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FIX make readwrite query all my devices

This commit is contained in:
Nathan Dwarshuis 2021-07-18 00:38:43 -04:00
parent 269edfdd65
commit 031f9b9881
1 changed files with 26 additions and 14 deletions
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34
drawing/ReadWrite.lua
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@ -5,6 +5,14 @@ local Geometry = require 'Geometry'
return function(update_freq)
local PLOT_SEC_BREAK = 20
local PLOT_HEIGHT = 56
local DEVICES = {'sda', 'nvme0n1'}
-- the sector size of any block device in linux is 512 bytes
-- see https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/types.h?id=v4.4-rc6#n121
local BLOCK_SIZE_BYTES = 512
-- fields 3 and 7 (sectors read and written)
local RW_REGEX = '%s+%d+%s+%d+%s+(%d+)%s+%d+%s+%d+%s+%d+%s+(%d+)'
local __tonumber = tonumber
local __string_match = string.match
@ -61,21 +69,25 @@ return function(update_freq)
-----------------------------------------------------------------------------
-- update function
-- TODO add more devices to this
local BLOCK_SIZE_BYTES = 512
local STAT_FILE = '/sys/block/sda/stat'
local DEVICE_PATHS = {}
for i = 1, #DEVICES do
DEVICE_PATHS[i] = string.format('/sys/block/%s/stat', DEVICES[i])
end
-- fields 3 and 7 (sectors read and written)
local RW_REGEX = '%s+%d+%s+%d+%s+(%d+)%s+%d+%s+%d+%s+%d+%s+(%d+)'
local read_stat_file = function()
local bytes_r, bytes_w = __string_match(Util.read_file(STAT_FILE), RW_REGEX)
return __tonumber(bytes_r) * BLOCK_SIZE_BYTES, __tonumber(bytes_w) * BLOCK_SIZE_BYTES
local read_devices = function()
local read_bytes = 0
local write_bytes = 0
for _, path in pairs(DEVICE_PATHS) do
local r, w = __string_match(Util.read_file(path), RW_REGEX)
read_bytes = read_bytes + __tonumber(r)
write_bytes = write_bytes + __tonumber(w)
end
return read_bytes * BLOCK_SIZE_BYTES, write_bytes * BLOCK_SIZE_BYTES
end
reads.byte_cnt = 0
writes.byte_cnt = 0
reads.prev_byte_cnt, writes.prev_byte_cnt = read_stat_file()
reads.prev_byte_cnt, writes.prev_byte_cnt = read_devices()
local update_stat = function(cr, stat, byte_cnt)
local delta_bytes = byte_cnt - stat.prev_byte_cnt
@ -90,7 +102,7 @@ return function(update_freq)
end
local update = function(cr)
local read_byte_cnt, write_byte_cnt = read_stat_file()
local read_byte_cnt, write_byte_cnt = read_devices()
update_stat(cr, reads, read_byte_cnt)
update_stat(cr, writes, write_byte_cnt)
end