linux-kernel - Re: [Xen-devel] [PATCH R3 0/7] xen/balloon: Memory hotplug support for Xen balloon driver

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Date:	Fri, 4 Feb 2011 09:11:22 +0000
From:	Ian Campbell <Ian.Campbell@...citrix.com>
To:	"v.tolstov@...fip.ru" <v.tolstov@...fip.ru>
CC:	Daniel Kiper <dkiper@...-space.pl>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"andi.kleen@...el.com" <andi.kleen@...el.com>,
	"haicheng.li@...ux.intel.com" <haicheng.li@...ux.intel.com>,
	"fengguang.wu@...el.com" <fengguang.wu@...el.com>,
	"jeremy@...p.org" <jeremy@...p.org>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"Dan Magenheimer" <dan.magenheimer@...cle.com>,
	"pasik@....fi" <pasik@....fi>,
	"dave@...ux.vnet.ibm.com" <dave@...ux.vnet.ibm.com>,
	"wdauchy@...il.com" <wdauchy@...il.com>,
	"rientjes@...gle.com" <rientjes@...gle.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [Xen-devel] [PATCH R3 0/7] xen/balloon: Memory hotplug support
 for Xen balloon driver

On Thu, 2011-02-03 at 21:20 +0000, Vasiliy G Tolstov wrote:
> I have some may be offtopic question: Is that possible to export balloon
> function balloon_set_new_target to GPL modules (EXPORT_SYMBOL_GPL) ? 
> This helps to kernel modules (not in kernel tree) to contol balloonin
> (for example autoballoon or something else) without needing to write so
> sysfs. (Writing files from kernel module is bad, this says Linux Kernel
> Faq).

Is there a reason to do it from kernel space in the first place? auto
ballooning can be done by a userspace daemon, can't it?

Ian.

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