Memory management issue on RPi?

[Michael Tuexen]

> On 12 Nov 2015, at 19:09, Konstantin Belousov <kostikbel at gmail.com> wrote:
> 
> On Thu, Nov 12, 2015 at 06:57:03PM +0100, Michael Tuexen wrote:
>>> On 12 Nov 2015, at 18:12, Konstantin Belousov <kostikbel at gmail.com> wrote:
>>> 
>>> On Thu, Nov 12, 2015 at 05:25:37PM +0100, Michael Tuexen wrote:
>>>>> On 12 Nov 2015, at 13:18, Konstantin Belousov <kostikbel at gmail.com> wrote:
>>>>> This is a known problem with the swap-less OOM.  The following patch
>>>>> should give you an immediate relief.  You might want to tweak
>>>>> sysctl vm.pageout_oom_seq if default value is not right, it was selected
>>>>> by 'try and see' approach on very small (32 or 64MB) i386 VM.
>>>> It just works... Will do some more testing...
>>> 
>>> I am more interested in report if OOM was triggered when it should.
>> How do I know? What output do you want to see?
>> 
>> Best regards
>> Michael
>>> 
>>> Try running several instances of 'sort /dev/zero'.
> ^^^^^^^^^^^^^ I already answered this.
> Run sort /dev/zero, and see whether OOM fires.
OK, now I understand. You want to see if some processes are getting killed.
(I was thinking that you might want to see some sysctl counters or so).

Results:
* I'm able to compile/link/install a kernel from source. This was not
  possible before.
* When running three instances of sort /dev/zero, two of them get killed
  after a while (less than a minute). One continued to run, but got also
  kill eventually. All via ssh login.

Let me know if you want me to do some more testing.

Best regards
Michael
>