kernel文件动态调试功能 -- dynamic_debug 打开及半闭

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本文介绍如何在Android设备上通过ADB命令开启内核动态调试功能，详细展示了如何使用echo命令控制动态调试的文件模块，并提供了修改Kernel日志级别的方法。此外，还介绍了保存内核和用户日志的过程。

转载地址：https://blog.youkuaiyun.com/kentas_dxpc/article/details/49679269

Kernel def_config中需要打开以下两个宏

CONFIG_DEBUG_FS=y

CONFIG_DYNAMIC_DEBUG=y

(1)step1:open pr_debug
adb root
adb remount
adb shell

打开动态调试

#echo 'file sprdfb_main.c +p' > /sys/kernel/debug/dynamic_debug/control
#echo 'file lcdc.c +p' > /sys/kernel/debug/dynamic_debug/control
#echo 'file sprdfb_dispc.c +p' > /sys/kernel/debug/dynamic_debug/control

#echo 'file sprd-core.c +p' > /sys/kernel/debug/dynamic_debug/control

关闭动态调试

#echo 'file sprdfb_main.c -p' > /sys/kernel/debug/dynamic_debug/control
#echo 'file lcdc.c -p' > /sys/kernel/debug/dynamic_debug/control
#echo 'file sprd-corec.c -p' > /sys/kernel/debug/dynamic_debug/control

sprdfb_main.c

pr_debug(KERN_INFO "sprdfb: [%s]: FBIO_WAITFORVSYNC\n", __FUNCTION__);

Sprd-core.c

pr_debug("%s: starting CMD%u arg %08x flags %08x\n",

mmc_hostname(host), mrq->cmd->opcode,

mrq->cmd->arg, mrq->cmd->flags);

stop logs4android
(2)step2:save log
save both kernel log(cat proc/kmsg) && user log(logcat -v time)

Log:

[c0] sprdfb: 6sprdfb: [sprdfb_ioctl]: FBIO_WAITFORVSYNC

[c0] sprdfb: 6sprdfb: [sprdfb_ioctl]: return 0

[c0] mmc0: starting CMD13 arg 00010000 flags 00000195

[c0] mmc0: req done (CMD13): 0: 00000900 00000000 00000000 00000000

如果需要修改Kernel log level

则

cat /proc/sys/kernel/printk

7 4 1 7

echo 8 4 1 7 > /proc/sys/kernel/printk

#define KERN_EMERG KERN_SOH "0" /* system is unusable */

#define KERN_ALERT KERN_SOH "1" /* action must be taken immediately */

#define KERN_CRIT KERN_SOH "2" /* critical conditions */

#define KERN_ERR KERN_SOH "3" /* error conditions */

#define KERN_WARNING KERN_SOH "4" /* warning conditions */

#define KERN_NOTICE KERN_SOH "5" /* normal but significant condition */

#define KERN_INFO KERN_SOH "6" /* informational */

#define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
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作者：kentas_dxpc
来源：优快云
原文：https://blog.youkuaiyun.com/kentas_dxpc/article/details/49679269
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