linux-kernel - Re: [RFC 0/4] dynamically allocate arch specific system vectors

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Message-ID: <20080914153522.GJ29290@elte.hu>
Date:	Sun, 14 Sep 2008 17:35:22 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Dean Nelson <dcn@....com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alan Mayer <ajm@....com>, jeremy@...p.org,
	rusty@...tcorp.com.au, suresh.b.siddha@...el.com,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yinghai Lu <Yinghai.lu@....com>
Subject: Re: [RFC 0/4] dynamically allocate arch specific system vectors


* Dean Nelson <dcn@....com> wrote:

> On Mon, Aug 11, 2008 at 12:39:22PM -0700, Eric W. Biederman wrote:
> >
> > Although I am not at all convinced that dynamic allocation of
> > the vector number (instead of statically reserving it makes sense).
> 
> We (SGI) need somewhere around eight vectors.
> 
> There are two kernel modules, sgi-gru and sgi-xp (in drivers/misc), 
> that each need two vectors. And there's the broadcast assist unit 
> (BAU) that is involved in tlb shootdown on uv, which currently uses 
> statically reserved vector 0xf8 (UV_BAU_MESSAGE -- see uv_bau_init()). 

while i understand the UV_BAU_MESSAGE case (TLB flushes are special), 
why does sgi-gru and sgi-xp need to go that deep? They are drivers, they 
should be able to make use of an ordinary irq just like the other 2000 
drivers we have do.

> I know of a debugger that also uses 0xf8 because it was previously 
> available until UV_BAU_MESSAGE came along. The BAU would be happy with 
> a dynamically allocated system vector. We have a couple of other 
> things in the works that also need vectors.

which debugger is this?

	Ingo
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