Getting error when trying to compile linux kernel
Hi this is my first question and i sorry for probably mistakes that i havei try to compile linux kernel in fedora 32 and i get errori type these commands on terminalmkdir...
View ArticleMonitoring wait time for locks used by a particular process in Linux
I'm attempting to evaluate whether a particular process is suffering a lot of lock contention among itsmany threads. This would be an external observation so I cannot add code to the process itself to...
View ArticleI'm doing womething wrong when iterating the kernel linked lists
Thanks to this awesome answer I have mostly got how the Linux kernel linked lists work. However, the code examples in the answer are not 100% clear, and based on those alone I have written some code...
View ArticleInvalid argument" setting key "net.core.somaxconn"
I tried setting Linux kernel. After editing /etc/sysctl.conf and executing the sysctl -pit shows errorInvalid argument" setting key "net.core.somaxconn"Linux distribution: Ubuntu 12.04.4 LTS, x86_64,...
View ArticleWhat happens to a process running in a CPU when it goes offline
I make certain CPUs to go offline using the commandecho 0 > /sys/devices/system/cpu/cpu$cpu/onlinePost which my nproc, grep "processor" /proc/cpuinfo and lscpu confirms that the CPU is offline. In...
View ArticlePrint Kconfig Help for all enabled drivers
I have a kernel from a development kit that I am trying to clean up to eventually use for a production system. I want to remove as many drivers from the .config as possible, but I don't know what many...
View ArticleWindows 10 is not booting. Entering in rescue mode [closed]
Actually i am using Windows 10 and Ubuntu in my laptop yesterday windows os was updating and during that process it was restarting several times. While restarting 2nd/3 rd time grub ran into problem. I...
View ArticleHow to invert spin_lock_init
I'm trying to understand how to use the Linux kernel spinlocks. From reading the header, I think I have to first declare one and initialize it like this with spin_lock_init:spinlock_t...
View ArticleCan I allocate memory from the kernel and release it from userspace?
I've read here that you can read kernel memory if you disable the address validity checks, but that's not what I want to do.I want to return some strings from the kernel to the userspace, and not being...
View ArticleKernel Objects and its control
I am beginner in Linux and Kernel development. I had attended several interviews and in most of the interviews, some set of questions were asked about the control of Kernel objects.Who controls the...
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What is the relationship between framebuffer, VT, and tty?
I'm now studying what is the mechanism behind Ctrl+Alt+F1~F7.I found some infomation talk about framebuffer, VT, and tty. I know framebuffer is an anstraction to graphic card manipulation and tty(and...
View ArticleLinux kernel module - getting execve program name using kprobe hook fails but...
I'm trying to capture program name passed to execve syscall within my kernel module. When hooking syscall_table[__NR_execve] directly, regs->di contains the proper __user char* filename, which I'm...
View ArticleDo workqueues and tasklets have priority assigned to them?
I am asking this in the context of RT-preemptive option in linux kernel.I am speculating that with CONFIG_RT_PREEMPTIVE option in linux kernel,the context switching will be real time i.e. it will try...
View Articlewhat interrupt I should see in linux to see whenever the context switch happens?
I am looking into cat /proc/interrupts and I am looking for the name of the interrupt I should look for whenever context switching happens? Where can I see the counts of interrupts when the context...
View Articlehow to write mouse program in linux
I have tried to write a program which will detect the mouse movement. But it is showing error while running in linux environment. i also want to implement the program where if user move the mouse in x...
View ArticleSoftware multiplexing-demultiplexing the serial port
everyoneI have two boards and they are connected using a UART connection (TX, RX, CTS, RTS). The problem is that I have 2 processes that needs to use the same serial port. Graphically, the problem...
View ArticleSELinux - how do I call my custom interface?
I wrote a new policy contains new type definition (.te) and interface method (.if):.te file:policy_module(dummy, 1.0.0)type dummy_t;files_type(dummy_t).if file:## <summary>## Do Bla bla##...
View ArticleWhy does my /proc/kallsyms file not contain all the symbols in System.map?
I saw from this SO post that /proc/kallsyms should have the symbols of dynamically loaded modules as well as static code whereas System.map contains only the symbols of static code. However, when I cat...
View ArticleUbuntu 20.4 USB-C to HDMI adapter stoped working after reboot
Hi Just installed the newest version of Ubuntu LTS release on my ThinkpadT480s and somehow my second Monitor which is connected by a USB-c to HDMI adapter is not working. Right after installation, it...
View ArticleOOM killer: Does oom_score_adj=-1000 still prevent killing?
have a task that must not be killed in case of an OOM. In order to prevent that, I periodically write a -1000 in /proc/[PID]/oom_score_adj.However, after an OOM the process vanished. I am pretty sure...
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