Re: [Qemu-devel] [PATCH 0/5] trace: Add events for vCPU memory accesses

[Peter Maydell <peter.maydell@linaro.org>]

On 2 March 2016 at 10:55, Stefan Hajnoczi <stefanha@gmail.com> wrote:
> On Tue, Feb 23, 2016 at 07:22:07PM +0100, Lluís Vilanova wrote:
>> NOTE: This series applies on top of "trace: Show vCPU info in guest code events"
>>
>> This series adds to new events:
>>
>> * guest_vmem: memory accesses performed by vCPUs (guest code)
>>
>> * guest_vmem_user_syscall: memory accesses performed by syscall emulation when
>>   running QEMU in user-mode.
>>
>> Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
>> ---
>>
>> Lluís Vilanova (5):
>>       exec: [tcg] Track which vCPU is performing translation and execution
>>       trace: [all] Add "guest_vmem" event
>>       user: Refactor lock_user body into do_lock_user
>>       user: Set current vCPU during syscall execution
>>       trace: [all] Add "guest_vmem_user_syscall" event

> Any comments from TCG folks?

The first two patches which add TCG guest data access tracing look
OK to me, but I'm much less sure about the last three which are
adding tracing into linux-user syscall emulation. I'm not sure
that lock_user is the right place to put that tracepoint.

thanks
-- PMM