[DTrace-devel] [PATCH 4/5] test: Fix antiquated reference to dtrace_ustackdepth_max

[Kris Van Hees]

On Wed, Oct 01, 2025 at 02:24:17AM -0400, eugene.loh at oracle.com wrote:
> From: Eugene Loh <eugene.loh at oracle.com>
> 
> Signed-off-by: Eugene Loh <eugene.loh at oracle.com>

Reviewed-by: Kris Van Hees <kris.van.hees at oracle.com>

> ---
>  test/triggers/ustack-tst-bigstack.c | 12 ++++--------
>  1 file changed, 4 insertions(+), 8 deletions(-)
> 
> diff --git a/test/triggers/ustack-tst-bigstack.c b/test/triggers/ustack-tst-bigstack.c
> index e694a518c..267b07e74 100644
> --- a/test/triggers/ustack-tst-bigstack.c
> +++ b/test/triggers/ustack-tst-bigstack.c
> @@ -10,6 +10,10 @@
>  #include <unistd.h>
>  #include <sys/ioctl.h>
>  
> +/*
> + * Create a ridiculously large stack - enough to push us over
> + * the default setting of 'kernel.perf_event_max_stack' (127).
> + */
>  int limit = 4096;
>  
>  int grow1(int);
> @@ -23,14 +27,6 @@ shouldGrow(int frame)
>  int
>  grow(int frame)
>  {
> -	/*
> -	 * Create a ridiculously large stack - enough to push us over
> -	 * the default setting of 'dtrace_ustackdepth_max' (2048).
> -	 *
> -	 * This loop used to repeatedly call getpid(), but on Linux the result
> -	 * of that call gets cached, so that repeated calls actually do not
> -	 * trigger a system call anymore.  We use ioctl() instead.
> -	 */
>  	if (shouldGrow(frame))
>  		frame = grow1(frame++);
>  
> -- 
> 2.47.3
>