[linux-lvm] LVM/Devicemapper kernel level breakage?
Sven Eschenberg
sven at whgl.uni-frankfurt.de
Wed Jul 21 00:00:04 UTC 2010
Follow up:
This behavior occurs with kernel 2.6.34.1 - with 2.6.33.5 I do not see
this irrational behavior. Though the flush threads pop up in top
regularly, they 'only' eat up 1-2% of CPU for the system. Should this go
to LKML?
Regards
-Sven
On Sun, 2010-07-18 at 21:18 +0200, Sven Eschenberg wrote:
> Hi list, I am having difficulties with one of my boxes.
>
> Mainly this:
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 2262 root 20 0 0 0 0 R 25 0.0 836:51.10 flush-253:2
> 2363 root 20 0 0 0 0 R 25 0.0 838:28.16 flush-253:6
> 2364 root 20 0 0 0 0 R 25 0.0 916:14.92 flush-253:4
> 2365 root 20 0 0 0 0 R 25 0.0 855:02.50 flush-253:1
> 2362 root 20 0 0 0 0 R 23 0.0 916:14.92 flush-253:5
> 3090 root 20 0 0 0 0 R 23 0.0 853:27.24 flush-253:3
>
> I was wondering what these flush processes are, I could determine they are
> kernel based threads (as far as I can see).
> Since they are called flush, I'd asume they have to do with flushing
> buffers or whatsoever, so I came to the conclusion, that the numbers might
> be major:minor pairs.
>
> Using lvs, I get:
>
> LV KMaj KMin
> Root 253 1
> home 253 3
> var 253 2
> usr 253 5
> usr.portage 253 4
> www 253 6
>
> And I certainly do not believe that there should be flush proceses hogging
> the CPU 24/7, and al those threads belong to logical volumes, or devie
> mapper devices (there are more, with a little les cpu time created by
> kpartx).
>
> Is this a known bug? Any recommendation what to do?
>
> Regards
>
> -Sven
>
>
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