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Re: [Qemu-devel] [PATCH 3/5] memory: Flush coalesced MMIO on mapping and

From: Jan Kiszka
Subject: Re: [Qemu-devel] [PATCH 3/5] memory: Flush coalesced MMIO on mapping and state changes
Date: Mon, 25 Jun 2012 13:13:14 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv: Gecko/20080226 SUSE/ Thunderbird/ Mnenhy/

On 2012-06-25 13:01, Avi Kivity wrote:
> On 06/25/2012 01:26 PM, Jan Kiszka wrote:
>> On 2012-06-25 12:15, Jan Kiszka wrote:
>>> On 2012-06-25 10:57, Avi Kivity wrote:
>>>> The repetitiveness of this code suggests a different way of doing this:
>>>> make every API call be its own subtransaction and perform the flush in
>>>> memory_region_begin_transaction() (maybe that's the answer to my
>>>> question above).
>>> So you want me to wrap the core of those services in
>>> begin/commit_transaction instead? Just to be sure I got the idea.
>> What we would lose this way (transaction_commit) is the ability to skip
>> updates on !mr->enabled.
> We could have an internal memory_region_begin_transaction_mr() which
> checks mr->enabled and notes it if its clear (but anything else would
> have to undo this).  I don't think it's worth it, let's lose the
> optimization and see if it shows up anywhere.

OK, will send a new series with a conversion of this included.


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