[Qemu-devel] Re: [PATCH 20/32] accel_trace_io

[Anthony Liguori]

Glauber Costa wrote:
> From: Glauber Costa <address@hidden>
>
> kqemu keeps trace of the last io done. Do it through
> an accel_wrapper.
>   

The hooks here are probably not the best they could be.  The purpose of 
this code in kqemu, from what I can tell, is to control how long we run 
in softmmu before trying to run in the kernel again.  I presume this is 
mainly for kernel-kqemu.

When kernel-kqemu encounters an instruction it can't handle, it drops to 
userspace and runs in softmmu for a while.  The question is how long 
should it run in softmmu and this is a heuristic.  This is what the code 
is doing.

Regards,

Anthony Liguori