74 lines
2.2 KiB
Lua
74 lines
2.2 KiB
Lua
---------------------------------------------------
|
|
-- Licensed under the GNU General Public License v2
|
|
-- * (c) 2011, Jörg T. <jthalheim@gmail.com>
|
|
---------------------------------------------------
|
|
|
|
-- {{{ Grab environment
|
|
local pairs = pairs
|
|
local io = { lines = io.lines }
|
|
local setmetatable = setmetatable
|
|
local string = { match = string.match }
|
|
local helpers = require("vicious.helpers")
|
|
local os = {
|
|
time = os.time,
|
|
difftime = os.difftime
|
|
}
|
|
-- }}}
|
|
|
|
|
|
-- Disk I/O: provides I/O statistics for requested storage devices
|
|
-- vicious.widgets.dio
|
|
local dio_linux = {}
|
|
|
|
|
|
-- Initialize function tables
|
|
local disk_usage = {}
|
|
local disk_stats = {}
|
|
local disk_time = 0
|
|
-- Constant definitions
|
|
local unit = { ["s"] = 1, ["kb"] = 2, ["mb"] = 2048 }
|
|
|
|
-- {{{ Disk I/O widget type
|
|
local function worker(format)
|
|
local disk_lines = {}
|
|
|
|
for line in io.lines("/proc/diskstats") do
|
|
local device, read, write =
|
|
-- Linux kernel documentation: Documentation/iostats.txt
|
|
string.match(line, "([^%s]+) %d+ %d+ (%d+) %d+ %d+ %d+ (%d+)")
|
|
disk_lines[device] = { read, write }
|
|
end
|
|
|
|
local time = os.time()
|
|
local interval = os.difftime(time, disk_time)
|
|
if interval == 0 then interval = 1 end
|
|
|
|
for device, stats in pairs(disk_lines) do
|
|
-- Avoid insane values on startup
|
|
local last_stats = disk_stats[device] or stats
|
|
|
|
-- 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]
|
|
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
|
|
|
|
-- 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)
|
|
end
|
|
|
|
disk_time = time
|
|
disk_stats = disk_lines
|
|
|
|
return disk_usage
|
|
end
|
|
-- }}}
|
|
|
|
return setmetatable(dio_linux, { __call = function(_, ...) return worker(...) end })
|