[PATCH] [act] UBUNTU: SAUCE: ubuntu_kernel_selftests: disable memory-hotplug

[Krzysztof Kozlowski]

On 23/06/2021 16:32, Paolo Pisati wrote:
> On Wed, Jun 23, 2021 at 3:24 PM Krzysztof Kozlowski
> <krzysztof.kozlowski at canonical.com
> <mailto:krzysztof.kozlowski at canonical.com>> wrote:
> 
> 
>     Why the filesystem fills up? Journald should have strict limits for its
>     logs... unless we keep logging it to a file and ignore any journald
>     MaxUse/KeepFree?
> 
> 
> /var/log/journald is about 1GB, the rest are kernel.log and syslog - 10G
> is the default openstack fs size:
> 
>  $ df -h /
> Filesystem      Size  Used Avail Use% Mounted on
> /dev/vda1       9.7G  9.7G     0 100% /
> 
> $ du -hx --max-depth=1 /
> 9.6G    /
> 5.3G    /var
> 2.2G    /usr
> 2.1G    /home
> ...
> 
> -rw-r----- 1 syslog adm  1948643300 Jun 23 09:01 /var/log/kern.log
> -rw-r----- 1 syslog adm  1949290433 Jun 23 14:12 /var/log/syslog

It's the old-syslog logging which can eat entire disk without any
self-control. :)

I understand the problem now and indeed disabling test makes sense.
However how about still keep it for few selected (always passing)
systems? This could be specific flavor/cloud with free disk space
constraint.

> 
> $ du -h --max-depth=1 /var/log/journal
> 970M    journal
> 
> $ tail -n10 /var/log/syslog
> Jun 23 09:00:21 ppisati-ppc64el-large kernel: [ 1293.949015] flags:
> 0x3ffff80000202a(referenced|dirty|active|private)
> Jun 23 09:00:21 ppisati-ppc64el-large kernel: [ 1293.949018] raw:
> 003ffff80000202a c00000000d657960 c00000000d657960 c00000000bb66068
> Jun 23 09:00:21 ppisati-ppc64el-large kernel: [ 1293.949020] raw:
> 0000000000008000 c00000001653c5d8 00000003ffffffff c00000000dc43000
> Jun 23 09:00:21 ppisati-ppc64el-large kernel: [ 1293.949022] page dumped
> because: migration failure
> Jun 23 09:00:21 ppisati-ppc64el-large kernel: [ 1293.949023] pages's
> memcg:c00000000dc43000
> Jun 23 09:00:21 ppisati-ppc64el-large kernel: [ 1293.949057] migrating
> pfn 179a failed ret:1
> Jun 23 09:00:21 ppisati-ppc64el-large kernel: [ 1293.949059]
> page:000000000f1e9b6f refcount:3 mapcount:0 mapping:00000000652d2e2f
> index:0x8000 pfn:0x179a
> Jun 23 09:00:21 ppisati-ppc64el-large kernel: [ 1293.949061]
> aops:def_blk_aops ino:fc00001
> Jun 23 09:00:21 ppisati-ppc64el-large kernel: [ 1293.949063] flags:
> 0x3ffff80000202a(referenced|dirty|active|private)
> Jun 23 09:00:21 ppisati-ppc64el-large kernel: [ 1293.949066] raw:
> 003ffff80000202a c00000000d657960 c00000000d657960 c00000000bb66068
> 


Best regards,
Krzysztof