Re: [Xen-devel] [PATCH RFC] xen/console: buffer and show origin of guest PV writes

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.08.13 at 19:47, Daniel De Graaf <dgdegra@xxxxxxxxxxxxx> wrote:
> On 08/13/2013 12:52 PM, Jan Beulich wrote:
>>>>> On 13.08.13 at 18:34, Daniel De Graaf <dgdegra@xxxxxxxxxxxxx> wrote:
>>> 3. Should we change to allowing console output by default, since it is
>>> now controlled by log levels?
>>
>> I don't think we should, not the least because guest output doesn't
>> really specify a log level, and default log level messages make it
>> through with default options.
> 
> The existing HVM guest output is done with XENLOG_G_DEBUG, which was
> copied for the PV guest output. The default value of guest_loglvl on a
> debug build includes this output, but on a non-debug build hides it.

Okay, I didn't look closely enough then. Yet nevertheless, at least
for debugging purposes we routinely tell people to lower the log
level, and some tend to keep things that way in order to avoid
having to re-create an eventual problem with maximum output
enforced. And we wouldn't want to spam their consoles (and at
the same time make our lives harder when it comes to going
through those logs).

Jan


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