linux-kernel - Re: [PATCH 1/5] try parent numa_node at first before using default

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Message-ID: <20070712172310.4d662e1f@gondolin.boeblingen.de.ibm.com>
Date:	Thu, 12 Jul 2007 17:23:10 +0200
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	Yinghai.Lu@....COM, Greg KH <greg@...ah.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>, rientjes@...gle.com,
	Christoph Lameter <clameter@....com>,
	Christoph Hellwig <hch@...radead.org>,
	David Miller <davem@...emloft.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org
Subject: Re: [PATCH 1/5] try parent numa_node at first before using default

On Thu, 12 Jul 2007 13:30:28 +0200,
Stefan Richter <stefanr@...6.in-berlin.de> wrote:

> So, since figuring the correct DMA device out is done by drivers
> themselves, they usually can figure out the correct NUMA node as well.
> The only precondition is that each DMA device has the correct NUMA node
> set.  This is the job of subsystems like PCI, but it may be reasonable
> to have simple and broadly applicable helpers for this in the driver core.
> 
> So, _is_ the dev->numa_node = dev->parent.numa_node assumption, if
> implemented in device_add() and device_move(), as simple and as broadly
> applicable as we want driver core's API to be?  Perhaps yes.

If making the general assumption that the device will inherit the
numa_node through its parent(s) from the responsible DMA device is
reasonable, then device_move() should certainly update the numa_node
from the new parent. (For special cases, the caller could still call
set_dev_node() itself.)
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