logging: Add log mem shell command

Add log mem shell command to determine memory pool
usage of logging system.

Signed-off-by: Ryan Erickson <[email protected]>

Author: rerickson1

include/logging/log_msg.h

@@ -467,6 +467,22 @@ struct log_msg *log_msg_create_n(const char *str,
 				 log_arg_t *args,
 				 uint32_t nargs);
 
+/**
+ * @brief Get number of free blocks from the log mem pool
+ */
+uint32_t log_msg_mem_get_free(void);
+
+/**
+ * @brief Get number of used blocks from the log mem pool
+ */
+uint32_t log_msg_mem_get_used(void);
+
+/**
+ * @brief Get max used blocks from the log mem pool
+ */
+uint32_t log_msg_mem_get_max_used(void);
+
+
 /**
  * @}
  */

subsys/logging/log_cmds.c

@@ -403,6 +403,28 @@ static int cmd_log_strdup_utilization(const struct shell *shell,
 	return 0;
 }
 
+static int cmd_log_memory_slabs(const struct shell *sh, size_t argc, char **argv)
+{
+	uint32_t slabs_free;
+	uint32_t used;
+	uint32_t max;
+
+	slabs_free = log_msg_mem_get_free();
+	used = log_msg_mem_get_used();
+
+	shell_print(sh, "Blocks used:\t%d", used);
+	shell_print(sh, "Blocks free:\t%d", slabs_free);
+	if (IS_ENABLED(CONFIG_MEM_SLAB_TRACE_MAX_UTILIZATION)) {
+		max = log_msg_mem_get_max_used();
+		shell_print(sh, "Blocks max:\t%d", max);
+	} else {
+		shell_print(
+			sh,
+			"Enable CONFIG_MEM_SLAB_TRACE_MAX_UTILIZATION to get max memory utilization");
+	}
+
+	return 0;
+}
 
 SHELL_STATIC_SUBCMD_SET_CREATE(sub_log_backend,
 	SHELL_CMD_ARG(disable, &dsub_module_name,
@@ -436,31 +458,28 @@ static void backend_name_get(size_t idx, struct shell_static_entry *entry)
 
 SHELL_DYNAMIC_CMD_CREATE(dsub_backend_name_dynamic, backend_name_get);
 
-
-SHELL_STATIC_SUBCMD_SET_CREATE(sub_log_stat,
-	SHELL_CMD(backend, &dsub_backend_name_dynamic,
-			"Logger backends commands.", NULL),
+SHELL_STATIC_SUBCMD_SET_CREATE(
+	sub_log_stat,
+	SHELL_CMD(backend, &dsub_backend_name_dynamic, "Logger backends commands.", NULL),
 	SHELL_COND_CMD_ARG(CONFIG_SHELL_LOG_BACKEND, disable, &dsub_module_name,
-		"'log disable <module_0> .. <module_n>' disables logs in specified "
-		"modules (all if no modules specified).",
-		cmd_log_self_disable, 1, 255),
+			   "'log disable <module_0> .. <module_n>' disables logs in specified "
+			   "modules (all if no modules specified).",
+			   cmd_log_self_disable, 1, 255),
 	SHELL_COND_CMD_ARG(CONFIG_SHELL_LOG_BACKEND, enable, &dsub_severity_lvl,
-		"'log enable <level> <module_0> ...  <module_n>' enables logs up to"
-		" given level in specified modules (all if no modules specified).",
-		cmd_log_self_enable, 2, 255),
-	SHELL_COND_CMD(CONFIG_SHELL_LOG_BACKEND, go, NULL, "Resume logging",
-			cmd_log_self_go),
-	SHELL_COND_CMD(CONFIG_SHELL_LOG_BACKEND, halt, NULL, "Halt logging",
-			cmd_log_self_halt),
-	SHELL_CMD_ARG(list_backends, NULL, "Lists logger backends.",
-		      cmd_log_backends_list, 1, 0),
+			   "'log enable <level> <module_0> ...  <module_n>' enables logs up to"
+			   " given level in specified modules (all if no modules specified).",
+			   cmd_log_self_enable, 2, 255),
+	SHELL_COND_CMD(CONFIG_SHELL_LOG_BACKEND, go, NULL, "Resume logging", cmd_log_self_go),
+	SHELL_COND_CMD(CONFIG_SHELL_LOG_BACKEND, halt, NULL, "Halt logging", cmd_log_self_halt),
+	SHELL_CMD_ARG(list_backends, NULL, "Lists logger backends.", cmd_log_backends_list, 1, 0),
 	SHELL_COND_CMD(CONFIG_SHELL_LOG_BACKEND, status, NULL, "Logger status",
-			cmd_log_self_status),
-	SHELL_COND_CMD_ARG(CONFIG_LOG_STRDUP_POOL_PROFILING, strdup_utilization,
-			NULL, "Get utilization of string duplicates pool",
-			cmd_log_strdup_utilization, 1, 0),
-	SHELL_SUBCMD_SET_END
-);
+		       cmd_log_self_status),
+	SHELL_COND_CMD_ARG(CONFIG_LOG_STRDUP_POOL_PROFILING, strdup_utilization, NULL,
+			   "Get utilization of string duplicates pool", cmd_log_strdup_utilization,
+			   1, 0),
+	SHELL_COND_CMD(CONFIG_LOG_MODE_DEFERRED, mem, NULL, "Logger memory usage",
+		       cmd_log_memory_slabs),
+	SHELL_SUBCMD_SET_END);
 
 SHELL_CMD_REGISTER(log, &sub_log_stat, "Commands for controlling logger",
 		   NULL);

subsys/logging/log_msg.c

@@ -483,3 +483,18 @@ void log_msg_hexdump_data_get(struct log_msg *msg,
 {
 	log_msg_hexdump_data_op(msg, data, length, offset, false);
 }
+
+uint32_t log_msg_mem_get_free(void)
+{
+	return k_mem_slab_num_free_get(&log_msg_pool);
+}
+
+uint32_t log_msg_mem_get_used(void)
+{
+	return k_mem_slab_num_used_get(&log_msg_pool);
+}
+
+uint32_t log_msg_mem_get_max_used(void)
+{
+	return k_mem_slab_max_used_get(&log_msg_pool);
+}