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Re: [Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by de
From: |
Aurelien Jarno |
Subject: |
Re: [Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by default |
Date: |
Mon, 7 Feb 2011 22:45:51 +0100 |
User-agent: |
Mutt/1.5.18 (2008-05-17) |
On Mon, Feb 07, 2011 at 03:02:03PM -0600, Anthony Liguori wrote:
> On 02/07/2011 11:10 AM, Jan Kiszka wrote:
>> On 2011-02-07 17:23, Paolo Bonzini wrote:
>>
>>> On 02/07/2011 05:03 PM, Marcelo Tosatti wrote:
>>>
>>>> Is there any other issue that prevents turning CONFIG_IOTHREAD on by
>>>> default?
>>>>
>>> I think Windows support.
>>>
>>> Signal support is actually easy because we can "hack" the IPI as
>>> "suspend the VCPU thread+do work in the iothread context+resume the VCPU
>>> thread" (the IPI handler doesn't longjmp).
>>>
>>> Threading primitives support is tricky but not hard (there is lots of
>>> code around, especially if you can make assumptions such as "always hold
>>> the mutex while signaling a cond. variable").
>>>
>> !CONFIG_IOTHREAD code is doomed to bitrot once we switch to default
>> iothread mode. So if Windows support is not converted to a threading
>> model with moderate differences to POSIX, it will likely bitrot a well.
>> Therefore, conversion should be started rather sooner than later (by
>> someone interested in that platform).
>>
>
> As far as I'm concerned, Windows support is already deprecated as noone
> has stepped up to enhance it or support for a number of years now. We
> shouldn't remove existing code that supports it or refuse to take
> reasonable patches but if enabling IO thread by default breaks it, so be
> it.
As far as I see, Blue Swirl and Stefan Weil are regularly committing
fixes for win32. Stefan Weil is also providing win32 binaries on his
website [1]. I wouldn't call that deprecated.
[1] http://qemu.weilnetz.de/
--
Aurelien Jarno GPG: 1024D/F1BCDB73
address@hidden http://www.aurel32.net
- Re: [Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by default, Marcelo Tosatti, 2011/02/07
- Re: [Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by default, Marcelo Tosatti, 2011/02/07
- Re: [Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by default, Paolo Bonzini, 2011/02/07
- [Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by default, Jan Kiszka, 2011/02/07
- Re: [Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by default, Anthony Liguori, 2011/02/07
- Re: [Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by default,
Aurelien Jarno <=
- Re: [Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by default, Anthony Liguori, 2011/02/07
- Re: [Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by default, Aurelien Jarno, 2011/02/08
- [Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by default, Paolo Bonzini, 2011/02/08
- [Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by default, Jan Kiszka, 2011/02/08
- [Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by default, Aurelien Jarno, 2011/02/08
- Re: [Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by default, Anthony Liguori, 2011/02/08
- Re: [Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by default, Paolo Bonzini, 2011/02/08
- [Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by default, Jan Kiszka, 2011/02/08
- [Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by default, Aurelien Jarno, 2011/02/08
- [Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by default, Jan Kiszka, 2011/02/08