Re: huge tlb support

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: yamt(at)mwd(dot)biglobe(dot)ne(dot)jp (YAMAMOTO Takashi)
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 06:11:00
Message-ID: 677.1341814260@sss.pgh.pa.us
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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?

regards, tom lane

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