Re: lot of MemAvailable but falling cache and raising PSI

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On 9/6/19 12:08 PM, Stefan Priebe - Profihost AG wrote:
> These are the biggest differences in meminfo before and after cached
> starts to drop. I didn't expect cached end up in MemFree.
> 
> Before:
> MemTotal:       16423116 kB
> MemFree:          374572 kB
> MemAvailable:    5633816 kB
> Cached:          5550972 kB
> Inactive:        4696580 kB
> Inactive(file):  3624776 kB
> 
> 
> After:
> MemTotal:       16423116 kB
> MemFree:         3477168 kB
> MemAvailable:    6066916 kB
> Cached:          2724504 kB
> Inactive:        1854740 kB
> Inactive(file):   950680 kB
> 
> Any explanation?

How does /proc/pagetypeinfo look like?
Also as Michal said, collecting the whole of /proc/vmstat (e.g. catting
it to vmstat.$TIMESTAMP once per second) when the bad situation is
happening, would be useful.
You could also try if the bad trend stops after you execute:
 echo never > /sys/kernel/mm/transparent_hugepage/defrag




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