Add iotime field to dio widget.

widgets/dio_linux.lua

@@ -27,16 +27,17 @@ local disk_stats = {}
 local disk_time  = 0
 -- Constant definitions
 local unit = { ["s"] = 1, ["kb"] = 2, ["mb"] = 2048 }
+local time_unit = { ["ms"] = 1, ["s"] = 1000 }
 
 -- {{{ Disk I/O widget type
 local function worker(format)
     local disk_lines = {}
 
     for line in io.lines("/proc/diskstats") do
-        local device, read, write =
+        local device, read, write, iotime =
             -- Linux kernel documentation: Documentation/iostats.txt
-            string.match(line, "([^%s]+) %d+ %d+ (%d+) %d+ %d+ %d+ (%d+)")
-        disk_lines[device] = { read, write }
+          string.match(line, "([^%s]+) %d+ %d+ (%d+) %d+ %d+ %d+ (%d+) %d+ %d+ (%d+)")
+        disk_lines[device] = { read, write, iotime }
     end
 
     local time = os.time()
@@ -49,18 +50,20 @@ local function worker(format)
 
         -- Check for overflows and counter resets (> 2^32)
         if stats[1] < last_stats[1] or stats[2] < last_stats[2] then
-            last_stats[1], last_stats[2] = stats[1], stats[2]
+            last_stats[1], last_stats[2], last_stats[3] = stats[1], stats[2], stats[3]
         end
 
         -- Diskstats are absolute, substract our last reading
         -- * divide by timediff because we don't know the timer value
         local read  = (stats[1] - last_stats[1]) / interval
         local write = (stats[2] - last_stats[2]) / interval
+        local iotime = (stats[3] - last_stats[3]) / interval
 
         -- Calculate and store I/O
         helpers.uformat(disk_usage, device.." read",  read,  unit)
         helpers.uformat(disk_usage, device.." write", write, unit)
         helpers.uformat(disk_usage, device.." total", read + write, unit)
+        helpers.uformat(disk_usage, device.." iotime", iotime, time_unit)
     end
 
     disk_time  = time