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| author | Cupertino Miranda <cupertino.miranda@oracle.com> | 2023-04-14 16:12:20 +0100 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-04-20 13:54:24 -0300 |
| commit | b630be0922dbaaa50eb174a7740f0d3fb88602da (patch) | |
| tree | fa0e6bd1ef8115117c6a2090b2dd5248269609fb /nptl/allocatestack.c | |
| parent | 0f61cd4b9c5175c128311769df932c8d7694d6b6 (diff) | |
| download | glibc-b630be0922dbaaa50eb174a7740f0d3fb88602da.tar glibc-b630be0922dbaaa50eb174a7740f0d3fb88602da.tar.gz glibc-b630be0922dbaaa50eb174a7740f0d3fb88602da.tar.bz2 glibc-b630be0922dbaaa50eb174a7740f0d3fb88602da.zip | |
Created tunable to force small pages on stack allocation.
Created tunable glibc.pthread.stack_hugetlb to control when hugepages
can be used for stack allocation.
In case THP are enabled and glibc.pthread.stack_hugetlb is set to
0, glibc will madvise the kernel not to use allow hugepages for stack
allocations.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'nptl/allocatestack.c')
| -rw-r--r-- | nptl/allocatestack.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/nptl/allocatestack.c b/nptl/allocatestack.c index c7adbccd6f..f9d8cdfd08 100644 --- a/nptl/allocatestack.c +++ b/nptl/allocatestack.c @@ -369,6 +369,12 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp, if (__glibc_unlikely (mem == MAP_FAILED)) return errno; + /* Do madvise in case the tunable glibc.pthread.stack_hugetlb is + set to 0, disabling hugetlb. */ + if (__glibc_unlikely (__nptl_stack_hugetlb == 0) + && __madvise (mem, size, MADV_NOHUGEPAGE) != 0) + return errno; + /* SIZE is guaranteed to be greater than zero. So we can never get a null pointer back from mmap. */ assert (mem != NULL); |