linux-kernel - Re: [RFC] killing the NR

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Message-ID: <45D5F2EC.5000402@goop.org>
Date:	Fri, 16 Feb 2007 10:07:40 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [RFC] killing the NR_IRQS arrays.

Eric W. Biederman wrote:
> So I propose we remove all assumptions from the code that we actually
> have an array of irqs.  That will allow for irq_desc to be dynamically
> allocated instead of statically allocated saving memory and reducing
> kernel complexity.
>   

Sounds good to me.  In Xen we have 1024 event channels which we need to
map down into a smaller irq.  Aside from the complexity of maintaining a
mapping table, that's not a huge issue for now, but when we start
exposing pci devices to guests it all becomes more complex.  The ideal
for us is to simply use event channel == irq, which this would allow.

    J
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