On Tue, Jul 10, 2018 at 02:32:22PM +0200, Michal Hocko <mhocko@xxxxxxxxxx> wrote:
> then we are out of luck. It is quite unfortunate that nvidia really
> insists on having order-3 allocation. Maybe it can use kvmalloc or use
> __GFP_RETRY_MAYFAIL in current kernels.
Please note that nvidia is really just one of many causes. For example,
right now, on one of our company servers with 25GB of available RAM and
no nvidia driver on linux 4.14.43, I couldn't start any kvm until I did a
manual cache flush:
~# vmctl start ...
ioctl(KVM_CREATE_VM) failed: 12 Cannot allocate memory
failed to initialize KVM: Cannot allocate memory
~# free
total used free shared buff/cache available
Mem: 32619348 6712028 989540 21652 24917780 25430736
Swap: 33554428 249676 33304752
~# sync; echo 3 >/proc/sys/vm/drop_caches
~# vmctl start ...
[successful]
reason was an order-6 allocation by kvm:
http://data.plan9.de/kvm_oom.txt
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