| From: | Peter Eisentraut <peter(at)eisentraut(dot)org> |
|---|---|
| To: | Dmitry Dolgov <9erthalion6(at)gmail(dot)com> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Changing shared_buffers without restart |
| Date: | 2024-11-21 07:55:40 |
| Message-ID: | cadf4502-a808-4840-872f-589b66eba538@eisentraut.org |
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| Thread: | |
| Lists: | pgsql-hackers |
On 19.11.24 14:29, Dmitry Dolgov wrote:
>> I see that memfd_create() has a MFD_HUGETLB flag. It's not very clear how
>> that interacts with the MAP_HUGETLB flag for mmap(). Do you need to specify
>> both of them if you want huge pages?
> Correct, both (one flag in memfd_create and one for mmap) are needed to
> use huge pages.
I was worried because the FreeBSD man page says
MFD_HUGETLB This flag is currently unsupported.
It looks like FreeBSD doesn't have MAP_HUGETLB, so maybe this is irrelevant.
But you should make sure in your patch that the right set of flags for
huge pages is passed.
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