Adhemerval Zanella b20b94006c
support: Skip malloc hugetlb={1,2} variants when kernel cannot honor them ...
The malloc test variants run with GLIBC_TUNABLES=glibc.malloc.hugetlb=1
exercise transparent huge pages via MADV_HUGEPAGE, which is only
meaningful when /sys/kernel/mm/transparent_hugepage/enabled is set to
'madvise' ('always' makes the madvise redundant and 'never' makes it
ineffective). The hugetlb=2 variants rely on MAP_HUGETLB, which
requires a positive /proc/sys/vm/nr_hugepages. On systems that do not
satisfy these prerequisites - including any non-Linux target - those
runs only consume CPU time in this case.
Add support/support_check_hugetlb.{c,h} exposing:
- support_thp_is_madvise: true iff THP is in 'madvise' mode;
- support_hugepages_reserved: true iff nr_hugepages > 0;
- support_check_malloc_hugetlb: inspects GLIBC_TUNABLES and calls
FAIL_UNSUPPORTED when the requested hugetlb mode cannot be honored.
Gate the check at compile time so only the variant binaries pay for
it.
Reviewed-by: DJ Delorie <dj@redhat.com >
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Adhemerval Zanella
b20b94006c