kworker

Kernel: 3.8.13Arm:ibox 4412Camera resolution 640x480160000 (1.6G) at 4 full-core,echo peformance > Scaling_governormem:58220k used, 969844K free, 0K shrd, 268K buff, 2524K cachedcpu:49.7% usr 1.4% sys 0.0% nic 48.7% idle 0.0% io 0. 0% IRQ 0.0% sirqload average:1.01 0.67 0.30 2/59 1427 PID PPID USER STAT VSZ%vsz CPU%cpu COMMAND 1412 1399 0 R 5004 0.4 0 49.7/cam_previewfb0v3 1427 1399 0 R 2392 0.2 1 1.4 top-d1 1399 1 0 S 2392 0.2 0 0.0-/bin/sh 1 0 0 S 2388 0.2 3 0.0 init 372 2 0 SW

Linux view each process in the system[emailprotected]:~$ ps-a PID TTY time CMD 1? 00:00:01 Init 2? 00:00:00 Kthreadd 3? 00:00:00 ksoftirqd/0 4? 00:00:00 kworker/0:0 5? 00:00:00 kworker/0:0h 6? 00:00:00 kworker/u8:0 7? 00:00:02 rcu_sched 8? 00:00:00 rcuos/0 9? 00:00:00 RCUOS/1 10? 00:00:01 RC

The experiments involved in this article are blog http://blog.csdn.net/tianshuai11/article/details/7465587For example, read the above blog and digest the following example. I. Module Method Jiq. c # Include Makefile KERNELDIR ?= /lib/modules/$(shell uname -r)/build PWD := $(shell pwd)obj-m := jiq.o modules:$(MAKE) -C $(KERNELDIR) M=$(PWD) modulesclean:rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions.PHONY: modules modules_install clean Test: Root @ Ubuntu :~ /Desktop/jiq # Make Ro

crashkernel = auto lang = en kernel = volgroup/lv_root keyboardtype = pc keytable = US rd_no_dm rhgb quiet Initrd/initramfs-3.2.84.img Note: isolcups must be followed by root and cannot be placed at the end (for personal testing, the specific reasons need to be identified) (2) check whether the isolation is successful: [[Email protected] ~] # Ps-elo psr, argS | awk '{if ($1 = 3) Print $0 }' 3 [kworker/u: 0] 3 [migration/3] 3 [

Rtpreempt howtoYang honggang -------------------------Ref: https://rt.wiki.kernel.org/index.php/RT_PREEMPT_HOWTO#Getting_the_Sources------------------------------------------------------------------------------- 1.$ Tar-jxf linux-3.10.6.tar.xz 2. Patch$ Linux-3.10.6 CD$ Xzcat ../patch-3.10.6-rt3.patch.xz | patch-p1 3. config$ Make defconfig$ Make menuconfig (X) fully preemptible kernel (RT) // config_preempt_rt_full... 4. Make$ Make-J8# Make modules_install# Make install 5. Reboot# Reboot 6.$ Un

:00:00 Kthreadd 3? 00:00:00 ksoftirqd/0 6} 00:00:00 kworker/0:0 5? 00:00:00 kworker/u:0 4} 00:00:00 migration/0 7? 00:00:00 MIGRATION/1 8? 00:00:00 kworker/1:0 9? 00:00:00 KSOFTIRQD/1 10? 00:00:00 kworker/0:1 ... Omit partial results 2. Display the specified user process The code is as follows: fdipzone@ubu

gnome-setti+ 3044 root 0 377916 18660 14776 S 0.3 1.0 0:04.27VMTOOLSD4276 Root 0 157708 2256 1556 R 0.3 0.1 0:00.26Top1 root 0 128092 6692 3944 S 0.0 0.4 0:02.37systemd2 Root 0 0 0 0 S 0.0 0.0 0:00.00Kthreadd3 Root 0 0 0 0 S 0.0 0.0 0:00.16 ksoftirqd/06 Root 0 0 0 0 S 0.0 0.0 0:00.18 kworker/u12+ 7 root rt 0 0 0 0 S 0.0 0.0 0:00.00 migration/08 Root 0 0 0 0 S 0.0 0.0 0:00.00RCU_BH9 Root 0 0 0 0 S 0.0 0.0 0:00.77rcu_schedRoot RT 0 0 0 0 S 0.0 0.0 0:00

=64 time=0.036 ms---192.168.102.4 ping statistics---3 Packets transmitted, 3 received, 0% packet loss, time 2000msRTT Min/avg/max/mdev = 0.019/0.026/0.036/0.008 msUID PID PPID C stime TTY time CMDRoot 1 0 0 January 07? 00:00:36/usr/lib/systemd/systemd--switched-root--system--deserialize 19Root 2 0 0 January 07? 00:00:00 [Kthreadd]Root 3 2 0 January 07? 00:00:08 [ksoftirqd/0]Root 5 2 0 January 07? 00:00:00 [kworker/0:0h]Root 7 2 0 January 07? 00:00:08

activate this console. Processing/etc/profile... Done [[Email protected]/] # ps PID user vsz STAT command 1 root 3152 s {linuxrc} init 2 root 0 SW [kthreadd] 3 root 0 SW [ksoftirqd/0] 4 root 0 SW [kworker/0: 0] 5 root 0 SW [kworker/u: 0] 6 root 0 SW 7 root 0 SW [kworker/u: 1] 147 root 0 SW [sync_supers] 149 root 0 SW [BDI-default] 150 root 0 SW 161 root 0 SW [kh

3602 gino 20 0 91844 15m 10m S 2 0.8 0:00.45 gnome-terminal 1 root 20 0 3644 1968 1280 S 0 0.1 0:00.80 init 2 root

Buff/cachekib swap:0 Total, 0 free, 0 used. 421600 avail Mem PID USER PR NI VIRT RES SHR S%cpu%MEM time+ COMMAND 1017 Root 20 0 1006112 15304 10308 s 0.3 1.5 23:30.54 staragent-c+ 1047 root 0 130484 12840 8848 S 0.3 1.3 3:50.11 Aliyundu N 1 Root 0 43204 3596 2412 s 0.0 0.4 0:04.26 systemd 2 root 0 0 0 0 S 0.0 0.0 0:00.01 Kthreadd 3 Root 0 0 0 0 S 0.0 0.0 0:02.72ksoftirqd/0 5 root 0-20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0h 7 root RT 0 0 0 0 S 0.0

queue One or more protocol drivers can request multiple Spi_message requests at the same time to the controller driver, and these spi_message are also in the form of a linked list below the queue field that represents the spi_master structure of the controller:struct Spi_master { struct device dev; ...... BOOL queued; struct Kthread_worker kworker; struct task_struct

){//get name pid of next processchar *proc_name = vmi_read_str_va(vmi, iter + name_offset - tasks_offset, 0); int pid; vmi_read_32_va(vmi, iter + pid_offset - tasks_offset, 0, pid);//print informationprintf("[%5d] %s\n", pid, proc_name);if (proc_name){free(proc_name);proc_name = NULL;}}Debug("resume vm and exit");vmi_resume_vm(vmi);vmi_destroy(vmi);return 0;} Configuration file/etc/libvmi. conf debian-pv-pv-shot1 {ostype = "Linux";sysmap = "/boot/System.map-3.1.0";linux_name = 0x2f8;linux_tasks

: observe the program f s uid pid ppid c pri ni addr sz wchan tty time spent 0 S 1000 8594 8583 0 80 0-2318 wait pts/1 00:00:00 bash0 T 1000 882 8 8594 0 80 0-12020 signal pts/1 00:00:00 vim0 R 1000 8877 8594 0 80 0-1177-pts/1 00:00:00 psF: Program permission S: Program Status R: running state, s: sleep mode, can wake up, D: Can not wake up the sleep state, such as waiting for I/OT: Stop State, Z: BotNet state, the program has been terminated but cannot be removed from the memory UID: IDPID of t

. 7868548 avail Mem PID USER PR NI VIRT RES SHR S%cpu%MEM time+ COMMAND 1855 Root 0 0 0 0 S 0.3 0.0 0:00.33 kworker/0:2 1 root 20 0 44496 7168 2612 S 0.0 0.1 0:02.32 systemd 2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd 3 Root 0 0 0 0 S 0.0 0.0 0:00.05 ksoftirqd/0 5 root 0-20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0h 6 root 0 0 0 0 S 0.0 0.0 0: 00.0

Spi_message requests to the controller at the same time, and these spi_message are also in the form of a linked list under the Queue field representing the controller's spi_master structure: struct Spi_master { struct device dev; ...... BOOL queued; struct Kthread_worker kworker; struct task_struct *kworker_task; struct kthread_work pump_m

information about the PIDAll programs of the user under the PS au display terminalrunning an instanceExample One: Ps-la | More$ ps-la |moref S UID PID PPID C PRI NI ADDR SZ Wchan TTY time CMD5 20100800-13212 Ep_pol?00:02:Systemd0 20200800-0 Kthrea?00:00:XX kthreadd1 S0320800-0 Smpboo?00:00:ksoftirqd/01 S052060-20-0 worker?00:00:XX kworker/0:0H1 S0720-40--0 Smpboo?00:00:migration/01 S0820800-0 RCU_GP?00:00:XX rcu_bh0 20920800-0 rcu_no?00:00:XX rcuob/0

of the hardware schematic diagram5) Run a program with only the business logic layer code to read the ADC values and view the system status.Discover the system process status through top view a kworker process has an exception, found that the process CPU utilization is 20%~30%.Continue to find the data and discover that the kworker process is actually a kernel thread that handles queues in the kernel.Seein

1) How to view the process:Ps-ef or PS auxRoot 15087 0.0 0.0 0 0? S 23:31 0:00 [kworker/1:1]Root 15219 0.0 0.0 0 0? S 23:36 0:00 [kworker/1:0]Root 15460 0.0 0.0 0 0? S 23:41 0:00 [Kworker/1:2]Homer 15572 23.0 5.8 791472 119788? Sl 23:45 0:03/usr/lib/firefox/firefoxHomer 15590 0.1 0.1 273796 3132? Sl 23:45 0:00/usr/lib/at-spi2-core/at-spi-bus-launcherHomer 15620 0

b/S 0.00 B/S 0.00 0.03 [Kworker/0:2] 1 BE/4 root 0.00 b/S 0.00 B/s 0.00% 0.00% SYSTEMD--switched-root--system--deserialize 2 BE/4 root 0.00 b/S 0.00 B/s 0.00% 0.00% [Kthreadd] 3 BE/4 root 0.00 b/S 0.00 B/S 0.0 0% 0.00% [ksoftirqd/0] 6 BE/4 root 0.00 b/S 0.00 B/s 0.00% 0.00% [kworker/u256:0] 7 RT/4 Root 0.00 B/S 0.00 B/s 0.00% 0.00% [migration/0] 8 BE/4 root 0.00 b/S 0.00 B/s 0.00% 0.00% [RCU_BH ] 9