frodo.ebiederm.org>
Date:	Fri, 01 Aug 2008 15:45:23 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>, hpa <hpa@...or.com>,
	"Dhaval Giani" <dhaval@...ux.vnet.ibm.com>,
	"Mike Travis" <travis@....com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/16] dyn_array and nr_irqs support v2

"Yinghai Lu" <yhlu.kernel@...il.com> writes:

> On Fri, Aug 1, 2008 at 2:30 PM, Yinghai Lu <yhlu.kernel@...il.com> wrote:
>> On Fri, Aug 1, 2008 at 1:46 PM, Eric W. Biederman <ebiederm@...ssion.com>
> wrote:
>
>>> http://lkml.org/lkml/2008/7/10/439
>
> you moved kstat_irqs to irqdesc, and it will not numa-aware. if
> irq_desc is not go with every cpu.

That part is a limitation of the per cpu allocator that the sgi guys
are in the process of fixing.  Which is one of the following goals
of folding the pda into a per cpu structure.

In practice it matters little as irqs only occur on one cpu at a time,
so we shouldn't have cache line contention.

I never got to the arch specific part of allocating irq_desc in a numa
aware fashion.  But I have always figured that if we move the work to
arch code it won't be too difficult, to do things appropriately.

Eric
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