Re: Is btrfs related to OOM death problems on my 8GB server with both 3.15.1 and 3.14?

[Russell Coker <russell@coker.com.au>]

On Thu, 3 Jul 2014 18:19:38 Marc MERLIN wrote:
> I upgraded my server from 3.14 to 3.15.1 last week, and since then it's been
> running out of memory and deadlocking (panic= doesn't even work).
> I downgraded back to 3.14, but I already had the problem once since then.

Is there any correlation between such problems and BTRFS operations such as 
creating snapshots or running a scrub/balance?

Back in ~3.10 days I had serious problems with BTRFS memory use when removing 
multiple snapshots or balancing.  But at about 3.13 they all seemed to get 
fixed.

I usually didn't have a kernel panic when I had such problems (although I 
sometimes had a system lock up solid such that I couldn't even determine what 
it's problem was).  Usually the Oom handler started killing big processes such 
as chromium when it shouldn't have needed to.

Note that I haven't verified that the BTRFS memory use is reasonable in all 
such situations.  Merely that it doesn't use enough to kill my systems.

-- 
My Main Blog         http://etbe.coker.com.au/
My Documents Blog    http://doc.coker.com.au/