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Re: [PATCH] tests/acceptance: test hot(un)plug of ccw devices

From: Thomas Huth
Subject: Re: [PATCH] tests/acceptance: test hot(un)plug of ccw devices
Date: Thu, 3 Dec 2020 19:14:11 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.3.1

On 03/12/2020 19.11, Philippe Mathieu-Daudé wrote:
> On 12/3/20 6:22 PM, Thomas Huth wrote:
>> On 03/12/2020 16.39, Cornelia Huck wrote:
>>> Hotplug a virtio-net-ccw device, and then hotunplug it again.
>> Good idea! ... is it also possible with a pci device?
>>> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
>>> ---
> ...
>>> +        exec_command_and_wait_for_pattern(self, 'dmesg | tail -n 1', 'CRW')
>> That looks like it could be a little bit racy ... what if the kernel outputs
>> another log message by chance, so that tail -n 1 reports that instead.
>> I think it would be better to clear the dmesg log ("dmesg -c") before
>> plugging, and then look at all the new output of "dmesg" without using
>> "tail" afterwards.
> "dmesg --follow"?

Then you'd need to send control-c afterwards to stop it? ... not sure
whether that's such a better solution...


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