INFO: rcu_sched detected expedited stalls on CPUs/tasks: { 7-... } 21119 jiffies s: 73 root: 0x2/. 这表明 CPU 7 未能响应重新调度 IPI。 CPU 编号后面的三个句点 (“.”) 表示 CPU 处于联机状态(否则第一个周期将改为“O”),CPU 在加速宽限期开始时处于联机状态(否则第二个周期将改为“o...
解释RCU的CPU停顿检测器 "Splats" 对于RCU的非RCU-tasks类型,当CPU检测到它正在停止时,它将打印类似于以下内容的消息: INFO: rcu_sched detected stalls on CPUs/tasks: 2-...: (3 GPs behind) idle=06c/0/0 softirq=1453/1455 fqs=0 16-...: (0 ticks this GP) idle=81c/0/0 softirq=764/764...
294 If an expedited grace period detects a stall, it will place a message 295 like the following in dmesg: 296 297 INFO: rcu_sched detected expedited stalls on CPUs/tasks: { 7-... } 21119 jiffies s: 73 root:0x2/. 298 299 This indicates that CPU 7 has failed to respond to a res...
root@OpenWrt:/# [ 184.045603] rcu: INFO: rcu_sched detected stalls on CPUs/tasks: [ 184.051575] rcu: 3-...0: (1 ticks this GP) idle=572/1/0x4000000000000000 softirq=5076/5076 fqs=935 [ 184.060757] (detected by 0, t=2102 jiffies, g=7101, q=25) [ 184.066272] Task dump for CPU...
2. RCU (Read-Copy-Update) Stalls RCU Stalls: The message rcu_sched detected expedited stalls on CPUs/tasks indicates that the RCU subsystem detected a stall, which can be caused by long-running tasks or high CPU load. 3. Intel QAT Driver Issues QAT Driver ...
[RCUstall]RCUstall分析，RCUstall内核文档翻译 [RCUstall]RCUstall分析，RCUstall内核⽂档翻译 使⽤RCU的CPU失速检测器 本⽂档⾸先讨论RCU的CPU停顿检测器可以定位哪些问题，然后讨论可⽤于微调检测器操作的内核参数和Kconfig选项。最后，本⽂解释了失速检测器的“splat”格式。是什么导致RCU CPU停顿警告？是...
[ 259.077037][ T141] rcu: INFO: rcu_sched detected expedited stalls on CPUs/tasks: { 0-... } 15632 jiffies s: 2777 root: 0x1/. [ 259.078906][ T141] rcu: blocking rcu_node structures: [ 259.079761][ T141] Task dump for CPU 0: [ 259.080460][ T141] task:syz-executor.3 state:...
INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { P0 } 67953 jiffies s: 1039 root: 0x0/T blocking rcu_node structures: systemd-hostnamed.service: Processes still around after final SIGKILL. Entering failed mode. systemd-hostnamed.service: Unit entered failed state. ...
rcu_seq_start(&rcu_state.expedited_sequence); } /* * Return the value that the expedited-grace-period counter will have * at the end of the current grace period.*/ static __maybe_unused unsigned long rcu_exp_gp_seq_endval(void) ...
pr_err("INFO: %s detected expedited stalls on CPUs/tasks: {", rcu_state.name); Expand All @@ -647,7 +651,7 @@ static void synchronize_rcu_expedited_wait(void) } } pr_cont(" } %lu jiffies s: %lu root: %#lx/%c\n", jiffies - jiffies_start, rcu_state.expedited_sequence, j ...