| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | Abhijit Menon-Sen <ams(at)2ndquadrant(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: [PATCH] Use MAP_HUGETLB where supported (v3) |
| Date: | 2013-10-30 17:11:34 |
| Message-ID: | 20131030171134.GA22214@awork2.anarazel.de |
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| Lists: | pgsql-hackers |
On 2013-10-30 22:39:20 +0530, Abhijit Menon-Sen wrote:
> At 2013-10-30 11:04:36 -0400, tgl(at)sss(dot)pgh(dot)pa(dot)us wrote:
> >
> > > As a compromise, perhaps we can unconditionally round the size up to be
> > > a multiple of 2MB? […]
> >
> > That sounds reasonably painless to me.
>
> Here's a patch that does that and adds a DEBUG1 log message when we try
> with MAP_HUGETLB and fail and fallback to ordinary mmap.
But it's in no way guaranteed that the smallest hugepage size is
2MB. It'll be on current x86 hardware, but not on any other platform...
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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