Add some values to OOM log msg #24501

Exposing cell_queues_get_total_allocation(), buf_get_total_allocation(),
tor_compress_get_total_allocation(), tor_compress_get_total_allocation() when
hit MaxMemInQueues threshold.

Fixes #24501

Signed-off-by: Fernando Fernandez Mancera <ffernandezmancera@gmail.com>

changes/ticket24501

@@ -0,0 +1,3 @@
+  o Minor features (logging): 
+    - Make the log more quantitative when we hit MaxMemInQueues threshold
+      exposing some values. Closes ticket 24501.

src/or/circuitlist.c

@@ -2329,9 +2329,15 @@ circuits_handle_oom(size_t current_allocation)
   int n_circuits_killed=0;
   int n_dirconns_killed=0;
   uint32_t now_ms;
-  log_notice(LD_GENERAL, "We're low on memory.  Killing circuits with "
+  log_notice(LD_GENERAL, "We're low on memory (cell queues total alloc: %zu,"
+             " buffer total alloc: %zu, tor compress total alloc: %zu,"
+             " rendezvous cache total alloc: %zu). Killing circuits with"
              " over-long queues. (This behavior is controlled by"
-             "MaxMemInQueues.)");
+             " MaxMemInQueues.)",
+             cell_queues_get_total_allocation(),
+             buf_get_total_allocation(),
+             tor_compress_get_total_allocation(),
+             rend_cache_get_total_allocation());
 
   {
     size_t mem_target = (size_t)(get_options()->MaxMemInQueues *

src/or/relay.c

@@ -2530,7 +2530,7 @@ packed_cell_mem_cost(void)
 }
 
 /* DOCDOC */
-STATIC size_t
+size_t
 cell_queues_get_total_allocation(void)
 {
   return total_cells_allocated * packed_cell_mem_cost();

src/or/relay.h

@@ -17,6 +17,7 @@ extern uint64_t stats_n_relay_cells_delivered;
 
 int circuit_receive_relay_cell(cell_t *cell, circuit_t *circ,
                                cell_direction_t cell_direction);
+size_t cell_queues_get_total_allocation(void);
 
 void relay_header_pack(uint8_t *dest, const relay_header_t *src);
 void relay_header_unpack(relay_header_t *dest, const uint8_t *src);
@@ -102,7 +103,6 @@ STATIC int connection_edge_process_resolved_cell(edge_connection_t *conn,
                                                  const relay_header_t *rh);
 STATIC packed_cell_t *packed_cell_new(void);
 STATIC packed_cell_t *cell_queue_pop(cell_queue_t *queue);
-STATIC size_t cell_queues_get_total_allocation(void);
 STATIC int cell_queues_check_size(void);
 #endif /* defined(RELAY_PRIVATE) */