add config item for the stat disk device name

@@ -88,6 +88,9 @@ stats {
     # we may retrieve more than one network device.
     # default: 0
     network_device_index    0;
+    # the device name to stat the disk iops.
+    # ignore the device of /proc/diskstats if not configed.
+    disk_device_name sda sdb xvda xvdb;
 }
 
 #############################################################################################

@@ -1249,7 +1249,7 @@ int SrsConfig::check_config()
         SrsConfDirective* conf = get_stats();
         for (int i = 0; conf && i < (int)conf->directives.size(); i++) {
             string n = conf->at(i)->name;
-            if (n != "network_device_index") {
+            if (n != "network_device_index" && n != "disk_device_name") {
                 ret = ERROR_SYSTEM_CONFIG_INVALID;
                 srs_error("unsupported stats directive %s, ret=%d", n.c_str(), ret);
                 return ret;
@@ -3194,6 +3194,22 @@ int SrsConfig::get_stats_network_device_index()
     return ::atoi(conf->arg0().c_str());
 }
 
+SrsConfDirective* SrsConfig::get_stats_disk_device()
+{
+    SrsConfDirective* conf = get_stats();
+    
+    if (!conf) {
+        return NULL;
+    }
+    
+    conf = conf->get("disk_device_name");
+    if (!conf || conf->args.size() == 0) {
+        return NULL;
+    }
+    
+    return conf;
+}
+
 namespace _srs_internal
 {
     SrsConfigBuffer::SrsConfigBuffer()

@@ -943,6 +943,12 @@ public:
     * for example, 0 means the eth0 maybe.
     */
     virtual int                 get_stats_network_device_index();
+    /**
+    * get the disk stat device name list.
+    * the device name configed in args of directive.
+    * @return the disk device name to stat. NULL if not configed.
+    */
+    virtual SrsConfDirective*   get_stats_disk_device();
 };
 
 namespace _srs_internal

@@ -415,15 +415,22 @@ bool srs_get_disk_vmstat_stat(SrsDiskStat& r)
 
 bool srs_get_disk_diskstats_stat(SrsDiskStat& r)
 {
+    r.ok = false;
+    r.sample_time = srs_get_system_time_ms();
+    
+    // if disabled, ignore all devices.
+    SrsConfDirective* conf = _srs_config->get_stats_disk_device();
+    if (conf == NULL) {
+        r.ok = true;
+        return true;
+    }
+    
     FILE* f = fopen("/proc/diskstats", "r");
     if (f == NULL) {
         srs_warn("open vmstat failed, ignore");
         return false;
     }
     
-    r.ok = false;
-    r.sample_time = srs_get_system_time_ms();
-    
     static char buf[1024];
     while (fgets(buf, sizeof(buf), f)) {
         unsigned int major = 0;
@@ -447,9 +454,14 @@ bool srs_get_disk_diskstats_stat(SrsDiskStat& r)
             &rd_sectors, &rd_ticks, &wr_ios, &wr_merges,
             &wr_sectors, &wr_ticks, &nb_current, &ticks, &aveq);
         srs_assert(ret == 14);
-        
-        // TODO: FIMXE: config it.
-        if (strcmp("sda", name) == 0) {
+
+        for (int i = 0; i < (int)conf->args.size(); i++) {
+            string name_ok = conf->args.at(i);
+            
+            if (strcmp(name_ok.c_str(), name) != 0) {
+                continue;
+            }
+            
             r.rd_ios += rd_ios;
             r.rd_merges += rd_merges;
             r.rd_sectors += rd_sectors;
@@ -461,6 +473,8 @@ bool srs_get_disk_diskstats_stat(SrsDiskStat& r)
             r.nb_current += nb_current;
             r.ticks += ticks;
             r.aveq += aveq;
+            
+            break;
         }
     }
     
@@ -477,9 +491,18 @@ void srs_update_disk_stat()
     if (!srs_get_disk_vmstat_stat(r)) {
         return;
     }
+    if (!srs_get_disk_diskstats_stat(r)) {
+        return;
+    }
     
     SrsDiskStat& o = _srs_disk_stat;
-    if (o.ok) {
+    if (!o.ok) {
+        _srs_disk_stat = r;
+        return;
+    }
+    
+    // vmstat
+    if (true) {
         int64_t duration_ms = r.sample_time - o.sample_time;
         
         if (o.pgpgin > 0 && r.pgpgin > o.pgpgin && duration_ms > 0) {
@@ -492,8 +515,6 @@ void srs_update_disk_stat()
             r.out_KBps = (r.pgpgout - o.pgpgout) * 1000 / duration_ms;
         }
     }
-    
-    _srs_disk_stat = r;
 }
 
 SrsMemInfo::SrsMemInfo()

@@ -156,6 +156,9 @@ std::string __full_conf = ""
     "    # we may retrieve more than one network device.                                                                                    \n"
     "    # default: 0                                                                                                                       \n"
     "    network_device_index    0;                                                                                                         \n"
+    "    # the device name to stat the disk iops.                                                                                           \n"
+    "    # ignore the device of /proc/diskstats if not configed.                                                                            \n"
+    "    disk_device_name sda sdb xvda xvdb;                                                                                                \n"
     "}                                                                                                                                      \n"
     "                                                                                                                                       \n"
     "#############################################################################################                                          \n"
@@ -1839,8 +1842,11 @@ VOID TEST(ConfigMainTest, ParseFullConf)
     EXPECT_EQ(9300, conf.get_heartbeat_interval());
     EXPECT_STREQ("http://127.0.0.1:8085/api/v1/servers", conf.get_heartbeat_url().c_str());
     EXPECT_STREQ("my-srs-device", conf.get_heartbeat_device_id().c_str());
-    EXPECT_EQ(0, conf.get_stats_network_device_index());
     EXPECT_FALSE(conf.get_heartbeat_summaries());
+
+    EXPECT_EQ(0, conf.get_stats_network_device_index());
+    ASSERT_TRUE(conf.get_stats_disk_device() != NULL);
+    EXPECT_EQ(4, (int)conf.get_stats_disk_device()->args.size());
     
     EXPECT_TRUE(conf.get_http_api_enabled());
     EXPECT_EQ(1985, conf.get_http_api_listen());
@@ -4633,6 +4639,16 @@ VOID TEST(ConfigMainTest, CheckConf_stats)
         MockSrsConfig conf;
         EXPECT_TRUE(ERROR_SUCCESS != conf.parse(_MIN_OK_CONF"stats{network_device_index -1;}"));
     }
+    
+    if (true) {
+        MockSrsConfig conf;
+        EXPECT_TRUE(ERROR_SUCCESS == conf.parse(_MIN_OK_CONF"stats{disk_device_name sda;}"));
+    }
+    
+    if (true) {
+        MockSrsConfig conf;
+        EXPECT_TRUE(ERROR_SUCCESS != conf.parse(_MIN_OK_CONF"stats{disk_device_names sda;}"));
+    }
 }
 
 VOID TEST(ConfigMainTest, CheckConf_http_stream)