> Robert Haas <robertmhaas@gmail.com> writes:
>> On Fri, Jun 29, 2012 at 3:52 PM, Andres Freund <andres@2ndquadrant.com> wrote:
>>> In a *very* quick patch I tested using huge pages/MAP_HUGETLB for the mmap'ed
>>> memory.
>
>> So, considering that there is required setup, it seems that the
>> obvious thing to do here is add a GUC: huge_tlb_pages (boolean).
>
>> The other alternative is to try with MAP_HUGETLB and, if it fails, try
>> again without MAP_HUGETLB.
>
> +1 for not making people configure this manually.
>
> 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.
YAMAMOTO Takashi
>
> regards, tom lane
>
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