Messages in this thread | | | Date | Mon, 9 Nov 2020 08:37:06 +0100 | From | Michal Hocko <> | Subject | Re: [PATCH] mm: introduce oom_kill_disable sysctl knob |
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On Fri 06-11-20 12:32:38, Minchan Kim wrote: > It's hard to have some tests to be supposed to work under heavy > memory pressure(e.g., injecting some memory hogger) because > out-of-memory killer easily kicks out one of processes so system > is broken or system loses the memory pressure state since it has > plenty of free memory soon so.
I do not follow the reasoning here. So you want to test for a close to no memory available situation and the oom killer stands in the way because it puts a relief?
> Even though we could mark existing process's oom_adj to -1000, > it couldn't cover upcoming processes to be forked for the job.
Why?
> This knob is handy to keep system memory pressure.
This sounds like a very dubious reason to introduce a knob to cripple the system.
I can see some reason to control the oom handling policy because the effect of the oom killer is really disruptive but a global on/off switch sounds like a too coarse interface. Really what kind of production environment would ever go with oom killer disabled completely?
-- Michal Hocko SUSE Labs
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