Re: [Xen-devel] Kernel 3.11 / 3.12 OOM killer and Xen ballooning

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 09.12.13 at 18:50, James Dingwall <james.dingwall@xxxxxxxxxxx> wrote:
> Since 3.11 I have noticed that the OOM killer quite frequently triggers 
> in my Xen guest domains which use ballooning to increase/decrease their 
> memory allocation according to their requirements.  One example domain I 
> have has a maximum memory setting of ~1.5Gb but it usually idles at 
> ~300Mb, it is also configured with 2Gb swap which is almost 100% free.
> 
> # free
>               total       used       free     shared    buffers cached
> Mem:        272080     248108      23972          0 1448      63064
> -/+ buffers/cache:     183596      88484
> Swap:      2097148          8    2097140
> 
> There is plenty of available free memory in the hypervisor to balloon to 
> the maximum size:
> # xl info | grep free_mem
> free_memory            : 14923

But you don't tell us how you trigger the process of re-filling
memory. Yet that's the crucial point here; the fact that there is
enough memory available in the hypervisor is only a necessary
prerequisite.

Jan


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