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1 | TMON - A Monitoring and Testing Tool for Linux kernel thermal subsystem | ||
2 | |||
3 | Why TMON? | ||
4 | ========== | ||
5 | Increasingly, Linux is running on thermally constrained devices. The simple | ||
6 | thermal relationship between processor and fan has become past for modern | ||
7 | computers. | ||
8 | |||
9 | As hardware vendors cope with the thermal constraints on their products, more | ||
10 | and more sensors are added, new cooling capabilities are introduced. The | ||
11 | complexity of the thermal relationship can grow exponentially among cooling | ||
12 | devices, zones, sensors, and trip points. They can also change dynamically. | ||
13 | |||
14 | To expose such relationship to the userspace, Linux generic thermal layer | ||
15 | introduced sysfs entry at /sys/class/thermal with a matrix of symbolic | ||
16 | links, trip point bindings, and device instances. To traverse such | ||
17 | matrix by hand is not a trivial task. Testing is also difficult in that | ||
18 | thermal conditions are often exception cases that hard to reach in | ||
19 | normal operations. | ||
20 | |||
21 | TMON is conceived as a tool to help visualize, tune, and test the | ||
22 | complex thermal subsystem. | ||
23 | |||
24 | Files | ||
25 | ===== | ||
26 | tmon.c : main function for set up and configurations. | ||
27 | tui.c : handles ncurses based user interface | ||
28 | sysfs.c : access to the generic thermal sysfs | ||
29 | pid.c : a proportional-integral-derivative (PID) controller | ||
30 | that can be used for thermal relationship training. | ||
31 | |||
32 | Requirements | ||
33 | ============ | ||
34 | Depends on ncurses | ||
35 | |||
36 | Build | ||
37 | ========= | ||
38 | $ make | ||
39 | $ sudo ./tmon -h | ||
40 | Usage: tmon [OPTION...] | ||
41 | -c, --control cooling device in control | ||
42 | -d, --daemon run as daemon, no TUI | ||
43 | -l, --log log data to /var/tmp/tmon.log | ||
44 | -h, --help show this help message | ||
45 | -t, --time-interval set time interval for sampling | ||
46 | -v, --version show version | ||
47 | -g, --debug debug message in syslog | ||
48 | |||
49 | 1. For monitoring only: | ||
50 | $ sudo ./tmon | ||