Re: memcg swappiness (Re: memo: mem+swap controller)

[Balbir Singh <balbir@linux.vnet.ibm.com>]

YAMAMOTO Takashi wrote:
>> YAMAMOTO Takashi wrote:
>>> hi,
>>>
>>>>>> I do intend to add the swappiness feature soon for control groups.
>>>>>>
>>>>> How does it work?
>>>>> Does it affect global page reclaim?
>>>>>
>>>> We have a swappiness parameter in scan_control. Each control group indicates
>>>> what it wants it swappiness to be when the control group is over it's limit and
>>>> reclaim kicks in.
>>> the following is an untested work-in-progress patch i happen to have.
>>> i'd appreciate it if you take care of it.
>>>
>> Looks very similar to the patch I have. You seemed to have made much more
>> progress than me, I am yet to look at the recent_* statistics. How are the test
>> results? Are they close to what you expect?  Some comments below
> 
> it's mostly untested as i said above.  i'm wondering how to test it.
> 

I did a simple test

1. Run a RSS hungry (touch malloc'ed pages) and dd in the same control group
2. Tweak swappiness to see if the result is desirable

Not a complex test, but a good starting point :)

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>