linux-kernel - Re: [PATCH v2 1/4] kernelshark: Adding infrastructure for GUI plugins

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Date:   Fri, 10 Nov 2017 09:23:36 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Yordan Karadzhov (VMware)" <y.karadz@...il.com>
Cc:     jan.kiszka@...mens.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] kernelshark: Adding infrastructure for GUI
 plugins

On Fri, 10 Nov 2017 14:29:12 +0200
"Yordan Karadzhov (VMware)" <y.karadz@...il.com> wrote:

> --- a/kernel-shark.c
> +++ b/kernel-shark.c
> @@ -339,6 +339,96 @@ int kernelshark_load_file(struct shark_info *info, const char *file)
>  	return 0;
>  }
>  
> +static struct plugin_list {
> +	struct plugin_list		*next;
> +	const char			*file;
> +} *plugins;
> +static struct plugin_list **plugin_next = &plugins;
> +
> +static void add_plugin(const char *file)
> +{
> +	struct stat st;
> +	int ret;
> +
> +	ret = stat(file, &st);
> +	if (ret < 0) {
> +		warning("plugin %s not found", file);
> +		return;
> +	}
> +
> +	*plugin_next = calloc(sizeof(struct plugin_list), 1);
> +	if (!*plugin_next) {
> +		warning("failed to allocat memory for plugin");
> +		return;
> +	}
> +
> +	(*plugin_next)->file = file;
> +	plugin_next = &(*plugin_next)->next;
> +}
> +
> +static void handle_plugins(struct shark_info *info,
> +			   struct trace_view_store *store,
> +			   int task_id)
> +{
> +	kshark_plugin_load_func func;
> +	struct plugin_list *plugin;
> +	void *handle;
> +	char* func_name;
> +	int fn_size = 0;
> +
> +	switch (task_id) {
> +		case KSHARK_PLUGIN_LOAD:
> +			fn_size = asprintf(&func_name, KSHARK_PLUGIN_LOADER_NAME);
> +			break;
> +
> +		case KSHARK_PLUGIN_RELOAD:
> +			fn_size = asprintf(&func_name, KSHARK_PLUGIN_RELOADER_NAME);
> +			break;
> +
> +		case KSHARK_PLUGIN_UNLOAD:
> +			fn_size = asprintf(&func_name, KSHARK_PLUGIN_UNLOADER_NAME);
> +			break;
> +
> +		default:
> +			return;
> +	}
> +
> +	if (fn_size <= 0) {
> +		warning("failed to allocat memory for plugin function name");
> +		return;
> +	}
> +
> +	for (plugin = plugins; plugin; plugin = plugin->next) {
> +		handle = dlopen(plugin->file, RTLD_NOW | RTLD_GLOBAL);
> +
> +		if (!handle) {
> +			warning("cound not load plugin '%s'\n%s\n",
> +				plugin->file, dlerror());
> +			continue;
> +		}
> +
> +		func = dlsym(handle, func_name);
> +		if (!func) {
> +			warning("cound not find func '%s' in plugin '%s'\n%s\n",
> +				func_name, plugin->file, dlerror());
> +			continue;
> +		}
> +
> +		func(info, store);
> +	}
> +
> +	if (task_id == KSHARK_PLUGIN_UNLOAD) {
> +		while ((plugin = plugins)) {
> +			plugins = plugin->next;
> +			free(plugin);
> +		}
> +
> +		plugin_next = &plugins;
> +	}
> +
> +	free(func_name);
> +}
> +

Break the move of the above functions into their own patch first, then
it is easier to see what changed here.

-- Steve

>  static void
>  /* Callback for the clicked signal of the Load button */
>  load_clicked (gpointer data)
> @@ -353,6 +443,9 @@ load_clicked (gpointer data)
>  
>  	kernelshark_load_file(info, filename);
>  
> +	GtkTreeModel *model = gtk_tree_view_get_model(GTK_TREE_VIEW(info->treeview));
> +	handle_plugins(info, TRACE_VIEW_STORE(model), KSHARK_PLUGIN_RELOAD);
> +
>  	g_free(filename);
>  }
>  
> @@ -1805,56 +1898,6 @@ button_press_event(GtkWidget *widget, GdkEventButton *event, gpointer data)
>  	return FALSE;
>  }
>  
> -static struct plugin_list {
> -	struct plugin_list		*next;
> -	const char			*file;
> -} *plugins;
> -static struct plugin_list **plugin_next = &plugins;
> -
> -static void add_plugin(const char *file)
> -{
> -	struct stat st;
> -	int ret;
> -
> -	ret = stat(file, &st);
> -	if (ret < 0) {
> -		warning("plugin %s not found", file);
> -		return;
> -	}
> -
> -	*plugin_next = calloc(sizeof(struct plugin_list), 1);
> -	if (!*plugin_next)
> -		die("failed to allocat memory for plugin");
> -
> -	(*plugin_next)->file = file;
> -	plugin_next = &(*plugin_next)->next;
> -}
> -
> -static void handle_plugins(struct shark_info *info)
> -{
> -	kshark_plugin_load_func func;
> -	struct plugin_list *plugin;
> -	void *handle;
> -
> -	while ((plugin = plugins)) {
> -		plugins = plugin->next;
> -
> -		handle = dlopen(plugin->file, RTLD_NOW | RTLD_GLOBAL);
> -		free(plugin);
> -		if (!handle) {
> -			warning("cound not load plugin '%s'\n%s\n",
> -				plugin->file, dlerror());
> -			continue;
> -		}
> -		func = dlsym(handle, KSHARK_PLUGIN_LOADER_NAME);
> -		if (!func) {
> -			warning("cound not find func '%s' in plugin '%s'\n%s\n",
> -				KSHARK_PLUGIN_LOADER_NAME, plugin->file, dlerror());
> -			continue;
> -		}
> -		func(info);
> -	}
> -}
>