Re: lot of MemAvailable but falling cache and raising PSI

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Am 09.09.19 um 13:49 schrieb Vlastimil Babka:
> On 9/9/19 10:54 AM, Stefan Priebe - Profihost AG wrote:
>>> Do you have more snapshots of /proc/vmstat as suggested by Vlastimil and
>>> me earlier in this thread? Seeing the overall progress would tell us
>>> much more than before and after. Or have I missed this data?
>>
>> I needed to wait until today to grab again such a situation but from
>> what i know it is very clear that MemFree is low and than the kernel
>> starts to drop the chaches.
>>
>> Attached you'll find two log files.
> 
> Thanks, what about my other requests/suggestions from earlier?

Sorry i missed your email.

> 1. How does /proc/pagetypeinfo look like?

# cat /proc/pagetypeinfo
Page block order: 9
Pages per block:  512

Free pages count per migrate type at order       0      1      2      3
     4      5      6      7      8      9     10
Node    0, zone      DMA, type    Unmovable      1      0      0      1
     2      1      1      0      1      0      0
Node    0, zone      DMA, type      Movable      0      0      0      0
     0      0      0      0      0      1      3
Node    0, zone      DMA, type  Reclaimable      0      0      0      0
     0      0      0      0      0      0      0
Node    0, zone      DMA, type   HighAtomic      0      0      0      0
     0      0      0      0      0      0      0
Node    0, zone      DMA, type      Isolate      0      0      0      0
     0      0      0      0      0      0      0
Node    0, zone    DMA32, type    Unmovable   1141    970    903    628
   302    106     27      4      0      0      0
Node    0, zone    DMA32, type      Movable    274    269    368    396
   342    265    214    178    113     12     13
Node    0, zone    DMA32, type  Reclaimable     81     57    134    114
    60     50     25      4      2      0      0
Node    0, zone    DMA32, type   HighAtomic      0      0      0      0
     0      0      0      0      0      0      0
Node    0, zone    DMA32, type      Isolate      0      0      0      0
     0      0      0      0      0      0      0
Node    0, zone   Normal, type    Unmovable     39     36  13257   3474
  1333    317     42      0      0      0      0
Node    0, zone   Normal, type      Movable   1087   9678   1104   4250
  2391   1946   1768    691    141      0      0
Node    0, zone   Normal, type  Reclaimable      1   1782   1153   2455
  1927    986    330      7      2      0      0
Node    0, zone   Normal, type   HighAtomic      1      1      2      2
     2      0      1      1      1      0      0
Node    0, zone   Normal, type      Isolate      0      0      0      0
     0      0      0      0      0      0      0

Number of blocks type     Unmovable      Movable  Reclaimable
HighAtomic      Isolate
Node 0, zone      DMA            1            7            0
0            0
Node 0, zone    DMA32           52         1461           15
0            0
Node 0, zone   Normal          824         5448          383
1            0

> 2. Could you also try if the bad trend stops after you execute:
>  echo never > /sys/kernel/mm/transparent_hugepage/defrag
> and report the result?

it's pretty difficult to catch those moments. Is it OK so set the value
now and monitor if it happens again?

Just to let you know:
I've now also some more servers where memfree show 10-20Gb but cache
drops suddently and memory PSI raises.

Greets,
Stefan





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