Re: OOM killer changes

[Ralf-Peter Rohbeck <Ralf-Peter.Rohbeck@quantum.com>]

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On 18.08.2016 13:12, Vlastimil Babka wrote:
> On 18.8.2016 22:01, Ralf-Peter Rohbeck wrote:
>> On 17.08.2016 23:57, Vlastimil Babka wrote:
>>>>>> Hmm. I added linux-next git, fetched it etc but apparently I didn't check
>>>>>> out the right branch. Do you want next-20160817?
>>>>> Yes this one should be OK. It contains Vlastimil's patches.
>>>>>
>>>>> Thanks!
>>>> This has been working so far. I built a kernel successfully, with dd
>>>> writing to two drives. There were a number of messages in the trace pipe
>>>> but compaction/migration always succeeded it seems.
>>>> I'll run the big torture test overnight.
>>> Good news, thanks. Did you also apply Joonsoo's suggested removal of
>>> suitable_migration_target() check, or is this just the linux-next
>>> version with added trace_printk()/pr_info()?
>>>
>>> Vlastimil
>> Yes, that change was in my test with linux-next-20160817. Here's the diff:
>>
>> diff --git a/mm/compaction.c b/mm/compaction.c
>> index f94ae67..60a9ca2 100644
>> --- a/mm/compaction.c
>> +++ b/mm/compaction.c
>> @@ -1083,8 +1083,10 @@ static void isolate_freepages(struct
>> compact_control *cc)
>>                           continue;
>>
>>                   /* Check the block is suitable for migration */
>> +/*
>>                   if (!suitable_migration_target(page))
>>                           continue;
>> +*/
> OK, could you please also try if uncommenting the above still works without OOM?
> Or just plain linux-next-20160817, I guess we don't need the printk's to test
> this difference.
>
> Thanks a lot!
> Vlastimil
>
With the two lines back in I had OOMs again. See the attached logs.


Ralf-Peter


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