On Thu, Mar 2, 2023 at 11:01 AM Jonas Schäfer <jonas@xxxxxxxxxxxxx> wrote: > > Hi there, > > By coincidence, I found this log message in my kernel logs: > > Mär 02 17:23:19 sinistra kernel: The swapaccount= commandline option is > deprecated. Please report your usecase to linux-mm@xxxxxxxxx if you depend on > this functionality. > > My usecase does depend on this in the following way: > > I use LXC extensively to isolate workloads from one another. Kind of like > docker, but with full operating systems inside. > > Before I found out about swapaccount, I often ran into the issue that one > misbehaving workload from one of those containers would bring the entire > machine to a halt because it occupied lots of swap, and thus triggered > significant slowdown. > > With swapaccount, I limit swap to about 10% of the RAM assigned to the > containers. This allows them to swap out unused stuff, but invokes the OOM > killer before any significant slowdown happens. > > The alternative would be to turn off swap for the system entirely, but it is > running fairly efficiently thanks to swapping stuff out. > > I'd be interested to hear about alternatives. > > Thanks for hearing me, anyway. If I understand correctly you were setting swapaccount=1, right? IIRC, swapaccount= was deprecated in the sense that it is always on now (i.e you cannot set swapaccount=0). > > kind regards, > Jonas Schäfer
