> I suspect that xenbaked uses it,
> http://lxr.xensource.com/lxr/source/tools/xenmon/xenbaked.c 
> ---
> 262 int eventchn_init(void)
> 263 {
> 264 int rc;
> 265
> 266 // to revert to old way:
> 267 if (0)
> 268 return -1;
> 269
> 270 xce_handle = xc_evtchn_open();
> 271
> 272 if (xce_handle < 0)
> 273 perror("Failed to open evtchn device");
> 274
> 275 if ((rc = xc_evtchn_bind_virq(xce_handle, VIRQ_TBUF)) == -1)
> 276 perror("Failed to bind to domain exception virq port");
> 277 virq_port = rc;
> 278
> 279 return xce_handle;
> 280 }
> ---
>
> With appropriate triggering, in xen/common/trace.c
Ah yes.
It should be fairly trivial to copy this code into xentrace.c and then replace 
the nanosleep with a wait on that event. This would probably be worthwhile 
as an interim solution until we figure out what next gen tracing ought to 
look like.
Cheers,
Mark
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