linux-kernel - Re: [RFC] Reproducible OOM with partial workaround

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Date:	Fri, 11 Jan 2013 11:46:06 +1100
From:	paul.szabo@...ney.edu.au
To:	dave@...ux.vnet.ibm.com
Cc:	695182@...s.debian.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [RFC] Reproducible OOM with partial workaround

Dear Dave,

> Your configuration has never worked.  This isn't a regression ...
> ... does not mean that we expect it to work.

Do you mean that CONFIG_HIGHMEM64G is deprecated, should not be used;
that all development is for 64-bit only?

> ... 64-bit kernels should basically be drop-in replacements ...

Will think about that. I know all my servers are 64-bit capable, will
need to check all my desktops.

---

I find it puzzling that there seems to be a sharp cutoff at 32GB RAM,
no problem under but OOM just over; whereas I would have expected
lowmem starvation to be gradual, with OOM occuring much sooner with
64GB than with 34GB. Also, the kernel seems capable of reclaiming
lowmem, so I wonder why does that fail just over the 32GB threshhold.
(Obviously I have no idea what I am talking about.)

---

Thanks, Paul

Paul Szabo   psz@...hs.usyd.edu.au   http://www.maths.usyd.edu.au/u/psz/
School of Mathematics and Statistics   University of Sydney    Australia
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