linux-kernel - Re: [PATCH 1 of 6] hotplug-memory: refactor online_pages to separate zone growth from page onlining

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Date:	Thu, 03 Apr 2008 18:09:31 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Yasunori Goto <y-goto@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Lameter <clameter@....com>
Subject: Re: [PATCH 1 of 6] hotplug-memory: refactor online_pages to
	separate zone growth from page onlining


On Thu, 2008-04-03 at 17:05 -0700, Jeremy Fitzhardinge wrote:
> 
> +int prepare_online_pages(unsigned long pfn, unsigned long nr_pages)
> +{
> +       int ret = notify_going_online(pfn, nr_pages);
> +       if (ret)
> +               return ret;
> +
> +       grow_zone_span(pfn, pfn+nr_pages);
>         return 0;
> +}

OK, after seeing this used in the Xen driver, I'm even less a fan of the
name.  Mostly because it doesn't actually prepare *pages* to be onlined.
It prepares the zones/pgdats and notifies that pages might soon be
online.  Can you think of any better names?

grow_and_notify...??

It's also a bit funky because you're calling the online notifiers, but
you're not actually onlining the pages, yet.  Does that have any
repercussions?

-- Dave

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