Re: [Xen-devel] Xen paging unit test

[Andres Lagar-Cavilla <andreslc@xxxxxxxxxxxxxx>]

On Sep 10, 2012, at 10:26 AM, Ian Campbell wrote:

> On Mon, 2012-09-10 at 15:08 +0100, Andres Lagar-Cavilla wrote:
>> Hi,
>> In the process of submitting the privcmd MMAP_BATCH_V2 patches for Linux 
>> 3.7, Konrad asked a very valid question:
>> 
>> "How do you test this thing?"
>> 
>> Turns out that you have two ways
>> 1. You do the actual paging thing on a live domain
>> 2. I had a unit test buried in my stash
>> 
>> Coincidentally, Ian C asked for demonstrable consumers of the
>> xenpaging interface in the process of summarizing the 4.2 change log.
>> 
>> I've github'ed my paging unit test in the hopes it will be found
>> useful, not only as a unit test, but also a demo/reference piece of
>> code. 
>> 
>> The unit test exercises the privcmd/libxc interface for creating
>> foreign mappings of paged out pages. As a precondition, it must create
>> a domain, enable paging on it, and act as a pager to satisfy the
>> page-in requests generated by the foreign maps.
>> 
>> https://github.com/andreslagarcavilla/xenpagingtest
> 
> I get a server error (cat holding a 500? so error code 500? nice way to
> obfuscate the useful info!) from this.
> 
> I stripped off a level and tried https://github.com/andreslagarcavilla
> but that gets me an angry unicorn saying "Page did not respond in a
> timely fashion.".
> 
> :-)

I think github is just having a hard time right now. Many people are getting 
visits from angry unicorns.

> 
> Is this similar to/derived from tools/xenpaging?

Not really derived. The test will set up a dummy domain, page it out, and set 
up a pager. In a child process it will perform a number of different foreign 
mapping operations and patterns and check that everything works out well.

Similar to xenpaging in that they need to do similar things for setting up 
paging and watching paging events. But the unit test can afford the luxury of 
going straight to the point without bothering about user input, xenstore, what 
not.

Andres

> 
>> 
>> This might be considered useful for tools/tests in xen-unstable, and I'll be 
>> happy to resubmit in a suitable form if you ask.
>> 
>> Cheers
>> Andres
> 
> 


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