linux-kernel - Re: [PATCH v2] memory-hotplug: add sysfs zones_online

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Date:	Fri, 22 Aug 2014 15:21:58 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Zhang Zhen <zhenzhang.zhang@...wei.com>
CC:	Toshi Kani <toshi.kani@...com>,
	David Rientjes <rientjes@...gle.com>,
	isimatu.yasuaki@...fujitsu.com, n-horiguchi@...jp.nec.com,
	wangnan0@...wei.com, linux-kernel@...r.kernel.org,
	Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH v2] memory-hotplug: add sysfs zones_online_to attribute

On 08/22/2014 03:16 PM, Andrew Morton wrote:
> Also, it's not really clear to me why we need this sysfs file at all. 
> Do people really read sysfs files, make onlining decisions and manually
> type in commands?  Or is this stuff all automated?  If the latter then
> the script can take care of all this?  For example, attempt to online
> the memory into the desired zone and report failure if that didn't
> succeed?

I guess we can just iterate over all possible zone types from userspace
until we find one.  Seems a bit hokey, but it would work at least until
we add a new zone type and we have to teach the scripts about the new
type.  But that's a pretty rare event I guess.  Let's hope the script
writers get this right, and don't make omissions like ZONE_MOVABLE
because it's not that common in practice.
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