Re: [Xen-devel] maximum memory size allocated by _xmalloc

["Chulmin Kim" <cmkim@xxxxxxxxxxxxxxxx>]

> On 11/07/12 10:13, Chulmin Kim wrote:
> > Hi all,
> >
> > I'm currently inserting my own code to adjust the several existing
> > memory ballooning works.
> >
> > To accomplish it, I manage some kind of statistics in Xen memory area.
> >
> > Using _xmalloc, I've allocated certain size of memory chunk for the
> > data structure. ( I varied it from 10kb to 24 MB.)
> >
> > When the size is equal to 24 MB, xen won't boot anymore.  (stuck
> > during the xmalloc, according to my debugging. _xmalloc returns NULL.)
> > There was no problem when the size is below 12MB.
> >
> > Is there any limitation such as max memory size for _xmalloc?
> >
> > I suspected xen heap size, but, it is no longer adjustable. Right?
> >
> > I hope somebody can give me a clue.  Thanks.
> 
> _xmalloc will first try to use the size pools for allocation, and failing
that, try to
> allocate full pages.
> 
> As it is returning NULL, this probably means you no longer have 24MB of
free
> contiguous RAM to allocate.
> 
> ~Andrew
> 

Thanks for the reply, Andrew.

I have to check the contiguity. 

If it is the cause of the problem, then, how can I detour this problem? 

Other xen part calling xmalloc_array does not handle this problem as far as
I know. (only consider it as an error)

Should I split the data structure into two or more chunks? 



> >
> >
> >
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> > http://lists.xen.org/xen-devel
> 
> --
> Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
> T: +44 (0)1223 225 900, http://www.citrix.com
> 
> 
> 
> 
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