linux-kernel - Re: [PATCH 2/2] x86: implement multiple queues for smp function call IPIs

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Message-ID: <488FAB3F.6050003@goop.org>
Date:	Tue, 29 Jul 2008 16:43:59 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Nick Piggin <nickpiggin@...oo.com.au>,
	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] x86: implement multiple queues for smp function call
 IPIs

Jeremy Fitzhardinge wrote:
> This adds 8 queues for smp_call_function(), in order to avoid a
> bottleneck on a single global lock and list for function calls.  When
> initiating a function call, the sender chooses a queue based on its
> own processor id (if there are more than 8 processors, they hash down
> to 8 queues).  It then sends an IPI to the corresponding vector for
> that queue to each target CPU.  The target CPUs use the vector number
> to determine which queue they should scan for work.

I should point out that this patch depends on the earlier tlb.c 
unification patch, since it recycles the IPI vectors that series freed up.

    J
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