77 lines
2.4 KiB
Lua
77 lines
2.4 KiB
Lua
---------------------------------------------------
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-- Licensed under the GNU General Public License v2
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-- * (c) 2011, Jörg T. <jthalheim@gmail.com>
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---------------------------------------------------
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-- {{{ Grab environment
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local pairs = pairs
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local io = { lines = io.lines }
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local setmetatable = setmetatable
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local string = { match = string.match }
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local helpers = require("vicious.helpers")
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local os = {
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time = os.time,
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difftime = os.difftime
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}
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-- }}}
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-- Disk I/O: provides I/O statistics for requested storage devices
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-- vicious.widgets.dio
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local dio_linux = {}
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-- Initialize function tables
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local disk_usage = {}
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local disk_stats = {}
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local disk_time = 0
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-- Constant definitions
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local unit = { ["s"] = 1, ["kb"] = 2, ["mb"] = 2048 }
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local time_unit = { ["ms"] = 1, ["s"] = 1000 }
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-- {{{ Disk I/O widget type
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local function worker(format)
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local disk_lines = {}
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for line in io.lines("/proc/diskstats") do
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local device, read, write, iotime =
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-- Linux kernel documentation: Documentation/iostats.txt
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string.match(line, "([^%s]+) %d+ %d+ (%d+) %d+ %d+ %d+ (%d+) %d+ %d+ (%d+)")
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disk_lines[device] = { read, write, iotime }
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end
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local time = os.time()
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local interval = os.difftime(time, disk_time)
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if interval == 0 then interval = 1 end
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for device, stats in pairs(disk_lines) do
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-- Avoid insane values on startup
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local last_stats = disk_stats[device] or stats
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-- Check for overflows and counter resets (> 2^32)
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if stats[1] < last_stats[1] or stats[2] < last_stats[2] then
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last_stats[1], last_stats[2], last_stats[3] = stats[1], stats[2], stats[3]
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end
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-- Diskstats are absolute, substract our last reading
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-- * divide by timediff because we don't know the timer value
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local read = (stats[1] - last_stats[1]) / interval
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local write = (stats[2] - last_stats[2]) / interval
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local iotime = (stats[3] - last_stats[3]) / interval
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-- Calculate and store I/O
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helpers.uformat(disk_usage, device.." read", read, unit)
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helpers.uformat(disk_usage, device.." write", write, unit)
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helpers.uformat(disk_usage, device.." total", read + write, unit)
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helpers.uformat(disk_usage, device.." iotime", iotime, time_unit)
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end
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disk_time = time
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disk_stats = disk_lines
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return disk_usage
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end
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-- }}}
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return setmetatable(dio_linux, { __call = function(_, ...) return worker(...) end })
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