[Tarantool-patches] [PATCH 5/7] fiber: add dynamic option for parent backtrace

[Cyrill Gorcunov]

On Thu, Jul 01, 2021 at 11:24:43PM +0300, Egor Elchinov via Tarantool-patches wrote:
> diff --git a/src/lua/fiber.c b/src/lua/fiber.c
> index 026e30bc6..fe01ae23b 100644
> --- a/src/lua/fiber.c
> +++ b/src/lua/fiber.c
> @@ -205,7 +205,7 @@ struct lua_parent_tb_ctx {
>  	int tb_frame;
>  };
>  
> -#ifdef ENABLE_BACKTRACE
> +#if ENABLE_BACKTRACE

Please don't squash unrelated changes into the patch. If you prefer
to shange #ifdef to #if better make it as a separate commit (though
I don't understand yet what is wrong with existing code).

> @@ -446,15 +446,18 @@ lbox_fiber_statof_map(struct fiber *f, void *cb_ctx, bool backtrace)
>  				  f != fiber() ? &f->ctx : NULL, &tb_ctx);
>  		lua_settable(L, -3);
>  
> -		parent_tb_ctx.L = L;
> -		parent_tb_ctx.bt = f->storage.lua.parent_bt;
> -		parent_tb_ctx.tb_frame = 0;
> -		lua_pushstring(L, "backtrace_parent");
> -		lua_newtable(L);
> -		backtrace_foreach_ip(fiber_parent_backtrace_cb,
> -				     f->parent_bt_ip_buf,
> -				     FIBER_PARENT_BT_MAX, &parent_tb_ctx);
> -		lua_settable(L, -3);
> +		if (fiber_parent_bt_is_enabled()) {
> +			parent_tb_ctx.L = L;
> +			parent_tb_ctx.bt = f->storage.lua.parent_bt;
> +			parent_tb_ctx.tb_frame = 0;
> +			lua_pushstring(L, "backtrace_parent");
> +			lua_newtable(L);
> +			backtrace_foreach_ip(fiber_parent_backtrace_cb,
> +					     f->parent_bt_ip_buf,
> +					     FIBER_PARENT_BT_MAX, 
> +					     &parent_tb_ctx);
> +			lua_settable(L, -3);
> +		}

Maybe it would worth to merge fiber_parent_bt_is_enabled option immediately
into previous patch?