Re: [Xen-devel] [PATCH] Add Small Memory Warning to XM for create and mem-set

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Mark Williamson wrote:
> I really like this idea.  I think it's most important for ballooning, which is 
> a really easy way to get a domain to commit suicide otherwise ;-)
> I'd quite like to see it implemented Xend-side, though, with the "warning 
> level" configurable (and probably disablable) in the xend-config.sxp so that 
> users who really do want to create very small domUs can tweak the system not 
> to warn them.
>   
I'm not sure I agree that Xend is the right place to do this.  You would 
have to add another parameter to the either the domain config or to the 
actual create() call that basically had the semantics of "if memory is 
less than X, throw an exception."  That seems like a rather awkward 
addition to the interface and it makes client code harder to write.
I'll attempt to be telepathic here and guess that you suggested this 
because there's no xm config file so there's no easy way to be able to 
tell xm to never give an error when mem is too small?  I think this is a 
good point in time to start thinking about just implementing an xm 
config file.
If you use SafeConfigParser and just grab from a standard location (say 
/etc/xen/xm.conf), you should be able to do it properly (just within xm) 
with very little code.
Thoughts?

Regards,

Anthony Liguori

> Cheers,
> Mark
>
> On Friday 21 April 2006 16:17, Daniel Stekloff wrote:
>   
> > Hi,
> >
> > This patch adds a warning to xm for creating and setting a domain's
> > memory under 32 MBs. Patch adds a "--force-mem" option to "xm create"
> > and "xm mem-set" commands for creating or setting memory less than 32
> > MBs. Patch also updates man page and user manual.
> >
> > All comments welcome.
> >
> > Thanks,
> >
> > Dan
> >     
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