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malloc: Enable huge page support on main arena

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This patch adds support huge page support on main arena allocation,
enable with tunable glibc.malloc.hugetlb=2.  The patch essentially
disable the __glibc_morecore() sbrk() call (similar when memory
tag does when sbrk() call does not support it) and fallback to
default page size if the memory allocation fails.

Checked on x86_64-linux-gnu.

Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Adhemerval Zanella
2021-08-30 14:01:00 -03:00
parent 0849eed45d
commit 0f982c1827
3 changed files with 14 additions and 6 deletions
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12
malloc/malloc.c
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@ -2741,8 +2741,16 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
segregated mmap region.
*/
char *mbrk = sysmalloc_mmap_fallback (&size, nb, old_size, pagesize,
MMAP_AS_MORECORE_SIZE, 0, av);
char *mbrk = MAP_FAILED;
#if HAVE_TUNABLES
if (mp_.hp_pagesize > 0)
mbrk = sysmalloc_mmap_fallback (&size, nb, old_size,
mp_.hp_pagesize, mp_.hp_pagesize,
mp_.hp_flags, av);
#endif
if (mbrk == MAP_FAILED)
mbrk = sysmalloc_mmap_fallback (&size, nb, old_size, pagesize,
MMAP_AS_MORECORE_SIZE, 0, av);
if (mbrk != MAP_FAILED)
{
/* We do not need, and cannot use, another sbrk call to find end */