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Re: [Qemu-devel] [patch v4 00/16] push mmio dispatch out of big lock


From: Avi Kivity
Subject: Re: [Qemu-devel] [patch v4 00/16] push mmio dispatch out of big lock
Date: Thu, 25 Oct 2012 19:07:46 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:16.0) Gecko/20121016 Thunderbird/16.0.1

On 10/25/2012 04:04 PM, Peter Maydell wrote:
> On 22 October 2012 10:23, Liu Ping Fan <address@hidden> wrote:
>> v1:
>> https://lists.gnu.org/archive/html/qemu-devel/2012-07/msg03312.html
>>
>> v2:
>> http://lists.gnu.org/archive/html/qemu-devel/2012-08/msg01275.html
>>
>> v3:
>> http://lists.nongnu.org/archive/html/qemu-devel/2012-09/msg01474.html
> 
> Is there a clear up to date description somewhere of the design and
> locking strategy here somewhere? I'd rather not have to try to
> reconstitute it by reading the whole patchset...

It was described somewhere in a document by Marcelo and myself.
Basically the goal is to arrive at

address_space_write():
  rcu_read_lock()
  mr = lookup()
  mr->ref()
  rcu_read_unlock()

  mr->dispatch()

  mr->unref()

This is the same strategy used in many places in the kernel.

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



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