[LTP] [PATCH] Fix tst_pollute_memory() safety margin for huge systems

[Li Wang]

On Wed, Jan 27, 2021 at 8:27 PM Cyril Hrubis <chrubis@suse.cz> wrote:

> Hi!
> > According my test,malloc amount greater than available memory,then
> invoke the oom-killer.
>
> However that does not mean that allocating MemAvailable or slightly less
> than MemAvailable is safe. In fact it's not, at least that I've been
> told be kernel developers. I will try to figure out something safe
> enough with their help.
>

If we only hope to avoid trigger OOM during allocating until the
MAP_FAILED, I think the knob 'proc/sys/vm/overcommit_memory'
maybe helpful.

e.g.

  set overcommit_memory = 2, overcommit_ratio = 85 or 90;
  ... memory allocating as much as you can ...
  restore the value of overcommit_*

-- 
Regards,
Li Wang
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