Re: [Xen-devel] [PATCH 3/3] xl: 'xl info' print outstanding claims if enabled (claim_mode=1 in xl.conf)

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Mon, Apr 08, 2013 at 05:41:07PM +0100, Ian Jackson wrote:
> Konrad Rzeszutek Wilk writes ("[Xen-devel] [PATCH 3/3] xl: 'xl info' print 
> outstanding claims if enabled (claim_mode=1 in xl.conf)"):
> > +=item B<outstanding_claims>
> > +
> > +When a claim call is done (see L<xl.conf>) a reservation for a specific
> > +amount of pages is set and also a global value is incremented. This
> > +global value (outstanding_claims) is then reduced as the domain's memory
> > +is populated and eventually reaches zero. The toolstack can also choose
> > +to set the domain's claim to zero which cancels the reservation and
> > +decrements the global value by the amount of claim that has not been
> > +satisfied. Most of the time the value will be zero, but if you are
> > +launching multiple guests, and B<claim_mode> is enabled, this value
> > +can increase/decrease.
> 
> OK, thanks, this is clear enough in general.
> 
> But you need to explain how the user can get the toolstack to set the
> domain's claim to zero.

I can certainly include that. It does that once the guest has been started
(also the hypervisor sets it to zero as the pages get allocated for the guest).

> 
> And you need to explain whether the memory counted in
> outstanding_claims value is _also_ counted as free memory, or as
> memory belonging to its respective domain(s).

Sure thing.
> 
> > +uint64_t libxl_get_claiminfo(libxl_ctx *ctx)
> > +{
> > +    long l;
> > +
> > +    l = xc_domain_get_outstanding_pages(ctx->xch);
> > +    if (l < 0) {
> > +        LIBXL__LOG_ERRNOVAL(ctx, LIBXL__LOG_WARNING, l, 
> > "xc_domain_get_outstanding_pages failed.");
> 
> This needs wrapping to 75 columns or so.

OK. Do you prefer the "xc..." to be split up or on a seperate line?
> 
> Also, is there a way to find out which domain these claims belong to ?
> I didn't see it in your previous patch.

It is possible - the two patches that would have exported said information
to xcinfo were dropped as I was unsure where to display this. As in I could
alter 'xl list' or 'xl mem-list' to contain that information, but that would
change the syntax of the printout. I don't know if that is OK? 

Or I can introduce a new command 'xl claim-list' ? That would give that 
information?
> 
> Thanks,
> Ian.

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