1\ingroup GroupModules Modules 2\defgroup GroupTrafficCop Traffic Cop 3 4Copyright (c) 2021, Arm Limited and Contributors. All rights reserved. 5 6# Traffic Cop 7 8## Overview 9Traffic Cop is a performance plugin module. It imposes limitations on 10performance according to the platform electric capabilities. 11 12The limitation can be configured based on the number of active cores for each 13domain. In this case, a domain could be a group of cores supplied by the same 14power rail. The configuration is a simple lookup table that maps the number of 15active cores and the maximum performance level allowed as shown here. This table 16is called the Performance Constraint Table or PCT. 17 18This PCT table is an example of 4 cores domain: 19 20| Number of cores online | perf limit | 21| :---: | :---: | 22| 4 | 2000 | 23| 3 | 2500 | 24| 2 | 3000 | 25 26 27## Configuration Example 28 29```config_traffic_cop.c``` 30 31```C 32static struct mod_tcop_pct_table pct[] = { 33 { .cores_online = 4, 34 .perf_limit = 2000, 35 }, 36 { .cores_online = 3, 37 .perf_limit = 2500, 38 }, 39 { .cores_online = 2, 40 .perf_limit = 3000, 41 }, 42 { 0 }, 43}; 44``` 45 46NOTE: The table must be provided in descending order, starting with the highest 47number of cores allowed. 48