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Diffstat (limited to 'manual/tunables.texi')
| -rw-r--r-- | manual/tunables.texi | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/manual/tunables.texi b/manual/tunables.texi index 70dd2264c5..130f94b2bc 100644 --- a/manual/tunables.texi +++ b/manual/tunables.texi @@ -459,6 +459,21 @@ registration on behalf of the application. Restartable sequences are a Linux-specific extension. @end deftp +@deftp Tunable glibc.pthread.stack_hugetlb +This tunable controls whether to use Huge Pages in the stacks created by +@code{pthread_create}. This tunable only affects the stacks created by +@theglibc{}, it has no effect on stack assigned with +@code{pthread_attr_setstack}. + +The default is @samp{1} where the system default value is used. Setting +its value to @code{0} enables the use of @code{madvise} with +@code{MADV_NOHUGEPAGE} after stack creation with @code{mmap}. + +This is a memory utilization optimization, since internal glibc setup of either +the thread descriptor and the guard page might force the kernel to move the +thread stack originally backup by Huge Pages to default pages. +@end deftp + @node Hardware Capability Tunables @section Hardware Capability Tunables @cindex hardware capability tunables |