linux-kernel - Re: [PATCH] VMware Balloon driver

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Message-ID: <4BBB890E.5040808@goop.org>
Date:	Tue, 06 Apr 2010 12:18:38 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Avi Kivity <avi@...hat.com>
CC:	Dmitry Torokhov <dtor@...are.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"pv-drivers@...are.com" <pv-drivers@...are.com>
Subject: Re: [PATCH] VMware Balloon driver

On 04/06/2010 11:36 AM, Avi Kivity wrote:
> On 04/06/2010 09:25 PM, Jeremy Fitzhardinge wrote:
>> On 04/06/2010 09:32 AM, Avi Kivity wrote:
>>> Yeah.  If we wanted commonality, we could make a balloon_core.c that 
>>> contains the common code.  IMO that's premature, but perhaps there's 
>>> some meat there (like suspend/resume support and /proc//sys interface).
>>
>> I think it would be useful to have common:
>>
>>   1. User and kernel mode ABIs for controlling ballooning.  It assumes
>>      that the different balloon implementations are sufficiently
>>      similar in semantics.   (Once there's a kernel ABI, adding a
>>      common user ABI is trivial.)
>>   2. Policy driving the ballooning driver, at least from the guest
>>      side.  That is, some good metrics from the vm subsystem about
>>      memory pressure (both positive and negative), and something to
>>      turn those metrics into requests to the balloon driver.
>>
>> 1) is not a huge amount of code, but something consistent would be 
>> nice.  2) is something we've been missing and is a bit of an open 
>> question/research project anyway.
>
> 3) Code that attempts to reclaim 2MB pages when possible

Yes.  Ballooning in 4k units is a bit silly.

     J

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