I work in a system that does not allow me to enable tracepoints at runtime. To work around this, I manually add printks near a trace point to during debugging. This seems to be very inefficient and I am looking for methods to enable a tracepoint at compile time and have it pushed to the kernel log ring buffer.
Best way to convert a Linux kernel trace point into a plain old printk
135 Views Asked by sidcha At
1
There are 1 best solutions below
Related Questions in LINUX-KERNEL
- Android kernel error: undefined reference to `get_hw_version_platform'
- Is there a need for BPF Linux namespace?
- Facing fatal errors while running "yum update" command on CentOS 7/Cloudlinux 7
- crash utility itself crashes while decoding kdump generated from null pointer dereference in kernel module
- How to compile the Linux kernel with -O0 for more detailed debug?
- Linux support for parallel Pixel data Image sensor
- Can't upgrade to newest version of linux-image-6.5.0-26-generic
- How to protect a page so that it cannot be write in mips arch?
- How to extract the .img file into normal kernel source file in the linux?
- Storage size of struct hash_desc desc; isn't known
- How can I intercept failed file openning calls?
- struct nameidata-Linux Kernel Module
- How to modify a 'struct msghdr' in Linux Kernel Module?
- How to allocate 500MB+ physically contiguous memory in a Linux kernel module and copy data to that memory from a userspace process?
- Hyper Threading: nosmt in grub configuration
Related Questions in SYSLOG
- How to send message to syslog agent in plsql
- Is there any way to remove log.syslog.structured_data field in logscale/kibana
- rsyslog - Turning $RepeatedMsgReduction off completely
- nginx logs (rsyslog) not going through vector.dev
- How can I extract a specific part with grep in Linux between multiple double quotes?
- Rsyslog cannot parse escaped JSON log record?
- Intermittent Syslog Messages Missing with Log4j2
- Why am I seeing entries in journalctl like "sshd[144488]: fatal: Timeout before authentication for 51.89.14.103 port 42396"?
- What happens to syslog if i lock /var/log/messages with fcntl. Will the logs be permanently lost or rsyslog will wait for fcntl to unlock messages?
- How to add timeout while sending logs to remote syslog server?
- In samba can vfs FULL_AUDIT be configured not to use syslog
- Configure Vertica DB log to send syslog server
- rsyslog templates with custom variables doesnt work
- Kibana dashboard not rendred
- How to view short log files on windows?
Related Questions in PTRACE
- How to know if a syscall returned an error?
- Setup a watchpoint/breakpoint over a range of addresses with ptrace
- Problems with finding out file path via descriptor
- Trace all threads of a non-child process reliably and transparently with ptrace
- Does tgkill interrupt tasks currently executing a system call, effectively aborting it like ptrace does?
- PTRACE_GETSIGINFO si_code for breakpoint doesn't match with siginfo.h definition
- How to resume main thread/process while tracing syscalls and cloned process with ptrace()
- Reading a process' memory using ptrace but with restrictions
- GDB crashes debugging x86 binary under Rosetta 2 + Apple Virtualization Framework
- How do I monitor a specific process file read/writes on android?
- How do I test that a given shell has been executed in Python?
- ptrace not recording forked process despite setting PTRACE_SETOPTIONS to PTRACE_O_TRACEFORK
- How to solve "ptrace operation not permitted"?
- Is there a way to be able to quickly differentiate between a SIGTRAP caused by a breakpoint or a sigtrap caused by PTRACE?
- is it possible to use the ptrace to simulate the IO error on the specific lba range when running the FIO/Vdbench on the block device
Related Questions in FTRACE
- why does mcount require frame pointer information?
- Linux FTRACE function_graph process context
- ftrace into serial console during reboot
- File is cleared after preventing writing to it by hooking sys_write
- How to benchmark a C program
- Multi program use ftrace to hook same kernel function in same machine
- trace-cmd & ftrace: print only trace_printk output
- Systrace: When I open the systrace, I found that the information of SurfaceFlinger is not full，I just see a few information shown
- Using ftrace on Samsung smartphone
- How to use ftrace to print partial function trace?
- It is possible to grab process memory using ftrace?
- How to configure Ftrace on kernel 5.15.0-56-generic (ubuntu 22.04)?
- How can I use ftrace filtering to see the call stack above a function?
- What does the field irq indicate in the kvm_inj_virq event?
- How can I parse the output of trace-cmd report using awk?
Related Questions in PRINTK
- printk outputs only timestamp and does not print the message
- How to track a parameter in the Linux kernel efficiently?
- Android kernel printk() and clock_gettime(CLOCK_BOOTTIME) time reversal of 60ms
- Is printk() deprecated?
- how to perform arithmetic on fractions in a Linux module
- How to use printk to print a physical address (aka phys_addr_t)?
- Best way to convert a Linux kernel trace point into a plain old printk
- How to know the control flow during transition in state-machine?
- OpenvSwitch building, installation and testing problem
- how to write logs to specific file from kernel space?
- RPi4 : Device Driver - pr_info with float causing build error
- How to make printk in my module show messages on serial consoles regardless of the value of boot parameter console=
- Using printk in tracepoint causes the system to freeze
- Can a Linux process/thread terminate without pass through do_exit()?
- copy_to_user() keeps printing message infinitely
Trending Questions
- UIImageView Frame Doesn't Reflect Constraints
- Is it possible to use adb commands to click on a view by finding its ID?
- How to create a new web character symbol recognizable by html/javascript?
- Why isn't my CSS3 animation smooth in Google Chrome (but very smooth on other browsers)?
- Heap Gives Page Fault
- Connect ffmpeg to Visual Studio 2008
- Both Object- and ValueAnimator jumps when Duration is set above API LvL 24
- How to avoid default initialization of objects in std::vector?
- second argument of the command line arguments in a format other than char** argv or char* argv[]
- How to improve efficiency of algorithm which generates next lexicographic permutation?
- Navigating to the another actvity app getting crash in android
- How to read the particular message format in android and store in sqlite database?
- Resetting inventory status after order is cancelled
- Efficiently compute powers of X in SSE/AVX
- Insert into an external database using ajax and php : POST 500 (Internal Server Error)
Popular # Hahtags
Popular Questions
- How do I undo the most recent local commits in Git?
- How can I remove a specific item from an array in JavaScript?
- How do I delete a Git branch locally and remotely?
- Find all files containing a specific text (string) on Linux?
- How do I revert a Git repository to a previous commit?
- How do I create an HTML button that acts like a link?
- How do I check out a remote Git branch?
- How do I force "git pull" to overwrite local files?
- How do I list all files of a directory?
- How to check whether a string contains a substring in JavaScript?
- How do I redirect to another webpage?
- How can I iterate over rows in a Pandas DataFrame?
- How do I convert a String to an int in Java?
- Does Python have a string 'contains' substring method?
- How do I check if a string contains a specific word?
You can use the kernel kprobes to dynamically register probe functions into the kernel. probe functions are just kernel modules that are dynamically inserted into your kernel and from there you can print to ring buffer. kprobes are automatically enabled on nearly all major linux distro's by default. see the documentation to know how to register and unregister kprobes.