mem trimming - have e trim its own memory every now and again

use malloc_trim() if it exists to do this every now and again
(idle_enterer if there isa gap > 10 sec since last clean cycle
so no added wakeups).

src/bin/e.h

@@ -104,6 +104,10 @@ void *alloca (size_t);
 #  include <execinfo.h>
 # endif
 
+# ifdef HAVE_MALLOC_H
+#  include <malloc.h>
+# endif
+
 // XXX: FIXME: TMP solution for window stack until api is settled
 #define EFL_BETA_API_SUPPORT
 

src/bin/e_main.c

@@ -1752,10 +1752,23 @@ _e_main_cb_idle_after(void *data EINA_UNUSED)
    edje_freeze();
 
    if (first_idle)
-     TS("SLEEP");
-   first_idle = 0;
+     {
+        TS("SLEEP");
+        first_idle = 0;
+     }
    e_precache_end = EINA_TRUE;
 
+// every now and again trim malloc memory to stay lean-ish
+#ifdef HAVE_MALLOC_TRIM
+   static double t_last_clean = 0.0;
+   double t = ecore_time_get();
+   if ((t - t_last_clean) > 10.0)
+     {
+        t_last_clean = t;
+        malloc_trim(0);
+     }
+#endif
+
    return ECORE_CALLBACK_RENEW;
 }