Re: [Qemu-devel] [PATCH 00/12] trace: [tcg] Allow tracing guest events in TCG-generated code

[Peter Maydell]

On 7 February 2014 14:49, Richard Henderson <address@hidden> wrote:
> On 02/06/2014 11:26 AM, Lluís Vilanova wrote:
>>> > At which point, option 2 would be the best bet, I think.
>> Right. For the 3rd option I was also thinking about having per-vCPU tracing
>> states (in the case of guest events), so that you can trace separate events
>> depending on the vCPU.
>>
>> Which reminds me, I should add a vCPU pointer to the "guest_vmem" event, 
>> since
>> otherwise you cannot differentiate accesses among different vCPUs.
>
> The TB cache is shared, so you won't be able to do option 3 for different
> events for different cpus.  You could only do option 1 for that

I have a vague plan in the back of my mind that we should make the
TB cache be per-CPU, as a step towards better handling of multithreaded
linux-user guest binaries and also heterogenous multiple CPU support...

thanks
-- PMM