add udp stat to nb_conn_sys as nb_conn_sys_udp

trunk/src/app/srs_app_utility.hpp

@@ -350,6 +350,55 @@ public:
     unsigned long pgpgout;
     
     // @see: https://www.kernel.org/doc/Documentation/iostats.txt
+    // @see: cat /proc/diskstats
+    //
+    // Number of issued reads. 
+    // This is the total number of reads completed successfully.
+    unsigned long long nb_read;
+    // Number of reads merged
+    unsigned long long nb_mread;
+    // Number of sectors read. 
+    // This is the total number of sectors read successfully.
+    unsigned long long nb_sread;
+    // Number of milliseconds spent reading. 
+    // This is the total number of milliseconds spent by all reads 
+    // (as measured from __make_request() to end_that_request_last()).
+    unsigned long long ms_read;
+    //
+    // Number of writes completed. 
+    // This is the total number of writes completed successfully
+    unsigned long long nb_write;
+    // Number of writes merged Reads and writes which are adjacent 
+    // to each other may be merged for efficiency. Thus two 4K 
+    // reads may become one 8K read before it is ultimately 
+    // handed to the disk, and so it will be counted (and queued) 
+    // as only one I/O. This field lets you know how often this was done.
+    unsigned long long nb_mwrite;
+    // Number of sectors written. 
+    // This is the total number of sectors written successfully.
+    unsigned long long nb_swrite;
+    // Number of milliseconds spent writing . 
+    // This is the total number of milliseconds spent by all writes 
+    // (as measured from __make_request() to end_that_request_last()).
+    unsigned long long ms_write;
+    //
+    // Number of I/Os currently in progress. 
+    // The only field that should go to zero. 
+    // Incremented as requests are given to appropriate request_queue_t 
+    // and decremented as they finish.
+    unsigned long long nb_current;
+    // Number of milliseconds spent doing I/Os. 
+    // This field is increased so long as field 9 is nonzero.
+    unsigned long long ms_total;
+    // Number of milliseconds spent doing I/Os. 
+    // This field is incremented at each I/O start, I/O completion, 
+    // I/O merge, or read of these stats by the number of I/Os in 
+    // progress (field 9) times the number of milliseconds spent 
+    // doing I/O since the last update of this field. This can 
+    // provide an easy measure of both I/O completion time and 
+    // the backlog that may be accumulating.
+    // weighting total.
+    unsigned long long ms_wtotal;
 
 public:
     SrsDiskStat();
@@ -529,6 +578,7 @@ public:
     int nb_conn_sys_et; // established
     int nb_conn_sys_tw; // time wait
     int nb_conn_sys_ls; // listen
+    int nb_conn_sys_udp; // udp
     int nb_conn_srs;
     
 public: