Re: page allocation failures on osd nodes

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On Mon, Jan 28, 2013 at 8:55 PM, Andrey Korolyov <andrey@xxxxxxx> wrote:
> On Mon, Jan 28, 2013 at 5:48 PM, Sam Lang <sam.lang@xxxxxxxxxxx> wrote:
>> On Sun, Jan 27, 2013 at 2:52 PM, Andrey Korolyov <andrey@xxxxxxx> wrote:
>>
>>> Ahem. once on almost empty node same trace produced by qemu
>>> process(which was actually pinned to the specific numa node), so seems
>>> that`s generally is a some scheduler/mm bug, not directly related to
>>> the osd processes. In other words, the less percentage of memory
>>> actually is an RSS, the more is a probability of such allocation
>>> failure.
>>
>> This might be a known bug in xen for your kernel?  The xen users list
>> might be able to help.
>> -sam
>
> It is vanilla-3.4, I really wonder from where comes paravirt bits in the trace.

Bug exposed only in 3.4 and really harmless, at least in ways I have
tested that. Ceph-osd memory allocation behavior more likely to
trigger those messages than most other applications in ``same''
conditions.
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