Linux / Drivers / Usb
Unit Size

The distribution of size of units (measured in lines of code).

Intro
  • Unit size measurements show the distribution of size of units of code (methods, functions...).
  • Units are classified in four categories based on their size (lines of code): 1-20 (small units), 20-50 (medium size units), 51-100 (long units), 101+ (very long units).
  • You should aim at keeping units small (< 20 lines). Long units may become "bloaters", code that have increased to such gargantuan proportions that they are hard to work with.
Learn more...
Unit Size Overall
  • There are 12,165 units with 279,168 lines of code in units (71.6% of code).
    • 269 very long units (40,674 lines of code)
    • 935 long units (64,687 lines of code)
    • 3,030 medium size units (95,551 lines of code)
    • 3,319 small units (49,150 lines of code)
    • 4,612 very small units (29,106 lines of code)
14% | 23% | 34% | 17% | 10%
Legend:
101+
51-100
21-50
11-20
1-10
Unit Size per Extension
101+
51-100
21-50
11-20
1-10
c14% | 23% | 34% | 17% | 9%
h0% | 2% | 16% | 13% | 68%
Unit Size per Logical Component
primary logical decomposition
101+
51-100
21-50
11-20
1-10
gadget13% | 19% | 36% | 18% | 11%
host16% | 26% | 30% | 16% | 9%
serial17% | 22% | 34% | 18% | 7%
core19% | 18% | 30% | 20% | 11%
typec17% | 17% | 34% | 18% | 11%
dwc215% | 26% | 37% | 13% | 7%
misc16% | 31% | 28% | 13% | 9%
musb15% | 29% | 33% | 11% | 10%
storage15% | 32% | 29% | 16% | 6%
class24% | 23% | 29% | 14% | 8%
usbip17% | 19% | 35% | 18% | 8%
phy10% | 21% | 29% | 22% | 15%
chipidea11% | 11% | 44% | 17% | 13%
cdns36% | 26% | 38% | 19% | 10%
dwc35% | 21% | 40% | 20% | 12%
isp17609% | 27% | 37% | 11% | 14%
atm6% | 35% | 39% | 12% | 5%
common21% | 24% | 21% | 14% | 17%
mon13% | 10% | 41% | 21% | 12%
image13% | 39% | 22% | 18% | 6%
c67x009% | 14% | 29% | 22% | 23%
renesas_usbhs3% | 10% | 37% | 26% | 22%
mtu30% | 16% | 44% | 22% | 17%
early0% | 26% | 42% | 24% | 6%
ROOT0% | 52% | 20% | 13% | 14%
roles0% | 27% | 19% | 32% | 20%
Alternative Visuals
Longest Units
Top 50 longest units
Unit# linesMcCabe index# params
1915 1 2
754 200 1
461 1 2
352 83 6
332 87 6
322 63 2
313 84 5
304 52 1
292 68 6
281 65 2
275 66 6
269 66 1
258 59 2
235 66 2
234 59 6
230 58 2
229 62 6
229 56 5
216 62 6
213 23 2
211 1 3
208 53 2
204 44 2
201 56 2
198 34 2
196 117 2
185 47 3
183 50 1
182 36 3
181 57 6
181 35 1
181 34 3
180 32 7
180 48 3
180 18 3
179 48 1
179 30 5
178 40 2
177 41 5
176 55 2
174 52 4
172 37 2
171 44 2
170 38 3
168 36 3
168 44 2
167 47 1
167 55 2
167 54 1
167 28 2