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Forum: Kernel

Request help with Linux kernel compilation, theory, programming, or other kernel related issues

  1. Lightbulb A long time issue, Kthreadd stuck processes.

    these kthreadds came from a virtual box instance. What i read is it is stuck on the HDD or some hardware somewhere waiting for a signal to get...

    Started by zzRemix, 09-29-2016
    • Replies: 9
    • Views: 1,171
    09-29-2016 Go to last post
  2. Question Enlarging Linux Kernel Log Buffer more than 4MiB

    I want to have a large log buffer for my logging needs on an Android device (Nexus 5). I've already increased the log buffer size to 4MiB by changing...

    Started by m-d, 09-23-2016
    • Replies: 3
    • Views: 886
    09-25-2016 Go to last post
  3. What page replacement algorithms are being used?

    Hi, I read some articles about the memory management in Linux. Some of them say that the page replacement algorithm is LRU. Some say that it...

    Started by syko, 09-05-2016
    • Replies: 2
    • Views: 1,597
    09-06-2016 Go to last post
  4. Problem tracing arguments of compat_sys_execve with ftrace/Perf

    While trying to trace arguments of the 'compat_sys_execve' system call using ftrace or Perf, I noticed that not all arguments are always captured....

    Started by dhendriks, 09-01-2016
    • Replies: 1
    • Views: 764
    09-02-2016 Go to last post
  5. MemFree depleted in /proc/meminfo when writing to flash memory

    Hi, I have a problem where I am writing a 14 MB file into the flash memory. This will be a partition on the ext4 filesystem. However, when I do...

    Started by srivatsa231181, 09-01-2016
    • Replies: 1
    • Views: 567
    09-01-2016 Go to last post
  6. Different output tracing 'wait4' system call for strace vs ftrace/perf

    While trying to trace 'wait4' system calls for a program using ftrace/perf, I noticed that the 'wstatus' pointer doesn't seem to contain useful data....

    Started by dhendriks, 08-29-2016
    • Replies: 0
    • Views: 875
    08-29-2016 Go to last post
  7. Question latency with memory mapped files

    Hello All, we are have huge latency with accessing to memory mapped file. we are using multicore xeon, ram size is several times more than...

    Started by maxfox2k, 08-27-2016
    • Replies: 2
    • Views: 999
    08-28-2016 Go to last post
  8. How to add Qt lib to my rootfs?

    Dear fellow coders, i'm pretty new to Linux & Qt and right now I need to add Qt lib to my rootfs. I've a SDK with toolchains and is there a...

    Started by quaver23, 08-25-2016
    • Replies: 2
    • Views: 800
    08-25-2016 Go to last post
  9. Does kworker have the higher priorities than the user process?

    Hi, When an application writes data to file system, it is written to VM and the actual writes to disk are deferred. When the dirty portion of...

    Started by syko, 08-19-2016
    • Replies: 1
    • Views: 1,001
    08-19-2016 Go to last post
  10. issue with kernel >4.7

    Hi, when using 4.6 kernels this never happened, but after going to 4.7 onwards and even 4.8rc1 i have masses of kworker threads which seem to be...

    Started by boygeorge, 08-13-2016
    • Replies: 4
    • Views: 984
    08-19-2016 Go to last post
  11. Question [SOLVED] Does 'flush' threads in VM follow the priorities in I/O schedule?

    Hi, When an application writes data to file system, it is written to VM and the actual writes to disk are deferred. When the dirty portion of...

    Started by syko, 08-18-2016
    • Replies: 0
    • Views: 599
    08-18-2016 Go to last post
  12. read/write to memory

    Hello, I'm new in kernel land. I'm focusing on the security level. I already understood the risk with a null pointer dereference and buffer...

    Started by jcqguill, 08-05-2016
    • Replies: 3
    • Views: 1,059
    08-14-2016 Go to last post
  13. Build Error while kernel port ( 3.14 to 3.10)

    I am having 3.14 working kernel for my imx6,i want to port 3.10 to imx6 , during the build process i am getting the following error, and am i stuck,...

    Started by michealscott, 07-28-2016
    • Replies: 0
    • Views: 933
    07-28-2016 Go to last post
  14. IOCTL locking kernel on Xeon E3-1270 v5

    Has anyone experienced an issue with a system lock up when using IOWR with IOCTL on an Intel Xeon E3-1270 CPU? I have 3 different distributions...

    Started by SignoEleven, 07-26-2016
    • Replies: 1
    • Views: 650
    07-26-2016 Go to last post
  15. File Descriptor information question

    Hi, I was wondering, say I want to implement a system call. This system call takes as input parameter the file descriptor. How would I get the...

    Started by quantumlight, 07-18-2016
    • Replies: 0
    • Views: 780
    07-18-2016 Go to last post
  16. Linux process exit() cleanup question

    I was wondering, if I have a program like this: #include <stdio.h> void main() { printf("Hello World"); }

    Started by quantumlight, 07-17-2016
    • Replies: 4
    • Views: 638
    07-17-2016 Go to last post
  17. mm_struct RSS Counters

    I am trying to copy page table entries to a fresh virtual memory addresses. But I get bad RSS Counter warning for data larger than few mega bytes....

    Started by shankur90, 06-23-2016
    • Replies: 3
    • Views: 1,179
    06-27-2016 Go to last post
  18. Linux kernel time mangement

    delete please

    Started by mappa, 06-23-2016
    • Replies: 0
    • Views: 417
    06-23-2016 Go to last post
  19. Insertion order affects USB devices

    I am using Linux 3.0.1 on an arm9board OK6410-BH. I have a USB encrypted memory stick and associated token. If I insert the encrypted memory stick...

    Started by DavidAL, 06-21-2016
    • Replies: 3
    • Views: 691
    06-21-2016 Go to last post
  20. Linux kernel character drivers (kernel module)

    Hi dear community, I am trying to dive into kernel drivers in order to understand how does low level stuff works. I will describe how I...

    Started by Nitup, 06-13-2016
    • Replies: 0
    • Views: 486
    06-13-2016 Go to last post

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