dynamic_debug: print ram usage by ddebug tables if verbose

Print ram usage of dynamic-debug tables and verbose section so user
knows cost of enabling CONFIG_DYNAMIC_DEBUG.  This only counts the
size of the _ddebug tables for builtins and the __verbose section that
they refer to, not those used in loadable modules.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Acked-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 11 insertions, 1 deletions

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 66e0ec4d21f7..76da6aa66ce7 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -970,7 +970,8 @@ static int __init dynamic_debug_init(void)
         const char *modname = NULL;
         char *cmdline;
         int ret = 0;
-        int n = 0;
+        int n = 0, entries = 0, modct = 0;
+        int verbose_bytes = 0;
 
         if (__start___verbose == __stop___verbose) {
                 pr_warn("_ddebug table is empty in a "
@@ -981,7 +982,12 @@ static int __init dynamic_debug_init(void)
         modname = iter->modname;
         iter_start = iter;
         for (; iter < __stop___verbose; iter++) {
+                entries++;
+                verbose_bytes += strlen(iter->modname) + strlen(iter->function)
+                        + strlen(iter->filename) + strlen(iter->format);
+
                 if (strcmp(modname, iter->modname)) {
+                        modct++;
                         ret = ddebug_add_module(iter_start, n, modname);
                         if (ret)
                                 goto out_err;
@@ -996,6 +1002,10 @@ static int __init dynamic_debug_init(void)
                 goto out_err;
 
         ddebug_init_success = 1;
+        vpr_info("%d modules, %d entries and %d bytes in ddebug tables,"
+                " %d bytes in (readonly) verbose section\n",
+                modct, entries, (int)( modct * sizeof(struct ddebug_table)),
+                verbose_bytes + (int)(__stop___verbose - __start___verbose));
 
         /* apply ddebug_query boot param, dont unload tables on err */
         if (ddebug_setup_string[0] != '\0') {