linux-kernel - Re: [RFC Patch V1 15/30] mm, igb: Use cpu_to_mem()/numa_mem

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Message-ID: <20140721210900.GI4156@linux.vnet.ibm.com>
Date:	Mon, 21 Jul 2014 14:09:00 -0700
From:	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>
To:	Alexander Duyck <alexander.duyck@...il.com>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	Greg Rose <gregory.v.rose@...el.com>,
	Alex Duyck <alexander.h.duyck@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	Mitch Williams <mitch.a.williams@...el.com>,
	Linux NICS <linux.nics@...el.com>,
	Tony Luck <tony.luck@...el.com>, linux-mm@...ck.org,
	linux-hotplug@...r.kernel.org, linux-kernel@...r.kernel.org,
	e1000-devel@...ts.sourceforge.net, Netdev <netdev@...r.kernel.org>
Subject: Re: [RFC Patch V1 15/30] mm, igb: Use cpu_to_mem()/numa_mem_id() to
 support memoryless node

On 21.07.2014 [12:53:33 -0700], Alexander Duyck wrote:
> I do agree the description should probably be changed.  There shouldn't be
> any panics involved, only a performance impact as it will be reallocating
> always if it is on a node with no memory.

Yep, thanks for the review.

> My intention on this was to make certain that the memory used is from the
> closest node possible.  As such I believe this change likely honours that.

Absolutely, just wanted to make it explicit that it's not a functional
fix, just a performance fix (presuming this shows up at all on systems
that have memoryless NUMA nodes).

I'd suggest an update to the comments, as well.

Thanks,
Nish

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