基于Linux 2.6.32内核进行分析,看本篇文章前,建议先看看percpu变量这篇文章 smp_processor_id()用来获取当前cpu的id,首先来看smp_processor_id的定义: # define smp_processor_id() raw_smp_processor_id
riscv - kernel - smp_processor_id https://mp.weixin.qq.com/s/cw5F3tIEdn5dx64XzCmo7Q 简单介绍smp_processor_id相关的内容。 本文目录: 1. secondary processors开始执行 2. smp_processor_id() 3. current_thread_info()->cpu何时赋值 4. __cpu_up_task_pointer 5. smp_callin 以下正文: 1. ...
如果smp_processor_id()在可抢占上下文中被调用,它可能返回的不是调用它的CPU的ID,而是被抢占后执行它的CPU的ID。 3. 用户遇到的bug的具体表现和可能的原因 从提供的错误日志来看,用户遇到的bug表现为在调用zpool import时,内核日志中出现了“BUG: using smp_processor_id() in preemptible”的错误消息。这表明...
1. secondary processors开始执行 2. smp_processor_id() 3. current_thread_info()->cpu何时赋值 4. __cpu_up_task_pointer 5. smp_callin 以下正文: 1. secondary processors开始执行 在head.S中定义的启动流程中,落选的cpu跳转到.Lsecondary_start处执行: .Lsecondary_start的定义如下: 其中: a. 把.L...
cpusmp_setup_processor_id 被执行多次 cpuidle解决什么问题 在计算机系统中,CPU的功能就是不断地取指、译码、执行,那如果CPU没有程序要执行,CPU不需要执行计算任务,也不需要响应外部中断事件,CPU要怎么办?在Linux kernel中,这种CPU的无所事事的状态,被称作idle状态,而cpuidle framework,就是为了管理这种状态。
cpu_cur=smp_processor_id(); policy=cpufreq_cpu_get(cpu_cur); if(!policy) { dev_err(dev,"cpu%d policy NULL\n",cpu_cur); Expand DownExpand Up@@ -1443,7 +1443,6 @@ static int rockchip_dmcfreq_target(struct device *dev, unsigned long *freq, ...
Running RancherOS in a docker swarm with three manager nodes (Raspberry Pi 3). I get tons of kernel errors like this: [ 129.901445] BUG: using smp_processor_id() in preemptible [00000000] code: node/1877 [ 129.901469] caller is debug_smp_processor_id+0x1c/0x28 [ 129.901482] CPU: 3...
n-processor sets in the SMP cluster based on the introduction to traditional and node-oriented speedup definitions, propose a corresponding speedup definition, optimal-processor-set speedup, in both theoretical and practical views, and illustrate its benefits by an example executing on two SMP ...
+++ b/lib/smp_processor_id.c @@ -22,7 +22,7 @@ notrace unsigned int debug_smp_processor_id(void) * Kernel threads bound to a single CPU can safely use * smp_processor_id(): */ - if (cpus_equal(current->cpus_allowed, cpumask_of_cpu(this_cpu))) ...
> on Arch Linux 5.2.11 with wpa_supplicant 2.8 / 2.9 our systems > increasingly show this issue: > > [72770.969617] BUG: using smp_processor_id() in preemptible [00000000] > code: wpa_supplicant/16207 > [72770.969638] caller is ieee80211_xmit_fast_finish+0x5a/0x1e0 [mac80211] ...