proc: show actual mem usage in /proc/sys/mars/

mars_trans_logger.c

@@ -39,6 +39,8 @@
 #define MARS_RPL(_args...) /*empty*/
 #endif
 
+int trans_logger_mem_usage; // in KB
+EXPORT_SYMBOL_GPL(trans_logger_mem_usage);
 
 ///////////////////////// own type definitions ////////////////////////
 
@@ -1978,6 +1980,7 @@ int _do_ranking(struct trans_logger_brick *brick, struct rank_data rkd[])
 			{ brick_global_memlimit,            -1000 },
 		};
 		int global_mem_used  = atomic64_read(&global_mshadow_used) / 1024;
+		trans_logger_mem_usage = global_mem_used;
 
 		if (global_mem_used >= brick_global_memlimit)
 			delay_callers = true;

mars_trans_logger.h

@@ -14,6 +14,8 @@
 #include "lib_pairing_heap.h"
 #include "lib_queue.h"
 
+extern int trans_logger_mem_usage; // in KB
+
 ////////////////////////////////////////////////////////////////////
 
 _PAIRING_HEAP_TYPEDEF(logger,)

sy_old/mars_proc.c

@@ -15,6 +15,7 @@
 #include "mars_proc.h"
 #include "../mars_client.h"
 #include "../mars_server.h"
+#include "../mars_trans_logger.h"
 
 mars_info_fn mars_info = NULL;
 
@@ -189,6 +190,15 @@ ctl_table mars_table[] = {
 		.proc_handler	= &proc_dointvec,
 		_CTL_STRATEGY(sysctl_intvec)
 	},
+	{
+		_CTL_NAME
+		.procname	= "mem_used_kb",
+		.data           = &trans_logger_mem_usage,
+		.maxlen         = sizeof(int),
+		.mode		= 0400,
+		.proc_handler	= &proc_dointvec,
+		_CTL_STRATEGY(sysctl_intvec)
+	},
 	{
 		_CTL_NAME
 		.procname	= "logrot_auto_gb",