Re: lot of MemAvailable but falling cache and raising PSI

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On Thu 05-09-19 13:27:10, Stefan Priebe - Profihost AG wrote:
> Hello all,
> 
> i hope you can help me again to understand the current MemAvailable
> value in the linux kernel. I'm running a 4.19.52 kernel + psi patches in
> this case.
> 
> I'm seeing the following behaviour i don't understand and ask for help.
> 
> While MemAvailable shows 5G the kernel starts to drop cache from 4G down
> to 1G while the apache spawns some PHP processes. After that the PSI
> mem.some value rises and the kernel tries to reclaim memory but
> MemAvailable stays at 5G.
> 
> Any ideas?

Can you collect /proc/vmstat (every second or so) and post it while this
is the case please?
-- 
Michal Hocko
SUSE Labs



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