Only print the logs of KERN_WARNING in the kernel ring buffer. Another option is dynamic debug by configuring the debugfs enable it in kernel : CONFIG_DYNAMIC_DEBUG=y menuconfig using pr_debug(), dev_dbg() ... in driver source code echo “<matches> <ops><flags>” > <debugfs>/dynamic...
\ no_printk(KERN_DEBUG KLOG_MODNAME pr_fmt(fmt), ##__VA_ARGS__) #endif #include <linux/dynamic_debug.h> /* If you are writing a driver, please use dev_dbg instead */ #if defined(CONFIG_DYNAMIC_DEBUG) /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here...
make -C $(KERNEL_DIR) CROSS_COMPILE=$(CROSS_COMPILE) KBUILD_OUTPUT=$(KERNEL_OUT_DIR) ARCH=$(BOARD_ARCH) $(KERNEL_D - make -C $(KERNEL_DIR) CROSS_COMPILE=$(CROSS_COMPILE) KBUILD_OUTPUT=$(KERNEL_OUT_DIR) ARCH=$(BOARD_ARCH) $(KERNEL_T + make -C $(KERNEL_DIR) CROSS_COMPILE=$(...
printk_ratelimit函数(kernel建议用printk_ratelimited代替)通过跟踪发送到控制台的消息数量工作,如果输出的速度超过一个阈值,printk_ratelimit函数将返回零。从而避免发送重复消息。printk_ratelimit函数返回非零值表示我们可以继续打印,否则就应该跳过。 修改/proc/sys/kernel/printk_ratelimit(在重新打开消息之前应该等待的...
This blog entry provides a step by step video and links to associated document with instructions for installing and running the QDMA Linux Kernel driver. It also provides some debug information. It should be used in conjunction with the ‘read me’ file and documentation that comes with the dri...
This lab provides hands-on exercises that demonstrate how to debug the Sysvad audio kernel-mode device driver.Microsoft Windows Debugger (WinDbg) is a powerful Windows-based debugging tool that you can use to perform user-mode and kernel-mode debugging. WinDbg provides source-level debugging for ...
查看具体的泄漏点 /test # cat /sys/kernel/debug/slab/kmalloc-128/alloc_traces 100000 kmalloc_leak.constprop.0+0x54/0x80 [kmemleak_driver] age=12920/12945/12972 pid=95 cpus=3 __kmem_cache_alloc_node+0xf4/0x2a4 kmalloc_trace+0x20/0x2c kmalloc_leak.constprop.0+0x54/0x80 [kmemleak_...
This lab provides hands-on exercises that demonstrate how to debug the Sysvad audio kernel-mode device driver.Microsoft Windows Debugger (WinDbg) is a powerful Windows-based debugging tool that you can use to perform user-mode and kernel-mode debugging. WinDbg provides source-level de...
printk("unregister probe jffies driver.\n"); return; } module_init(kprobe_jiffies_init); module_exit(kprobe_jiffies_exit); MODULE_AUTHOR("xxx"); MODULE_DESCRIPTION("kernel probe driver"); MODULE_LICENSE("GPL"); 1. 2. 3. 4.
在这种状况下,我们只能通过日志或者到宿主机上通过 docker-cli 或 nsenter 来排查问题,效率很低,在K8s环境部署应用后,经常遇到需要进入pod进行排错。除了查看pod logs和describe方式之外,传统的解决方式是在业务pod基础镜像中提前安装好procps、net-tools、tcpdump、vim等工具。但这样既不符合最小化镜像原则,又徒增Pod...