On Tue 07-06-16 13:20:00, Michal Hocko wrote:

I guess you want something like posix_memalign or start faulting in from
an aligned address to guarantee you will fault 2MB pages. 

Good catch.

Besides that I am really suspicious that this will be measurable at all.
I would just go and spin a patch assuming you are still able to trigger
OOM with the vanilla kernel. 

Yes, I am still able to trigger OOM, the tests I did are  more like sanity
checks rather than benchmarks. lru_cache_add takes very little time
so it was rather to look for some unexpected side effects.

Thank,
Lukas

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