[Question] how to detect mm leaker and kill?

[Question] how to detect mm leaker and kill?

[Hillf Danton]

Hi

In the scenario that 2GB  physical RAM is available, and there is a
database application that eats 1.4GB RAM without leakage already
running, another leaker who leaks 4KB an hour is also running, could
the leaker be detected and killed in mm/oom_kill.c with default
configure when oom happens?

thanks
          Hillf

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Re: [Question] how to detect mm leaker and kill?

[David Rientjes]

On Fri, 6 May 2011, Hillf Danton wrote:

> Hi
> 
> In the scenario that 2GB  physical RAM is available, and there is a
> database application that eats 1.4GB RAM without leakage already
> running, another leaker who leaks 4KB an hour is also running, could
> the leaker be detected and killed in mm/oom_kill.c with default
> configure when oom happens?
> 

Yes, if you know the database application is going to use 70% of your 
system RAM and you wish to discount that from its memory use when being 
considered for oom kill, set its /proc/pid/oom_score_adj to -700.

This is only possible on 2.6.36 and later kernels when oom_score_adj was 
introduced.

If you'd like to completely disable oom killing, set 
/proc/pid/oom_score_adj to -1000.

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Re: [Question] how to detect mm leaker and kill?

[Hillf Danton]

On Sat, May 7, 2011 at 6:48 AM, David Rientjes <rientjes@google.com> wrote:
> On Fri, 6 May 2011, Hillf Danton wrote:
>
>> Hi
>>
>> In the scenario that 2GB  physical RAM is available, and there is a
>> database application that eats 1.4GB RAM without leakage already
>> running, another leaker who leaks 4KB an hour is also running, could
>> the leaker be detected and killed in mm/oom_kill.c with default
>> configure when oom happens?
>>
>
> Yes, if you know the database application is going to use 70% of your
> system RAM and you wish to discount that from its memory use when being
> considered for oom kill, set its /proc/pid/oom_score_adj to -700.
>
> This is only possible on 2.6.36 and later kernels when oom_score_adj was
> introduced.
>
> If you'd like to completely disable oom killing, set
> /proc/pid/oom_score_adj to -1000.
>

Thank you very much, David, for cool answer to my question.

Hillf

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