Re: [Xen-devel] LTTng Xen port

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> 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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