It's 2015, and OOM handling still sucks

[Neal Becker]

Ian Malone wrote:

> On 1 December 2015 at 15:19, Neal Becker <ndbecker2 at gmail.com> wrote:
>> I have a pretty nice workstation, with 8 cores and 32G RAM.
>>
>> A stupid little python program just killed it by consuming all the
>> memory, driving it into swapping hell.
>>
>> I couldn't even ssh into it - I started up ssh and went for coffee.  On
>> return I still didn't have a prompt.  Had to power cycle it.
>>
>> This is F23, everything is setup default regarding kernel memory
>> policies, etc.
>>
>> So, can we configure things to give a better experience?  Can we make
>> this default?
>>
> 
> Maybe one for the devel list where they can do something about it. I
> haven't actually checked what the current Fedora policies are, since
> at work I use RHEL. I'd have thought the oom killer would get this.
> Really taking out all the memory with no swap available seems more
> likely to kill a system, possibly memory use can expand too fast, but
> on systems with some swap I've rarely seen things get to the point you
> can't get a virtual terminal up.
> cat /proc/meminfo 
MemTotal:       32902244 kB
MemFree:        24712892 kB
MemAvailable:   28580148 kB
Buffers:            2996 kB
Cached:          3769828 kB
SwapCached:            0 kB
Active:          5229044 kB
Inactive:        2420832 kB
Active(anon):    3878352 kB
Inactive(anon):    36628 kB
Active(file):    1350692 kB
Inactive(file):  2384204 kB
Unevictable:          16 kB
Mlocked:              16 kB
SwapTotal:      16400376 kB
SwapFree:       16400376 kB
Dirty:                 0 kB
Writeback:             0 kB
AnonPages:       3877468 kB
Mapped:           307056 kB
Shmem:             37928 kB
Slab:             295500 kB
SReclaimable:     218208 kB
SUnreclaim:        77292 kB
KernelStack:        9264 kB
PageTables:        41680 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    32851496 kB
Committed_AS:    6566200 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      190544 kB
VmallocChunk:   34359531516 kB
HardwareCorrupted:     0 kB
AnonHugePages:         0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:      194712 kB
DirectMap2M:     6053888 kB
DirectMap1G:    28311552 kB