Re: lot of MemAvailable but falling cache and raising PSI

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Am 10.09.19 um 15:05 schrieb Stefan Priebe - Profihost AG:
> 
> Am 10.09.19 um 14:57 schrieb Michal Hocko:
>> On Tue 10-09-19 14:45:37, Stefan Priebe - Profihost AG wrote:
>>> Hello Michal,
>>>
>>> ok this might take a long time. Attached you'll find a graph from a
>>> fresh boot what happens over time (here 17 August to 30 August). Memory
>>> Usage decreases as well as cache but slowly and only over time and days.
>>>
>>> So it might take 2-3 weeks running Kernel 5.3 to see what happens.
>>
>> No problem. Just make sure to collect the requested data from the time
>> you see the actual problem. Btw. you try my very dumb scriplets to get
>> an idea of how much memory gets reclaimed due to THP.
> 
> You mean your sed and sort on top of the trace file? No i did not with
> the current 5.3 kernel do you think it will show anything interesting?
> Which line shows me how much memory gets reclaimed due to THP?

Is something like a kernel memory leak possible? Or wouldn't this end up
in having a lot of free memory which doesn't seem usable.

I also wonder why a reclaim takes place when there is enough memory.

Greets,
Stefan




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