Re: Slab Unreclaimable is continually growing

[Reco <recoverym4n@enotuniq.net>]

	Hi.

On Wed, Jul 24, 2019 at 06:54:42PM +0200, Matthias Böttcher wrote:
>   OBJS ACTIVE  USE OBJ SIZE  SLABS OBJ/SLAB CACHE SIZE NAME
> 307534 304741  99%    0,20K  16186       19     64744K vm_area_struct
>  14280  14274  99%    3,69K   1785        8     57120K task_struct
> 178048 152224  85%    0,25K  11128       16     44512K filp
>   8536   8536 100%    4,00K   1067        8     34144K kmalloc-4096
>  14640  14640 100%    2,06K    976       15     31232K sighand_cache
> 
> How can I detect what is eating up my memory in SUnreclaim (slab unreclaimable)?

You did it already.
"vm_area_struct" is a kernel structure for anonymous memory allocations.
"task_struct" is a kernel structure for maintaining process execution.
"filp" is a kernel structure for virtual memory.

My guess is - a small number of processes that constantly allocate
memory in small numbers by executing brk(2) or its modern equivalents.

Or a relatively large number of short-lived processes.


I'd start with "pidstat -rl 1 10".

Reco