Re: [PATCH] Prevent OOM from killing init

[Jonathan Morton]

>> My patch already fixes OOM problems caused by overgrown caches/buffers, by
>> making sure OOM is not triggered until these buffers have been cannibalised
>> down to freepages.high.  If balancing problems still exist, then they
>> should be retuned with my patch (or something very like it) in hand, to
>> separate one problem from the other.  AFAIK, balancing should now be a
>> performance issue rather than a stability issue.
>
>Great.  I haven't seen your patch yet as my gateway ate it's very last
>disk.  I look forward to reading it.

I'm currently investigating the old non-overcommit patch, which (apart from
needing manual applying to recent kernels) appears to be rather broken in a
trivial way.  It prevents allocation if total reserved memory is greater
than the total unallocated memory.  Let me say that again, a different way
- it prevents memory usage from exceeding 50%...

Is there a fast way of getting total VM size?  Eg. equivalent to the
following code:

si_meminfo(&i);
si_swapinfo(&i);
free = i.totalram + i.totalswap;

If not, I have to do some jiggery to keep good performance along with true
non-overcommittance.

--------------------------------------------------------------
from:     Jonathan "Chromatix" Morton
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