finish stats_sizes rewrite

Now relies on CAS feature for runtime enable/disable tracking. Still usable if
enabled at starttime with CAS disabled. Also adds start option `-o
track_sizes`, and a stat for `stats settings`.

Finally, adds documentation and cleans up status outputs.

Could use some automated tests but not make or break for release.

1 files changed, 4 insertions, 0 deletions

diff --git a/items.h b/items.h
index 1a310bd..d235f87 100644
--- a/items.h
+++ b/items.h
@@ -22,8 +22,12 @@ void item_stats(ADD_STAT add_stats, void *c);
 void item_stats_totals(ADD_STAT add_stats, void *c);
 /*@null@*/
 void item_stats_sizes(ADD_STAT add_stats, void *c);
+void item_stats_sizes_init(void);
 void item_stats_sizes_enable(ADD_STAT add_stats, void *c);
 void item_stats_sizes_disable(ADD_STAT add_stats, void *c);
+void item_stats_sizes_add(item *it);
+void item_stats_sizes_remove(item *it);
+bool item_stats_sizes_status(void);
 
 item *do_item_get(const char *key, const size_t nkey, const uint32_t hv, conn *c);
 item *do_item_touch(const char *key, const size_t nkey, uint32_t exptime, const uint32_t hv, conn *c);