CODEWITHSUNDEEP
clinuxmmaphuge-pages
user14063792468
user14063792468

Reputation: 956

MAP_HUGETLB undefined

I want to test huge memory page allocation on Linux. Just to have another method up in the sleeve. But my test simply fails to compile.

pa = mmap(0, 1024*1024*2, PROT_READ, MAP_PRIVATE|MAP_HUGETLB, -1, 0)

Produces:

error: use of undeclared identifier 'MAP_HUGETLB'

Ideally I wish to mmap a file. But anonimous memory will also do.

The output from hugeadm --pool-list:

  Size      Minimum  Current  Maximum  Default
2097152     1024     1024     1024        *
1073741824  0        0        0

The question is, how could I allocate memory, backed by huge pages?

Upvotes: 1

Views: 967

Answers (1)

S.S. Anne
S.S. Anne

Reputation: 15566

You have to #define _GNU_SOURCE before #include <sys/mman.h> because this is a nonstandard flag.

Upvotes: 2

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