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xen-devel
Re: [Xen-devel] file corruption!!!
> I'm not in a position to test this, but is it possible that the corruption
> problem could manifest itself after an out of memory condition? When I first
> noticed the corruption I rebooted as quickly as possible so it didn't
> continue and so didn't check, but it's possible that it ran out of memory
> first. I guess I could test this but don't really want to do anything to risk
> corruption any further :)
>
> speaking of memory, I have 3 domains running currently, 0 + 2U, all declared
> with 128mb memory, but xm list shows this:
> Dom Name Mem(MB) CPU State Time(s)
> 0 Domain-0 119 0 r---- 1293.0
> 6 gaia 127 1 -b--- 81.9
> 7 mail2 126 0 -b--- 1597.9
>
> 'free' under mail2 and gaia shows 128124 as the total amount of memory.
>
> I appreciate that maybe something about dom0 means that it shows something
> different, but why would the other two report different amounts of memory
> when they both have the same amount??? Both are running identical kernels.
>
> James
The backend network and blkdev drivers in DOM0 allocate multi-MB
chunks of memory, then free all the pages in that chunk back to Xen.
The chunks are then used for ephemeral mappings of I/O buffers from
frontend drivers in other guest OSes.
The total used for this is about 7 or 8MB, so DOM0's estimate of its
memory allocation will be thrown off by about that amount. It doesn't
realise that those large allocated chunks have had all their memory
released. :-)
-- Keir
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