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Why does kworker hog your CPU? To find out why a kworker is wasting your CPU, you can create CPU backtraces: watch your processor load (with top or something) and in moments of high load through kworker, execute echo l > /proc/sysrq-trigger to create a backtrace. (On Ubuntu, this needs you to login with sudo -s). Do this several times, then watch the backtraces at the end of dmesg output. See what happens frequently in the CPU backtraces, it hopefully points you to the source of your problem.
Example: e1000e. In my case, I found a backtrace like this nearly every time:
代码语言：javascript复制Call Trace:
delay_tsc 0x4a/0x80
__const_udelay 0x2c/0x30
e1000_acquire_swflag_ich8lan 0xa2/0x240 [e1000e]
e1000e_read_phy_reg_igp 0x29/0x80 [e1000e]
e1000e_phy_has_link_generic 0x85/0x120 [e1000e]
e1000_check_for_copper_link_ich8lan 0x48/0x930 [e1000e]
e1000e_has_link 0x55/0xd0 [e1000e]
e1000_watchdog_task 0x5e/0x960 [e1000e]It hinted me to a problem in the e1000e Ethernet card module, and indeed a sudo rmmod e1000e made the high CPU load go away immediatel
先清理dmesg
adb shell
dmesg -c
再开始测试并且出现问题时执行
adb shell
echo l > /proc/sysrq-trigger
再执行
dmesg
hdd_update_dbs_scan_ctrl_ext_flag: 617: DBS scan duty cycle is disabled [ 675.311466] IRQ5 no longer affine to CPU5 [ 690.351261] IRQ5 no longer affine to CPU4 [ 705.321534] IRQ5 no longer affine to CPU7 [ 723.194943] sysrq: SysRq : Show backtrace of all active CPUs Back trace起始点 [ 723.195033] Backtrace for cpu 1 (current): [ 723.195083] CPU: 1 PID: 12445 Comm: sh Tainted: P W O 4.4.78-perf #1 [ 723.195106] Hardware name: SoMC Maple-DSDS(MSM8998 v2.1) (DT) [ 723.195130] Call trace: [ 723.195193] [<ffffff9746a89bc8>] dump_backtrace 0x0/0x1fc [ 723.195228] [<ffffff9746a89ed0>] show_stack 0x14/0x1c [ 723.195271] [<ffffff9746db8ecc>] dump_stack 0x8c/0xac
——————————————————————————————————————————–
要知道任何kworker在做什么，你可以看看cat /proc/<kworker_pid>/stack
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