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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-08-30 14:01:00 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-12-15 17:35:39 -0300 |
| commit | 0f982c182760bd7689769ee7590df592d0a132c0 (patch) | |
| tree | f538197b6d1f3d2bd4eda217fccb4c824d3b5929 /malloc/arena.c | |
| parent | 0849eed45daabf30a02c153695041597d6d43b2d (diff) | |
| download | glibc-0f982c182760bd7689769ee7590df592d0a132c0.tar.gz glibc-0f982c182760bd7689769ee7590df592d0a132c0.tar.xz glibc-0f982c182760bd7689769ee7590df592d0a132c0.zip | |
malloc: Enable huge page support on main arena
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>
Diffstat (limited to 'malloc/arena.c')
| -rw-r--r-- | malloc/arena.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/malloc/arena.c b/malloc/arena.c index e1852f8597..3ed4ef3f05 100644 --- a/malloc/arena.c +++ b/malloc/arena.c @@ -364,6 +364,10 @@ ptmalloc_init (void) # endif TUNABLE_GET (mxfast, size_t, TUNABLE_CALLBACK (set_mxfast)); TUNABLE_GET (hugetlb, size_t, TUNABLE_CALLBACK (set_hugetlb)); + if (mp_.hp_pagesize > 0) + /* Force mmap for main arena instead of sbrk, so hugepages are explicitly + used. */ + __always_fail_morecore = true; #else if (__glibc_likely (_environ != NULL)) { |