Re: [Qemu-devel] [PATCH, RFC] trace: implement guest tracepoint passthrough

[Avi Kivity]

On 08/26/2011 10:06 PM, Blue Swirl wrote:
> Let guests inject tracepoint data via fw_cfg device.

At least on x86, fw_cfg is pretty slow, involving multiple exits.  IMO, 
for kvm, even one exit per tracepoint is too high.  We need to use a 
shared memory transport with a way to order guest/host events later on 
(by using a clock).

--
error compiling committee.c: too many arguments to function