nptl: Add glibc.pthread.stack_cache_size tunable

The valgrind/helgrind test suite needs a way to make stack dealloction
more prompt, and this feature seems to be generally useful.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/sysdeps/nptl/dl-tunables.list b/sysdeps/nptl/dl-tunables.list
index e3f6432e60..ac5d053298 100644
--- a/sysdeps/nptl/dl-tunables.list
+++ b/sysdeps/nptl/dl-tunables.list
@@ -23,5 +23,9 @@ glibc {
       maxval: 32767
       default: 100
     }
+    stack_cache_size {
+      type: SIZE_T
+      default: 41943040
+    }
   }
 }