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Diffstat (limited to 'manual/tunables.texi')
| -rw-r--r-- | manual/tunables.texi | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/manual/tunables.texi b/manual/tunables.texi index 7e8140199c..23ef0d40e7 100644 --- a/manual/tunables.texi +++ b/manual/tunables.texi @@ -250,6 +250,23 @@ increase the per-thread memory usage as necessary, so this tunable does not need to be changed to allow many audit modules e.g. via @env{LD_AUDIT}. @end deftp +@deftp Tunable glibc.rtld.optional_static_tls +Sets the amount of surplus static TLS in bytes to allocate at program +startup. Every thread created allocates this amount of specified surplus +static TLS. This is a minimum value and additional space may be allocated +for internal purposes including alignment. Optional static TLS is used for +optimizing dynamic TLS access for platforms that support such optimizations +e.g. TLS descriptors or optimized TLS access for POWER (@code{DT_PPC64_OPT} +and @code{DT_PPC_OPT}). In order to make the best use of such optimizations +the value should be as many bytes as would be required to hold all TLS +variables in all dynamic loaded shared libraries. The value cannot be known +by the dynamic loader because it doesn't know the expected set of shared +libraries which will be loaded. The existing static TLS space cannot be +changed once allocated at process startup. The default allocation of +optional static TLS is 512 bytes and is allocated in every thread. +@end deftp + + @node Elision Tunables @section Elision Tunables @cindex elision tunables |