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Re: [Qemu-devel] [PATCH v7 0/7] push mmio dispatch out of big lock

From: Jan Kiszka
Subject: Re: [Qemu-devel] [PATCH v7 0/7] push mmio dispatch out of big lock
Date: Thu, 02 May 2013 19:14:54 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv: Gecko/20080226 SUSE/ Thunderbird/ Mnenhy/

On 2013-05-02 18:58, Jan Kiszka wrote:
> Hi Pingfan,
> On 2012-12-06 08:28, liu ping fan wrote:
>> Any suggestion? Or new design idea for this?
> Finally... I'm getting back to this. I'm currently trying to make use of
> this series, adapting it to my needs (selective BQL-free dispatching of
> PIO regions).
> Is there a newer version available on your side? This one obviously no
> longer applies due to all the code movements in QEMU. But it also seems
> to contain some bugs, at least in patch 5 (mixed up page number vs. page
> address around for address_space_section_lookup_ref).

Oh, and the series isn't bisectable between 5 and 7.


> Then we should get rid of the ref/unref callbacks. Making a memory
> region BQL-free must be as simple as setting a flag or (more likely)
> adding a reference to the owning QOM object in the region.
> Reimplementing ref/unref in device models over and over again is clearly
> a no-go. Maybe I'm currently forgetting a use case where overloading the
> reference functions is needed, so please help my memory in that case.
> Jan

Siemens AG, Corporate Technology, CT RTC ITP SDP-DE
Corporate Competence Center Embedded Linux

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