问题2现象:通过mpstat 查看cpu软锁中断值,发现逻辑cpu编号14和15号的soft值异常高,相对其他平均不到0.5%.idle值很低. 解决方法:开启irqbalence服务,重启主机后恢复正常.
指在irq_handle之后重新开启硬件irq的中断下半部实现，常见有
#17[ffff88407f263fb0]call_softirq at ffffffff81ac66ac---<IRQstack>---#18[ffff883f96bbb7d0]inet_csk_diag_dump at ffffffffa0174db9[inet_diag]#19[ffff883f96bbb820]inet_diag_dump_icsk at ffffffffa017580d[inet_diag]#20[ffff883f96bbb930]tcp_diag_dump at ffffffffa02110bc[tcp_diag]...
[103532.492560] BUG: soft lockup - CPU#11 stuck for 23s! [migration/11:322] [ 5078.174544] Non critical power or cooling issue cleared [103532.492578] Modules linked in: [103532.492581] pseries_energy fuse btrfs raid6_pq xor vfat msdos fat xfs libcrc32c bridge stp llc bonding uinput pserie...
__native_set_fixmap+0x24/0x40 [ 391.688327] intel_pmu_handle_irq+0xeb/0x420 [ 391.688327] perf_event_nmi_handler+0x2d/0x50 [ 391.688327] nmi_handle+0x63/0x110 [ 391.688328] default_do_nmi+0x49/0x110 [ 391.688328] do_nmi+0x1af/0x220 [ 391.688328] end_repeat_nmi+0x16/0x69 [ 391...
unsignedlongtouch_ts =__this_cpu_read(watchdog_touch_ts);structpt_regs *regs =get_irq_regs();intduration;intsoftlockup_all_cpu_backtrace =sysctl_softlockup_all_cpu_backtrace;if(!watchdog_enabled)returnHRTIMER_NORESTART;/*kick the hardlockup detector*/watchdog_interrupt_count();/*kick the...
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print_irqtrace_events(current); dump_stack(); add_taint(TAINT_SOFTLOCKUP, LOCKDEP_STILL_OK); if(softlockup_panic)//CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC_VALUE配置为1时触发softlockup panic panic("softlockup: hung tasks"); __this_cpu_write(soft_watchdog_warn,true); ...
文章提到:在开启 CONFIG_PREEMPT=y 的时候,且没有关闭本地irq的时候,在内核中断el1_irq: SYM_CODE_START_LOCAL_NOALIGN(el1_irq) kernel_entry 1 gic_prio_irq_setup pmr=x20, tmp=x1 enable_da_f mov x0, sp bl enter_el1_irq_or_nmi
常见的关闭中断的接口有:local_irq_save,local_irq_disable,disable_irq,local_bh_disable,cli(2.5版本已废除)。 3 创建watchdog $ ps aux | grep watch root 12 0.0 0.0 0 0 ? S May18 0:02 [watchdog/0] root 15 0.0 0.0 0 0 ? S May18 0:01 [watchdog/1] ...