static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask) { returntest_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask)); } 在调用test_and_set_bit之前,有两个宏对 cpu 和 cpumask 进行了处理。 cpumask_check是一个内联函数,检查传入的 cpu 参数是否大于了NR_CPUS...
0) | __irq_set_affinity() { 0) 0.438 us | irq_to_desc(); 0) 0.667 us | _raw_spin_lock_irqsave(); 0) | irq_set_affinity_locked() { 0) | irq_do_set_affinity() { 0) | msi_domain_set_affinity() { 0) | its_set_affinity() { 0) 0.625 us | its_dec_lpi_count.isra...
cpumask_set_cpu(cpu,&__cpu_possible_mask);elsecpumask_clear_cpu(cpu,&__cpu_possible_mask); } 上面是设置cpu1-cpu3的__cpu_possible_mask bit,cpu0(boot cpu)的这个bit是在如下函数里设置的: 4.19/kernel/cpu.c void__init boot_cpu_init(void) {intcpu =smp_processor_id();/*Mark the boo...
内核中对bitmap的一些基本操作: set_bit(nr, *addr) 将addr的第nr位置为1 假设*addr = 0, nr = 3;则执行结果为1000(二进制数) cpumask_set_cpu(unsignedintcpu,structcpumask*dstp) 该函数调用set_bit()将dstp指向的cpumask的第cpu位置1 test_bit() 测试指定的bit位是否为1 cpumask_test_cpu(intcpu...
cpumask_set_cpu(cpu,&__cpu_active_mask);elsecpumask_clear_cpu(cpu,&__cpu_active_mask); } 调用路径: cpuhp_hp_states[CPUHP_AP_ACTIVE].startup.single//kernel/cpu.c cpu hotplug回调resume_cpus(structcpumask *cpus)//kernel/cpu.c GPL导出的接口,目前只在core_ctl模块中使用sched_cpus_activat...
在Linux内核中,CPU掩码(cpumask)用于表示一组CPU编号,常用于描述进程或任务的亲和性、中断或定时器的分配范围等场景。
* cpu_online_mask/cpu_possible_mask等为const (替换的是存在指针的cpu_online_map/cpu_possible_map)。这意味着只有很少数的情况操作cpu, 否则可以使用新增的set_cpu_online()/set_cpu_possible()或init_cpu_online()/init_cpu_possible() 函数。
on GitHub How to Set the CPU Affinity of a Windows Process Permanently The best way to set a CPU affinity permanently on Windows is to use Process Lasso. The custom CPU affinity will be applied each time the process is run. Download Process Lasso Process
* Return: >= nr_cpu_ids if no cpus set in all. */ static inline unsigned int cpumask_first_and_and(const struct cpumask *srcp1, const struct cpumask *srcp2, const struct cpumask *srcp3) { return find_first_and_and_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), cpumask_bits(...
Development version of the Upstream MultiPath TCP Linux kernel 🐧 - cpumask: introduce for_each_cpu_or · multipath-tcp/mptcp_net-next@1470afe