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From: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
To: Vlastimil Babka <vbabka@suse.cz>, Michal Hocko <mhocko@kernel.org>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>,
	l.roehrs@profihost.ag, cgroups@vger.kernel.org,
	Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: lot of MemAvailable but falling cache and raising PSI
Date: Mon, 9 Sep 2019 14:09:09 +0200
Message-ID: <3ca34a49-6327-e6fd-2754-9b0700d87785@profihost.ag> (raw)
In-Reply-To: <b45eb4d9-b1ed-8637-84fa-2435ac285dde@suse.cz>


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


  reply index

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-05 11:27 Stefan Priebe - Profihost AG
2019-09-05 11:40 ` Michal Hocko
2019-09-05 11:56   ` Stefan Priebe - Profihost AG
2019-09-05 16:28     ` Yang Shi
2019-09-05 17:26       ` Stefan Priebe - Profihost AG
2019-09-05 18:46         ` Yang Shi
2019-09-05 19:31           ` Stefan Priebe - Profihost AG
2019-09-06 10:08     ` Stefan Priebe - Profihost AG
2019-09-06 10:25       ` Vlastimil Babka
2019-09-06 18:52       ` Yang Shi
2019-09-07  7:32         ` Stefan Priebe - Profihost AG
2019-09-09  8:27       ` Michal Hocko
2019-09-09  8:54         ` Stefan Priebe - Profihost AG
2019-09-09 11:01           ` Michal Hocko
2019-09-09 12:08             ` Michal Hocko
2019-09-09 12:10               ` Stefan Priebe - Profihost AG
2019-09-09 12:28                 ` Michal Hocko
2019-09-09 12:37                   ` Stefan Priebe - Profihost AG
2019-09-09 12:49                     ` Michal Hocko
2019-09-09 12:56                       ` Stefan Priebe - Profihost AG
     [not found]                         ` <52235eda-ffe2-721c-7ad7-575048e2d29d@profihost.ag>
2019-09-10  5:58                           ` Stefan Priebe - Profihost AG
2019-09-10  8:29                           ` Michal Hocko
2019-09-10  8:38                             ` Stefan Priebe - Profihost AG
2019-09-10  9:02                               ` Michal Hocko
2019-09-10  9:37                                 ` Stefan Priebe - Profihost AG
2019-09-10 11:07                                   ` Michal Hocko
2019-09-10 12:45                                     ` Stefan Priebe - Profihost AG
2019-09-10 12:57                                       ` Michal Hocko
2019-09-10 13:05                                         ` Stefan Priebe - Profihost AG
2019-09-10 13:14                                           ` Stefan Priebe - Profihost AG
2019-09-10 13:24                                             ` Michal Hocko
2019-09-11  6:12                                               ` Stefan Priebe - Profihost AG
2019-09-11  6:24                                                 ` Stefan Priebe - Profihost AG
2019-09-11 13:59                                                   ` Stefan Priebe - Profihost AG
2019-09-12 10:53                                                     ` Stefan Priebe - Profihost AG
2019-09-12 11:06                                                       ` Stefan Priebe - Profihost AG
2019-09-11  7:09                                                 ` 5.3-rc-8 hung task in IO (was: Re: lot of MemAvailable but falling cache and raising PSI) Michal Hocko
2019-09-11 14:09                                                   ` Stefan Priebe - Profihost AG
2019-09-11 14:56                                                   ` Filipe Manana
2019-09-11 15:39                                                     ` Stefan Priebe - Profihost AG
2019-09-11 15:56                                                       ` Filipe Manana
2019-09-11 16:15                                                         ` Stefan Priebe - Profihost AG
2019-09-11 16:19                                                           ` Filipe Manana
2019-09-19 10:21                                                 ` lot of MemAvailable but falling cache and raising PSI Stefan Priebe - Profihost AG
2019-09-23 12:08                                                   ` Michal Hocko
2019-09-27 12:45                                                   ` Vlastimil Babka
2019-09-30  6:56                                                     ` Stefan Priebe - Profihost AG
2019-09-30  7:21                                                       ` Vlastimil Babka
2019-10-22  7:41                                                     ` Stefan Priebe - Profihost AG
2019-10-22  7:48                                                       ` Vlastimil Babka
2019-10-22 10:02                                                         ` Stefan Priebe - Profihost AG
2019-10-22 10:20                                                           ` Oscar Salvador
2019-10-22 10:21                                                           ` Vlastimil Babka
2019-10-22 11:08                                                             ` Stefan Priebe - Profihost AG
2019-09-10  5:41                       ` Stefan Priebe - Profihost AG
2019-09-09 11:49           ` Vlastimil Babka
2019-09-09 12:09             ` Stefan Priebe - Profihost AG [this message]
2019-09-09 12:21               ` Vlastimil Babka
2019-09-09 12:31                 ` Stefan Priebe - Profihost AG
2019-09-05 12:15 ` Vlastimil Babka
2019-09-05 12:27   ` Stefan Priebe - Profihost AG

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