linux-kernel - Re: [Patch Part3 v4 37/38] x86, irq: Introduce mechanism to support different vector allocation policies

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Message-ID: <alpine.DEB.2.11.1411271142340.3961@nanos>
Date:	Thu, 27 Nov 2014 11:44:50 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Randy Dunlap <rdunlap@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Borislav Petkov <bp@...en8.de>, x86@...nel.org,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>,
	Joerg Roedel <joro@...tes.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, Daniel J Blueman <daniel@...ascale.com>
Subject: Re: [Patch Part3 v4 37/38] x86, irq: Introduce mechanism to support
 different vector allocation policies

On Tue, 25 Nov 2014, Jiang Liu wrote:
> Introduce mechanism to support different vector allocation policies,
> so platform or user may choose the best suitable CPU vector allocation

I've postponed this and the next patch for 3.20.

> policy. Currently two policies are supported:
> 1) allocate CPU vector from cpumask_of_node(dev_to_node(dev))
> 2) allocate from apic->target_cpus(), this is the default policy
> 
> Platform driver may call set_vector_alloc_policy() to choose the
> preferred policies.
> 
> This mechanism may be used to support NumaConnect systems to allocate
> CPU vectors from device local node.

So these policies are system wide and need to be selected at boot time?

Thanks,

	tglx

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