diff --git a/main.rkt b/main.rkt
index 1be7cee..7449c53 100644
--- a/main.rkt
+++ b/main.rkt
@@ -10,4 +10,6 @@
                        "private/wv-dialog.rkt"
                        )
          webview-set-loglevel
+         webview-version
+         webview-info
          )
diff --git a/private/lib/windows/x86_64/rktwebview.dll b/private/lib/windows/x86_64/rktwebview.dll
index 3db76d5..86416e8 100644
Binary files a/private/lib/windows/x86_64/rktwebview.dll and b/private/lib/windows/x86_64/rktwebview.dll differ
diff --git a/private/lib/windows/x86_64/rktwebview_prg.exe b/private/lib/windows/x86_64/rktwebview_prg.exe
index 59331da..6fa294d 100644
Binary files a/private/lib/windows/x86_64/rktwebview_prg.exe and b/private/lib/windows/x86_64/rktwebview_prg.exe differ
diff --git a/private/lib/windows/x86_64/rktwebview_test.exe b/private/lib/windows/x86_64/rktwebview_test.exe
index 5041230..e260078 100644
Binary files a/private/lib/windows/x86_64/rktwebview_test.exe and b/private/lib/windows/x86_64/rktwebview_test.exe differ
diff --git a/private/racket-webview-qt.rkt b/private/racket-webview-qt.rkt
index ac3113a..74cd743 100644
--- a/private/racket-webview-qt.rkt
+++ b/private/racket-webview-qt.rkt
@@ -45,6 +45,7 @@
          rkt-webview-messagebox
          rkt-webview-version
          rkt-webview-set-loglevel
+         rkt-webview-info
          )
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -243,6 +244,7 @@
   (_enum '(version = -1
            event = 2
            js-result = 3
+           metrics = 4
            )
          )
   )
@@ -267,6 +269,20 @@
    )
   )
 
+(define-cstruct _rkt_metrics_t
+  ([shm_usage _int]
+   [shm_free_depth _int]
+   [shm_free_size _int]
+   [shm_item_depth _int]
+   [shm_item_size _int]
+   [shm_item_usage_factor _double]
+   [open_windows _int]
+   [function_calls _int]
+   [events _int]
+   [log_file _string*/utf-8]
+   )
+  )
+
 (define-cstruct _rkt_evt_t
   ([w _int]
    [evt _pointer]
@@ -279,7 +295,7 @@
 
 (define-cstruct _rkt_data_t
   ([kind _rkt_data_kind]
-   [data (_union _rkt_version_t _rkt_evt_t _rkt_js_result_t)]
+   [data (_union _rkt_version_t _rkt_evt_t _rkt_js_result_t _rkt_metrics_t)]
    )
   )
 
@@ -299,6 +315,10 @@
 (define-rktwebview rkt_webview_set_loglevel
   (_fun _rkt_loglevel_t -> _void))
 
+;RKTWEBVIEW_EXPORT rkt_data_t *rkt_webview_info();
+(define-rktwebview rkt_webview_info
+  (_fun -> _rkt_data_t-pointer/null))
+
 ;RKTWEBVIEW_EXPORT int rkt_webview_events_waiting();
 (define-rktwebview rkt_webview_events_waiting
   (_fun -> _int))
@@ -595,6 +615,22 @@
 (define (rkt-webview-set-loglevel l)
   (rkt_webview_set_loglevel l))
 
+(define (rkt-webview-info)
+  (let* ((d (rkt_webview_info))
+         (r (union-ref (rkt_data_t-data d) 3))
+         )
+   (let ((res 
+          (list (list 'shm-usage (rkt_metrics_t-shm_usage r))
+                (list 'shm-freelist (rkt_metrics_t-shm_free_depth r) (rkt_metrics_t-shm_free_size r))
+                (list 'shm-alloc (rkt_metrics_t-shm_item_depth r) (rkt_metrics_t-shm_item_size r) (rkt_metrics_t-shm_item_usage_factor r))
+                (list 'open-windows (rkt_metrics_t-open_windows r))
+                (list 'calls (rkt_metrics_t-function_calls r))
+                (list 'events (rkt_metrics_t-events r))
+                (list 'log-file (rkt_metrics_t-log_file r))
+                )))
+     (rkt_webview_free_data d)
+     res)))
+
 (define (rkt-webview-set-ou-token handle token)
   (rkt_webview_set_ou_token (rkt-wv-win handle) token)
   #t)
diff --git a/private/racket-webview.rkt b/private/racket-webview.rkt
index 7d3a17a..5ae9181 100644
--- a/private/racket-webview.rkt
+++ b/private/racket-webview.rkt
@@ -107,6 +107,7 @@
          webview-default-boilerplate-js
 
          webview-version
+         webview-info
 
          wv-context-base-url
          wv-win-window-nr
@@ -954,6 +955,9 @@
   (cons (list 'webview webview-major webview-minor webview-patch)
         (rkt-webview-version)))
 
+(define (webview-info)
+  (rkt-webview-info))
+
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; testing
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
diff --git a/rktwebview_qt/main.cpp b/rktwebview_qt/main.cpp
index aac9b19..fa81e6a 100644
--- a/rktwebview_qt/main.cpp
+++ b/rktwebview_qt/main.cpp
@@ -15,17 +15,7 @@
 
 static void free_data(rkt_data_t *d)
 {
-    if (d->kind == version) {
-        free(d);
-    } else if (d->kind == event) {
-        free(d->data.event.event);
-        free(d);
-    } else if (d->kind == js_result) {
-        free(d->data.js_result.value);
-        free(d);
-    } else {
-        ERROR1("UNEXPECTED: data kind %d cannot be freed\n", d->kind);
-    }
+    do_free_data(d);
 }
 
 class Handler : public QThread
@@ -142,6 +132,11 @@ void Handler::run()
                 quit = true;
             }
             break;
+            case CMD_INFO: {
+                int open_windows = webview_handler->openWindows();
+                result_queue->enqueue(open_windows);
+            }
+            break;
             case CMD_HANDLE_IS_VALID: {
                 int wv = data_obj["wv"].toInt();
                 bool oke = webview_handler->rktValid(wv);
diff --git a/rktwebview_qt/rkt_protocol.h b/rktwebview_qt/rkt_protocol.h
index 663bbc3..b1c3082 100644
--- a/rktwebview_qt/rkt_protocol.h
+++ b/rktwebview_qt/rkt_protocol.h
@@ -27,6 +27,7 @@
 #define CMD_SET_OU_TOKEN   24       // arguments: wv: int, token: string -> result_t: int
 #define CMD_MSG_BOX        25       // arguments: wv: int, title:string, message: string, submessage: string, type:int -> result_t: int
 #define CMD_SET_LOGLEVEL   26       // arguments: ll: int
+#define CMD_INFO           27       // arguments: none
 
 #define RESULT_QUIT     36379
 
diff --git a/rktwebview_qt/rktwebview.cpp b/rktwebview_qt/rktwebview.cpp
index cb267f1..983593e 100644
--- a/rktwebview_qt/rktwebview.cpp
+++ b/rktwebview_qt/rktwebview.cpp
@@ -48,6 +48,9 @@ typedef struct {
 
     bool rkt_webview_prg_started;
     bool valid;
+    int  function_calls;
+    int  events;
+    std::string log_file;
 } Handle_t;
 
 Handle_t *handler = nullptr;
@@ -98,6 +101,7 @@ bool runRktWebview(Handle_t *handler)
     if (td == nullptr) { td = "C:\\"; }
     std::string tmpdir = td;
     std::string logfile = tmpdir + "\\" + "rktwebview.log"; //handler->name + ".log";
+    handler->log_file = logfile;
 
     SECURITY_ATTRIBUTES sa;
     sa.nLength = sizeof(sa);
@@ -105,10 +109,10 @@ bool runRktWebview(Handle_t *handler)
     sa.bInheritHandle = TRUE;
 
     HANDLE h = CreateFile(logfile.c_str(),
-                          0, //FILE_APPEND_DATA,
+                          FILE_WRITE_DATA, //FILE_APPEND_DATA,
                           FILE_SHARE_WRITE | FILE_SHARE_READ,
                           &sa,
-                          OPEN_ALWAYS,
+                          CREATE_ALWAYS,
                           FILE_ATTRIBUTE_NORMAL,
                           NULL);
 
@@ -145,6 +149,7 @@ bool runRktWebview(Handle_t *handler)
     const char *homedir = pw->pw_dir;
 
     std::string log_file = std::string(homedir) + "/.racket-webview.log";
+    handler->log_file = log_file;
 
     posix_spawn_file_actions_t action;
     posix_spawn_file_actions_init(&action);
@@ -174,25 +179,6 @@ void rkt_webview_cleanup()
         // So we would need to cleanup at exit of racket/drracket.
         // Cleaning up when exiting the current custodian is not enough.
 
-        /*
-        QApplication *app = handler->app();
-        if (app != nullptr) {
-            // testing with #:custodian (current-custodian)
-            QTimer t;
-            QObject::connect(&t, &QTimer::timeout, app, [app]() {
-                fprintf(stderr, "Quitting\n");
-                app->quit();
-            });
-            t.setSingleShot(true);
-            t.start(250);
-            fprintf(stderr, "Executing app\n");
-            app->exec();
-            fprintf(stderr, "App exited\n");
-            delete handler;
-            handler = nullptr;
-        }
-        */
-
         if (handler->valid) {
             INFO0("Sending quit message\n");
             handler->command_queue->enqueue(CMD_QUIT);
@@ -240,6 +226,8 @@ void rkt_webview_init()
         handler = new Handle_t;
         handler->valid = true;
         handler->name = buf;
+        handler->function_calls = 0;
+        handler->events = 0;
 
         handler->shm_size = SHM_SIZE;
         handler->shm = new Shm(handler->name.data(), handler->shm_size, true);
@@ -253,6 +241,8 @@ void rkt_webview_init()
         handler->rkt_webview_prg_started = runRktWebview(handler);
         if (!handler->rkt_webview_prg_started) { handler->valid = false; }
 #endif
+    } else {
+        handler->function_calls++;
     }
 }
 
@@ -280,6 +270,7 @@ static inline bool validHandle()
 #define FAIL_WV if (!validHandle()) { return 0; }
 #define NOOP_HANDLE if (!validHandle()) { return; }
 #define FAIL_CALL_JS if (!validHandle()) { return nullptr; }
+#define FAIL_INFO FAIL_CALL_JS
 
 rkt_wv_context_t rkt_webview_new_context(const char *boilerplate_js, const char *optional_server_cert_pem)
 {
@@ -512,19 +503,7 @@ void rkt_webview_set_ou_token(rktwebview_t wv, const char *token)
 
 void rkt_webview_free_data(rkt_data_t *d)
 {
-    if (d == nullptr) { return; }
-
-    if (d->kind == version) {
-        free(d);
-    } else if (d->kind == event) {
-        free(d->data.event.event);
-        free(d);
-    } else if (d->kind == js_result) {
-        free(d->data.js_result.value);
-        free(d);
-    } else {
-        ERROR1("UNEXPECTED: data kind %d cannot be freed\n", d->kind);
-    }
+    do_free_data(d);
 }
 
 rkt_data_t *rkt_webview_version()
@@ -557,6 +536,7 @@ rkt_data_t *rkt_webview_get_event()
         rkt_data_t *d = reinterpret_cast<rkt_data_t *>(malloc(sizeof(rkt_data_t)));
         d->kind = rkt_data_kind_t::event;
 
+        handler->events += 1;
         size_t ds = data.size();
         d->data.event.event = reinterpret_cast<char *>(malloc(ds + 1));
         memcpy(d->data.event.event, data.c_str(), ds);
@@ -581,3 +561,33 @@ void rkt_webview_env(const char *env_cmds[])
     }
 }
 
+
+rkt_data_t *rkt_webview_info()
+{
+    rkt_webview_init();
+    FAIL_INFO
+
+    rkt_data_t *d = new rkt_data_t();
+    d->kind = metrics;
+
+    handler->shm->info(d->data.metrics.shm_usage,
+                       d->data.metrics.shm_free_depth,
+                       d->data.metrics.shm_free_size,
+                       d->data.metrics.shm_item_depth,
+                       d->data.metrics.shm_item_size,
+                       d->data.metrics.shm_item_usage_factor);
+
+    JSON j;
+    handler->command_queue->enqueue(CMD_INFO, j.dump());
+
+    int open_windows_result;
+    std::string none;
+    handler->command_result_queue->dequeue(open_windows_result, none, true);
+
+    d->data.metrics.open_windows = open_windows_result;
+    d->data.metrics.function_calls = handler->function_calls;
+    d->data.metrics.log_file = strdup(handler->log_file.c_str());
+    d->data.metrics.events = handler->events + handler->event_queue->depth();
+
+    return d;
+}
diff --git a/rktwebview_qt/rktwebview.h b/rktwebview_qt/rktwebview.h
index c969e5f..0fd9da7 100644
--- a/rktwebview_qt/rktwebview.h
+++ b/rktwebview_qt/rktwebview.h
@@ -14,7 +14,7 @@ RKTWEBVIEW_EXPORT void rkt_webview_env(const char *env_cmds[]);
 RKTWEBVIEW_EXPORT void rkt_webview_init();
 RKTWEBVIEW_EXPORT void rkt_webview_cleanup();
 RKTWEBVIEW_EXPORT void rkt_webview_set_loglevel(rkt_webview_loglevel_t l);
-//RKTWEBVIEW_EXPORT void rkt_webview_process_events(int for_ms);
+RKTWEBVIEW_EXPORT rkt_data_t *rkt_webview_info();
 
 RKTWEBVIEW_EXPORT void rkt_webview_free_data(rkt_data_t *d);
 RKTWEBVIEW_EXPORT rkt_data_t *rkt_webview_version();
diff --git a/rktwebview_qt/rktwebview_qt.cpp b/rktwebview_qt/rktwebview_qt.cpp
index 04ecaeb..64044ac 100644
--- a/rktwebview_qt/rktwebview_qt.cpp
+++ b/rktwebview_qt/rktwebview_qt.cpp
@@ -147,7 +147,7 @@ void Rktwebview_qt::processCommand(Command *cmd)
 
             w->show();
             while(!w->windowCreated()) {
-                doEvents();
+                _app->processEvents();
             }
 
             cmd->result = id;
@@ -156,7 +156,6 @@ void Rktwebview_qt::processCommand(Command *cmd)
     }
     break;
     case COMMAND_CLOSE: {
-        doEvents();
         int wv = cmd->args[0].toInt();
         if (_views.contains(wv)) {
             WebviewWindow *w= _views[wv];
@@ -164,7 +163,7 @@ void Rktwebview_qt::processCommand(Command *cmd)
             w->closeView();
             cmd->result = true;
             while(w->isVisible()) {
-                doEvents();
+                _app->processEvents();
             }
             _view_js_callbacks.remove(wv);
             delete w;
@@ -175,7 +174,6 @@ void Rktwebview_qt::processCommand(Command *cmd)
     }
     break;
     case COMMAND_SET_OU_TOKEN: {
-        doEvents();
         int wv = cmd->args[0].toInt();
         QString ou_token = cmd->args[1].toString();
         if (_views.contains(wv)) {
@@ -189,7 +187,6 @@ void Rktwebview_qt::processCommand(Command *cmd)
     }
     break;
     case COMMAND_SET_URL: {
-        doEvents();
         int wv = cmd->args[0].toInt();
         QString url = cmd->args[1].toString();
         if (_views.contains(wv)) {
@@ -205,7 +202,6 @@ void Rktwebview_qt::processCommand(Command *cmd)
     }
     break;
     case COMMAND_SET_HTML: {
-        doEvents();
         int wv = cmd->args[0].toInt();
         QString html = cmd->args[1].toString();
         if (_views.contains(wv)) {
@@ -220,7 +216,6 @@ void Rktwebview_qt::processCommand(Command *cmd)
     }
     break;
     case COMMAND_SET_TITLE: {
-        doEvents();
         int wv = cmd->args[0].toInt();
         QString title = cmd->args[1].toString();
         if (_views.contains(wv)) {
@@ -234,7 +229,6 @@ void Rktwebview_qt::processCommand(Command *cmd)
     }
     break;
     case COMMAND_RUN_JS: {
-        doEvents();
         int wv = cmd->args[0].toInt();
         QString js = cmd->args[1].toString();
         if (_views.contains(wv)) {
@@ -249,7 +243,6 @@ void Rktwebview_qt::processCommand(Command *cmd)
     }
     break;
     case COMMAND_CALL_JS: {
-        doEvents();
         int wv = cmd->args[0].toInt();
         QString js = cmd->args[1].toString();
         if (_views.contains(wv)) {
@@ -263,7 +256,6 @@ void Rktwebview_qt::processCommand(Command *cmd)
     }
     break;
     case COMMAND_DEV_TOOLS: {
-        doEvents();
         int wv = cmd->args[0].toInt();
         if (_views.contains(wv)) {
             WebviewWindow *w = _views[wv];
@@ -282,7 +274,6 @@ void Rktwebview_qt::processCommand(Command *cmd)
     case COMMAND_MIN_WIN:
     case COMMAND_SHOW_NORMAL_WIN:
     {
-        doEvents();
         int wv = cmd->args[0].toInt();
         if (_views.contains(wv)) {
             WebviewWindow *w = _views[wv];
@@ -308,7 +299,6 @@ void Rktwebview_qt::processCommand(Command *cmd)
     break;
     case COMMAND_WINDOW_STATUS:
     {
-        doEvents();
         int wv = cmd->args[0].toInt();
         window_state_t ws = window_state_t::invalid;
         if (_views.contains(wv)) {
@@ -336,7 +326,6 @@ void Rktwebview_qt::processCommand(Command *cmd)
     }
     break;
     case COMMAND_MOVE: {
-        doEvents();
         int wv = cmd->args[0].toInt();
         int x = cmd->args[1].toInt();
         int y = cmd->args[2].toInt();
@@ -345,7 +334,7 @@ void Rktwebview_qt::processCommand(Command *cmd)
             int move_count = w->moveCount();
             w->move(x, y);
             while (w->moveCount() == move_count) {
-                doEvents();
+                _app->processEvents();
             }
             cmd->result = true;
         } else {
@@ -355,7 +344,6 @@ void Rktwebview_qt::processCommand(Command *cmd)
     }
     break;
     case COMMAND_RESIZE: {
-        doEvents();
         int wv = cmd->args[0].toInt();
         int width = cmd->args[1].toInt();
         int height = cmd->args[2].toInt();
@@ -364,7 +352,7 @@ void Rktwebview_qt::processCommand(Command *cmd)
             int resize_count = w->resizeCount();
             w->resize(width, height);
             while (w->resizeCount() == resize_count) {
-                doEvents();
+                _app->processEvents();
             }
             cmd->result = true;
         } else {
@@ -652,6 +640,11 @@ window_state_t Rktwebview_qt::rktWindowState(rktwebview_t w)
     return ws;
 }
 
+int Rktwebview_qt::openWindows()
+{
+    return _views.size();
+}
+
 void Rktwebview_qt::rktQuit()
 {
     Command c(COMMAND_QUIT);
@@ -730,9 +723,7 @@ result_t Rktwebview_qt::rktChooseDir(rktwebview_t w, const char *title, const ch
     c.args.push_back(s_base_dir);
 
     postCommand(&c);
-    while(!c.done) {
-        doEvents();
-    }
+    while(!c.done) { doEvents(); }
 
     bool r = c.result.toBool();
     return r ? result_t::oke : result_t::resize_failed;
@@ -750,9 +741,7 @@ result_t Rktwebview_qt::rktFileOpen(rktwebview_t w, const char *title, const cha
     c.args.push_back(s_pe);
 
     postCommand(&c);
-    while(!c.done) {
-        doEvents();
-    }
+    while(!c.done) { doEvents(); }
 
     bool r = c.result.toBool();
     return r ? result_t::oke : result_t::resize_failed;
@@ -770,9 +759,7 @@ result_t Rktwebview_qt::rktFileSave(rktwebview_t w, const char *title, const cha
     c.args.push_back(s_pe);
 
     postCommand(&c);
-    while(!c.done) {
-        doEvents();
-    }
+    while(!c.done) { doEvents(); }
 
     bool r = c.result.toBool();
     return r ? result_t::oke : result_t::resize_failed;
@@ -859,9 +846,7 @@ result_t Rktwebview_qt::rktMessageBox(rktwebview_t w, const char *title, const c
 
     postCommand(&c);
 
-    while(!c.done) {
-        doEvents();
-    }
+    while(!c.done) { doEvents(); }
 
     bool r = c.result.toBool();
     return r ? result_t::oke : result_t::failed;
diff --git a/rktwebview_qt/rktwebview_qt.h b/rktwebview_qt/rktwebview_qt.h
index e83de37..16e5599 100644
--- a/rktwebview_qt/rktwebview_qt.h
+++ b/rktwebview_qt/rktwebview_qt.h
@@ -115,6 +115,9 @@ public:
     void pageLoaded(rktwebview_t w, bool ok);
     void onPageLoad(rktwebview_t w);
 
+public:
+    int openWindows();
+
 public:
     void triggerEvent(rktwebview_t wv, const QString &msg);
     void triggerEvent(rktwebview_t wv, const EventContainer &e);
diff --git a/rktwebview_qt/rktwebview_test.cpp b/rktwebview_qt/rktwebview_test.cpp
index 9075755..681f84d 100644
--- a/rktwebview_qt/rktwebview_test.cpp
+++ b/rktwebview_qt/rktwebview_test.cpp
@@ -34,10 +34,16 @@ int main(int argc, char *argv[])
 
     int wv = rkt_webview_create(context, 0);
 
+    rkt_data_t *d = rkt_webview_info();
+    rkt_webview_free_data(d);
+
     rkt_webview_move(wv, 100, 200);
     rkt_webview_resize(wv, 800, 600);
     rkt_webview_set_url(wv, "https://wikipedia.org");
 
+    d = rkt_webview_info();
+    rkt_webview_free_data(d);
+
     while(rkt_webview_events_waiting() > 0) {
         rkt_data_t *d = rkt_webview_get_event();
         rkt_webview_free_data(d);
@@ -47,8 +53,13 @@ int main(int argc, char *argv[])
 #else
     sleep(10);
 #endif
+    d = rkt_webview_info();
+    rkt_webview_free_data(d);
 
     rkt_webview_close(wv);
 
+    d = rkt_webview_info();
+    rkt_webview_free_data(d);
+
     rkt_webview_cleanup();
 }
diff --git a/rktwebview_qt/rktwebview_types.h b/rktwebview_qt/rktwebview_types.h
index a1edcc8..fcac80f 100644
--- a/rktwebview_qt/rktwebview_types.h
+++ b/rktwebview_qt/rktwebview_types.h
@@ -71,10 +71,24 @@ typedef struct {
     int api_patch;
 } rkt_version_t;
 
+typedef struct {
+    int shm_usage;
+    int shm_free_depth;
+    int shm_free_size;
+    int shm_item_depth;
+    int shm_item_size;
+    double shm_item_usage_factor;
+    int open_windows;
+    int function_calls;
+    int events;
+    char *log_file;
+} rkt_metrics_t;
+
 typedef enum {
     version = 1,
     event = 2,
-    js_result = 3
+    js_result = 3,
+    metrics = 4
 } rkt_data_kind_t;
 
 typedef struct {
@@ -83,6 +97,7 @@ typedef struct {
         rkt_version_t    version;
         rkt_event_t      event;
         rkt_js_result_t  js_result;
+        rkt_metrics_t    metrics;
     } data;
 } rkt_data_t;
 
diff --git a/rktwebview_qt/shm.cpp b/rktwebview_qt/shm.cpp
index 74c3fe8..d4a6d5d 100644
--- a/rktwebview_qt/shm.cpp
+++ b/rktwebview_qt/shm.cpp
@@ -11,8 +11,8 @@ typedef struct __shm_item__ {
 
     ShmPlace next;
     ShmPlace prev;
-    size_t   size;
-
+    int      size;
+    int      alloc_size;
 } ShmItem;
 
 
@@ -69,6 +69,40 @@ public:
         return _mem + place;
     }
 
+public:
+    void info(int &usage, int &free_depth, int &free_size, int &item_depth, int &item_size, double &usage_factor) {
+        enterCritical();
+
+        usage = *_used;
+
+        auto count = [this](ShmPlace *l, int &depth, int &size, double &factor) {
+            depth = 0;
+            size = 0;
+            int alloc_size = 0;
+            ShmPlace p = *l;
+            while (p != SHM_NULL) {
+                //p -= sizeof(ShmItem);
+                ShmItem *i;
+                ref(p, &i);
+                size += i->size;
+                alloc_size += i->alloc_size;
+                depth += 1;
+                p = i->next;
+            }
+            if (size > 0) {
+                factor = (static_cast<double>(alloc_size) / static_cast<double>(size));
+            } else {
+                factor = 1.0;
+            }
+        };
+
+        double x;
+        count(_free_list, free_depth, free_size, x);
+        count(_first, item_depth, item_size, usage_factor);
+
+        leaveCritical();
+    }
+
 public:
     int alloc(size_t bytes) {
         enterCritical();
@@ -104,6 +138,7 @@ public:
                 first_i->prev = p_i;
             }
             i->prev = SHM_NULL;
+            i->alloc_size = bytes;
 
             *_first = p_i;
             place = p_i + sizeof(ShmItem);
@@ -118,6 +153,7 @@ public:
                 *_used = u;
                 i->prev = SHM_NULL;
                 i->size = bytes;
+                i->alloc_size = bytes;
                 i->next = *_first;
                 if (*_first != SHM_NULL) {
                     ShmItem *first_i;
@@ -574,6 +610,11 @@ void *Shm::ref(int place)
     return _shm_api->ref(place);
 }
 
+void Shm::info(int &usage, int &free_depth, int &free_size, int &item_depth, int &item_size, double &usage_factor)
+{
+    _shm_api->info(usage, free_depth, free_size, item_depth, item_size, usage_factor);
+}
+
 void Shm::lock()
 {
     _shm_api->enterCritical();
diff --git a/rktwebview_qt/shm.h b/rktwebview_qt/shm.h
index 8de1d08..32b9fc9 100644
--- a/rktwebview_qt/shm.h
+++ b/rktwebview_qt/shm.h
@@ -52,6 +52,9 @@ public:
 public:
     void *ref(int place);
 
+public:
+    void info(int &usage, int &free_depth, int &free_size, int &item_depth, int &item_size, double &usage_factor);
+
 public:
     Shm(const char *name, size_t bytes, bool owner);
     ~Shm();
diff --git a/rktwebview_qt/utils.h b/rktwebview_qt/utils.h
index b7e42d6..d7ccabc 100644
--- a/rktwebview_qt/utils.h
+++ b/rktwebview_qt/utils.h
@@ -2,6 +2,7 @@
 #define UTILS_H
 
 #include <string>
+#include "rktwebview_types.h"
 
 inline std::string basedir(const std::string &path)
 {
@@ -56,4 +57,24 @@ const char *logIndicator(int l);
 #define INFO2(msg, a, b)  MKL2(LOG_INFO, msg, a, b)
 #define DEBUG2(msg, a, b) MKL2(LOG_DEBUG, msg, a, b)
 
+inline void do_free_data(rkt_data_t *d)
+{
+    if (d == nullptr) { return; }
+
+    if (d->kind == version) {
+        free(d);
+    } else if (d->kind == metrics) {
+        free(d->data.metrics.log_file);
+        free(d);
+    } else if (d->kind == event) {
+        free(d->data.event.event);
+        free(d);
+    } else if (d->kind == js_result) {
+        free(d->data.js_result.value);
+        free(d);
+    } else {
+        ERROR1("UNEXPECTED: data kind %d cannot be freed\n", d->kind);
+    }
+}
+
 #endif // UTILS_H