Re: [Xen-devel] Debug event_channel.c

[Daniel Castro <evil.dani@xxxxxxxxx>]

On Tue, Sep 27, 2011 at 9:09 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> On Tue, 2011-09-27 at 12:36 +0100, Daniel Castro wrote:
>> On Tue, Sep 27, 2011 at 8:33 PM, Andrew Cooper
>> <andrew.cooper3@xxxxxxxxxx> wrote:
>> > On 27/09/11 12:09, Daniel Castro wrote:
>> >> Hello All,
>> >>
>> >> I am trying to debug event_channel.c for this I have filled the
>> >> functions with gdprintk(XENLOG_WARNING, "..."); yet the messages are
>> >> not displayed on dmesg or /var/log/xen. Where could they be printed?
>> >> or should I use a different function?
>> >>
>> >> In grub I have loglvl=all to print all messages...
>> >>
>> >> Thanks for the answer,
>> >>
>> >> Daniel
>> >>
>> >
>> > gdprintk only gets set with guest debugging enabled. ( guest_loglvl on
>> > the command line )
>> >
>> > My suggestion would be to just use regular printks and look at the
>> > serial log.
>>
>> How can can I look at the serial log from dom0?
>
> 'xl dmesg' (or using a serial cable of course ;-))
>
> You can also add XENCONSOLED_TRACE=hv in /etc/sysconfig/xencommons (or
> the equivalent on your distro, the effect should be to add --log=hv to
> the xenconsoled command line). Then the xen console will be logged
> under /var/log/xen somewhere.

Ian, thanks for the info.

This is the info I gathered:
(XEN) schedule.c:658:d1 DEBUG 1: START DO POLL port -32060 on
sched_poll.nr_ports 1
(XEN) schedule.c:719:d1 DEBUG 1: DO POLL test bit on port 2 exit here
-> if ( test_bit(port, &shared_info(d, evtchn_pending)) )
(XEN) schedule.c:746:d1 DEBUG 1: DO POLL GOTO out: check previus msg,
return rc=0
(XEN) event_channel.c:606:d1 DEBUG 1: set_pending
(XEN) event_channel.c:628:d1 DEBUG 1 : evtchn_set_pending test_bit AND
test_and_set_bit returned 0.
(XEN) event_channel.c:637:d1 DEBUG 1: evtchn_set_pending bitmap_empty return 0.

In my code test_bit_and_clear in Xenstore ring_wait is in fact
returning 0, it was expecting a one, the do_poll is finding the bit in
1 also according to test_bit, right?
So the error is on the my test_bit_and_clear. Am I reading it correctly?

Thanks all,

Daniel
>
> Ian.
>
>>
>> >
>> > --
>> > Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
>> > T: +44 (0)1223 225 900, http://www.citrix.com
>> >
>> >
>> > _______________________________________________
>> > Xen-devel mailing list
>> > Xen-devel@xxxxxxxxxxxxxxxxxxx
>> > http://lists.xensource.com/xen-devel
>> >
>>
>>
>>
>
>
>



-- 
+-=====---------------------------+
| +---------------------------------+ | This space intentionally blank
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| |   | Daniel Castro,                |
| |   | Consultant/Programmer.|
| |   | U Andes                         |
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