e system - force a malloc trim regularly to keep back-end proc minimal

meson.build

@@ -154,6 +154,12 @@ if cc.has_header('sys/procctl.h') == true
   config_h.set('HAVE_PROCCTL'          , '1')
 endif
 
+if cc.has_header('malloc.h') == true
+  config_h.set('HAVE_MALLOC_H'     , '1')
+endif
+if cc.has_function('malloc_trim') == true
+  config_h.set('HAVE_MALLOC_TRIM'      , '1')
+endif
 if cc.has_function('setenv') == true
   config_h.set('HAVE_SETENV'           , '1')
 endif

src/bin/system/e_system.h

@@ -66,6 +66,9 @@ void *alloca (size_t);
 # include <inttypes.h>
 # include <assert.h>
 # include <fcntl.h>
+# ifdef HAVE_MALLOC_H
+#  include <malloc.h>
+# endif
 
 #if defined (__FreeBSD__) || defined (__OpenBSD__)
 # include <sys/sysctl.h>

src/bin/system/e_system_main.c

@@ -257,6 +257,17 @@ singleton_setup(void)
    ecore_thread_feedback_run(_cb_die, NULL, NULL, NULL, NULL, EINA_TRUE);
 }
 
+static Eina_Bool
+_cb_idle_enterer(void *data EINA_UNUSED)
+{
+   // welcome to unportable code land... :)
+   // trim process down as much as possible when going idle
+#ifdef HAVE_MALLOC_TRIM
+   malloc_trim(0);
+#endif
+   return ECORE_CALLBACK_RENEW;
+}
+
 int
 main(int argc EINA_UNUSED, const char **argv EINA_UNUSED)
 {
@@ -282,6 +293,8 @@ main(int argc EINA_UNUSED, const char **argv EINA_UNUSED)
    e_system_l2ping_init();
    e_system_cpufreq_init();
 
+   ecore_idle_enterer_add(_cb_idle_enterer, NULL);
+
    ecore_main_loop_begin();
 
    e_system_cpufreq_shutdown();