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Re: [Qemu-devel] [RFC v2 08/11] tcg: add options for enabling MTTCG

From: Sergey Fedorov
Subject: Re: [Qemu-devel] [RFC v2 08/11] tcg: add options for enabling MTTCG
Date: Tue, 12 Apr 2016 16:19:42 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

On 12/04/16 16:03, Pavel Dovgalyuk wrote:
>> From: address@hidden [mailto:address@hidden
>> On 12/04/16 15:50, KONRAD Frederic wrote:
>>>> Yes, but users may like to have an option to disable MTTCG for some
>>>> reason. I'm also concerned about icount mode: not sure how to account
>>>> virtual time when all vCPUs run in parallel.
>>> I'm thinking the same, we don't have a solution for icount yet.
>>> The reverse execution support is probably badly broken as well.
>> Reverse execution doesn't even seem to support more than a single core.
>> As of icount, it looks like to be incompatible with MTTCG.
> It doesn't, because there is no multicore support for tcg yet.
> I think, that we have to find some solution for icount (even if it will be 
> slow).

Synchronize all vCPUs against their instruction counters? I wonder would
it be of much use in MTTCG mode if it turns out to be quite slow?
Anyhow, valid point, we should think about it.

Kind regards,

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