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xen-devel
Re: [Xen-devel] throttling logs messages from qemu
On Fri, 31 Jul 2009, James Harper wrote:
> I see that in 3.4.x, throttling has been changed from a file in /etc to
> a xenstore entry, as per the following code:
>
> throttling = xenstore_vm_read(domid, "log-throttling", &len);
> if (throttling != NULL) {
> throttling_disabled = (throttling[0] - '0');
> free(throttling);
> }
>
> A bit of searching tells me that the full path of the key is
> /vm/<uuid>/log-throttling, but it appears to be read at boot. How can I
> get it written in there in time?
>
Good question :)
You could hack xend but it is not exactly something you want to do.
Another possibility is to change your device_model in the vm config file
to a bash script that does what you want and then calls qemu-dm with the
right arguments.
We could probably modify qemu to read the xenstore key from another
place that is easier to know before the VM is started.
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