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products/Sources/formale Sprachen/C/Linux/drivers/memory/samsung/   (Linux Kernel Version 6.17.9©)  Datei vom 24.10.2025 mit Größe 1 kB image not shown  

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governor.c


products/Sources/formale Sprachen/C/Linux/drivers/cpuidle/governor.c

/* * governor.c - governor support * * (C) 2006-2007 Venkatesh Pallipadi * Shaohua Li * Adam Belay * * This code is licenced under the GPL. */ #include #include #include #include #include #include "cpuidle.h" char param_governor[CPUIDLE_NAME_LEN]; LIST_HEAD(cpuidle_governors); struct cpuidle_governor *cpuidle_curr_governor; struct cpuidle_governor *cpuidle_prev_governor; /** * cpuidle_find_governor - finds a governor of the specified name * @str: the name * * Must be called with cpuidle_lock acquired. */ struct cpuidle_governor *cpuidle_find_governor(const char *str) { struct cpuidle_governor *gov; list_for_each_entry(gov, &cpuidle_governors, governor_list) if (!strncasecmp(str, gov->name, CPUIDLE_NAME_LEN)) return gov; return NULL; } /** * cpuidle_switch_governor - changes the governor * @gov: the new target governor * Must be called with cpuidle_lock acquired. */ int cpuidle_switch_governor(struct cpuidle_governor *gov) { struct cpuidle_device *dev; if (!gov) return -EINVAL; if (gov == cpuidle_curr_governor) return 0; cpuidle_uninstall_idle_handler(); if (cpuidle_curr_governor) { list_for_each_entry(dev, &cpuidle_detected_devices, device_list) cpuidle_disable_device(dev); } cpuidle_curr_governor = gov; list_for_each_entry(dev, &cpuidle_detected_devices, device_list) cpuidle_enable_device(dev); cpuidle_install_idle_handler(); pr_info("cpuidle: using governor %s\n", gov->name); return 0; } /** * cpuidle_register_governor - registers a governor * @gov: the governor */ int cpuidle_register_governor(struct cpuidle_governor *gov) { int ret = -EEXIST; if (!gov || !gov->select) return -EINVAL; if (cpuidle_disabled()) return -ENODEV; mutex_lock(&cpuidle_lock); if (cpuidle_find_governor(gov->name) == NULL) { ret = 0; list_add_tail(&gov->governor_list, &cpuidle_governors); if (!cpuidle_curr_governor || !strncasecmp(param_governor, gov->name, CPUIDLE_NAME_LEN) || (cpuidle_curr_governor->rating < gov->rating && strncasecmp(param_governor, cpuidle_curr_governor->name, CPUIDLE_NAME_LEN))) cpuidle_switch_governor(gov); } mutex_unlock(&cpuidle_lock); return ret; } /** * cpuidle_governor_latency_req - Compute a latency constraint for CPU * @cpu: Target CPU */ s64 cpuidle_governor_latency_req(unsigned int cpu) { struct device *device = get_cpu_device(cpu); int device_req = dev_pm_qos_raw_resume_latency(device); int global_req = cpu_latency_qos_limit(); if (device_req > global_req) device_req = global_req; return (s64)device_req * NSEC_PER_USEC; }

                                                                                                                                                                                                                                                                                                                                                                                                     

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