Re: transparent huge pages (was: Address bits again)

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Sujet : Re: transparent huge pages (was: Address bits again)
De : ldo (at) *nospam* nz.invalid (Lawrence D'Oliveiro)
Groupes : comp.arch
Date : 08. Sep 2024, 00:42:23
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vbiocv$1j26j$14@dont-email.me>
References : 1 2 3 4
User-Agent : Pan/0.160 (Toresk; )
On Thu, 05 Sep 2024 13:45:13 GMT, Anton Ertl wrote:

Recently, I thought that by using a 2MB size for an mmap()-allocated
memory block I would get THP on Linux.  Unfortunately, mmap() does not
aligng 2MB blocks to 2MB boundaries, and if it does not, the block is
not eligible for THP.

Checking the mmap(2) man page, I saw these:

   MAP_HUGETLB (since Linux 2.6.32)
          Allocate the mapping using "huge" pages. See the Linux
          kernel source file
          Documentation/ad‐min-guide/mm/hugetlbpage.rst for further
          information, as well as NOTES, below.

   MAP_HUGE_2MB
   MAP_HUGE_1GB (since Linux 3.8)
          Used in conjunction with MAP_HUGETLB to select
          alternative hugetlb page sizes (respectively, 2 MB and 1
          GB) on systems that support multiple hugetlb page sizes.

Did you try those flags?

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15 Aug 24 i`* Re: Article on new mainframe use123George Neuner
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17 Aug 24 i  i i+* Re: COBOL, Article on new mainframe use5Lawrence D'Oliveiro
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17 Aug 24 i  i ii`* Re: COBOL, Article on new mainframe use3Keith Thompson
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19 Aug 24 i  i i  i+- Re: COBOL, Article on new mainframe use1John Dallman
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23 Aug 24 i  i i  i `* Re: COBOL, Article on new mainframe use11Michael S
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27 Aug 24 i  i i  i    i`* Re: COBOL, Article on new mainframe use4Keith Thompson
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21 Aug 24 i  i i      `* Re: COBOL, Article on new mainframe use3MitchAlsup1
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29 Aug 24 i  i i  i  i`* Re: Article on new mainframe use69John Levine
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5 Sep 24 i  i i  i  i         ii+- Re: transparent huge pages1MitchAlsup1
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4 Sep 24 i  i i  i  i         `- Re: Address bits again, Article on new mainframe use1Lawrence D'Oliveiro
28 Aug 24 i  i i  i  `* Re: Article on new mainframe use2Lawrence D'Oliveiro
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15 Aug 24 i  `- Re: Article on new mainframe use1Thomas Koenig
15 Aug 24 `* Re: Article on new mainframe use7Lawrence D'Oliveiro

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