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Re: [Qemu-devel] [RFC] Memory API
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] [RFC] Memory API |
Date: |
Thu, 19 May 2011 15:36:53 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2011-05-19 15:35, Anthony Liguori wrote:
> On 05/19/2011 08:26 AM, Avi Kivity wrote:
>> On 05/19/2011 04:23 PM, Anthony Liguori wrote:
>>>> Actually, things are a bit more complicated: This layer has to properly
>>>> adopt the coalescing properties of underlying regions or we cause
>>>> performance regressions to VGA emulation. That means it has to register
>>>> dispatching slots of the corresponding size and set the coalescing flag
>>>> accordingly. And it likely need to adjust them as the regions below
>>>> change.
>>>
>>>
>>> As I mentioned in another thread, I don't think we want to "design"
>>> coalescing into the API. Coalescing is something that breaks through
>>> abstractions layers and is really just a hack.
>>
>> It's impossible not to design it into the API. The layer which wants to
>> do coalescing (the device) has no idea if and where its memory is mapped.
>
> There's two places coalescing currently matters: VGA and PCI devices.
> Since VGA is just a special PCI device, let's just focus on PCI devices.
Every frame buffer device, PCI or not, benefits from it. Don't focus on
PCI or x86.
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
- Re: [Qemu-devel] [RFC] Memory API, (continued)
- Re: [Qemu-devel] [RFC] Memory API, Avi Kivity, 2011/05/20
- Re: [Qemu-devel] [RFC] Memory API, Blue Swirl, 2011/05/20
- Re: [Qemu-devel] [RFC] Memory API, Avi Kivity, 2011/05/22
- Re: [Qemu-devel] [RFC] Memory API, Jan Kiszka, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Anthony Liguori, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Jan Kiszka, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Avi Kivity, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Anthony Liguori, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API,
Jan Kiszka <=
- Re: [Qemu-devel] [RFC] Memory API, Avi Kivity, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Avi Kivity, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Avi Kivity, 2011/05/19
- Re: [Qemu-devel] [RFC] Memory API, Avi Kivity, 2011/05/18
- Re: [Qemu-devel] [RFC] Memory API, Jan Kiszka, 2011/05/18
- Re: [Qemu-devel] [RFC] Memory API, Avi Kivity, 2011/05/18
- Re: [Qemu-devel] [RFC] Memory API, Jan Kiszka, 2011/05/18
- Re: [Qemu-devel] [RFC] Memory API, Avi Kivity, 2011/05/18
- Re: [Qemu-devel] [RFC] Memory API, Jan Kiszka, 2011/05/18
- Re: [Qemu-devel] [RFC] Memory API, Avi Kivity, 2011/05/18