linux-kernel - Re: virtio: Add memory statistics reporting to the balloon driver (V4)

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Message-ID: <4B152EA4.7080207@redhat.com>
Date:	Tue, 01 Dec 2009 16:56:36 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Adam Litke <agl@...ibm.com>
CC:	Rusty Russell <rusty@...tcorp.com.au>,
	Anthony Liguori <anthony@...emonkey.ws>,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: virtio: Add memory statistics reporting to the balloon driver
 (V4)

On 11/30/2009 06:14 PM, Adam Litke wrote:
> Changes since V3:
>   - Do not do endian conversions as they will be done in the host
>   - Report stats that reference a quantity of memory in bytes
>   - Minor coding style updates
>
> Changes since V2:
>   - Increase stat field size to 64 bits
>   - Report all sizes in kb (not pages)
>   - Drop anon_pages stat and fix endianness conversion
>
> Changes since V1:
>   - Use a virtqueue instead of the device config space
>
> When using ballooning to manage overcommitted memory on a host, a system for
> guests to communicate their memory usage to the host can provide information
> that will minimize the impact of ballooning on the guests.  The current method
> employs a daemon running in each guest that communicates memory statistics to a
> host daemon at a specified time interval.  The host daemon aggregates this
> information and inflates and/or deflates balloons according to the level of
> host memory pressure.  This approach is effective but overly complex since a
> daemon must be installed inside each guest and coordinated to communicate with
> the host.  A simpler approach is to collect memory statistics in the virtio
> balloon driver and communicate them directly to the hypervisor.
>
> This patch enables the guest-side support by adding stats collection and
> reporting to the virtio balloon driver.
>
>    

What about a spec update?  Did that happen and I just missed it?

-- 
error compiling committee.c: too many arguments to function

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