> yamt@mwd.biglobe.ne.jp (YAMAMOTO Takashi) writes:
>>> Also, I was under the impression that recent Linux kernels use hugepages
>>> automatically if they can, so I wonder exactly what Andres was testing
>>> on ...
>
>> if you mean the "trasparent hugepage" feature, iirc it doesn't affect
>> MAP_SHARED mappings like this.
>
> Oh! That would explain some things. It seems like a pretty nasty
> restriction though ... do you know why they did that?
i don't know. simply because it wasn't trivial, i guess.
the feature was implemented for kvm's guest memory, which is
non-shared anonymous memory from POV of host kernel.
YAMAMOTO Takashi
>
> regards, tom lane
>
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