Re: lot of MemAvailable but falling cache and raising PSI

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Am 09.09.19 um 14:08 schrieb Michal Hocko:
> On Mon 09-09-19 13:01:36, Michal Hocko wrote:
>> and that matches moments when we reclaimed memory. There seems to be a
>> steady THP allocations flow so maybe this is a source of the direct
>> reclaim?
> 
> I was thinking about this some more and THP being a source of reclaim
> sounds quite unlikely. At least in a default configuration because we
> shouldn't do anything expensinve in the #PF path. But there might be a
> difference source of high order (!costly) allocations. Could you check
> how many allocation requests like that you have on your system?
> 
> mount -t debugfs none /debug
> echo "order > 0" > /debug/tracing/events/kmem/mm_page_alloc/filter
> echo 1 > /debug/tracing/events/kmem/mm_page_alloc/enable
> cat /debug/tracing/trace_pipe > $file

Just now or when PSI raises?

Greets,
Stefan



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