| From: | yamt(at)mwd(dot)biglobe(dot)ne(dot)jp (YAMAMOTO Takashi) |
|---|---|
| To: | tgl(at)sss(dot)pgh(dot)pa(dot)us |
| Cc: | robertmhaas(at)gmail(dot)com, andres(at)2ndquadrant(dot)com, pgsql-hackers(at)postgresql(dot)org, josh(at)agliodbs(dot)com |
| Subject: | Re: huge tlb support |
| Date: | 2012-07-09 06:41:30 |
| Message-ID: | 20120709064130.CBEF114A17D@mail.netbsd.org |
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| Thread: | |
| Lists: | pgsql-hackers |
> yamt(at)mwd(dot)biglobe(dot)ne(dot)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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