linux-kernel - Re: [PATCH] x86_64 irq: reuse vector for __assign_irq

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Message-ID: <20061024090619.GD4943@rhun.haifa.ibm.com>
Date:	Tue, 24 Oct 2006 11:06:19 +0200
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	yhlu <yhlu.kernel@...il.com>
Cc:	Andi Kleen <ak@....de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Adrian Bunk <bunk@...sta.de>
Subject: Re: [PATCH] x86_64 irq: reuse vector for __assign_irq_vector

On Mon, Oct 23, 2006 at 09:15:31PM -0700, yhlu wrote:
> in phys flat mode, when using set_xxx_irq_affinity to irq balance from
> one cpu to another,  _assign_irq_vector will get to increase last used
> vector and get new vector. this will use up the vector if enough
> set_xxx_irq_affintiy are called. and end with using same vector in
> different cpu for different irq. (that is not what we want, we only
> want to use same vector in different cpu for different irq when more
> than 0x240 irq needed). To keep it simple, the vector should be reused
> instead of getting new vector.
> 
> Also according to Eric's review, make it more generic to be used with
> flat mode too.
> 
> This patch need to be applied over Eric's irq: cpu_online_map patch.
> 
> 
> Cc: Eric W. Biederman <ebiederm@...ssion.com>
> Cc: Muli Ben-Yehuda <muli@...ibm.com>
> Signed-off-by: Yinghai Lu <yinghai.lu@....com>

Boots fine and survives a quick stress test.

Cheers,
Muli
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