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Forum: Kernel

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

  1. 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: 1,140
    09-01-2016 Go to last post
  2. 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: 2,078
    08-29-2016 Go to last post
  3. 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: 3,029
    08-28-2016 Go to last post
  4. 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: 1,582
    08-25-2016 Go to last post
  5. 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: 3,555
    08-19-2016 Go to last post
  6. 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: 1,843
    08-19-2016 Go to last post
  7. 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: 1,067
    08-18-2016 Go to last post
  8. 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: 2,037
    08-14-2016 Go to last post
  9. 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: 1,712
    07-28-2016 Go to last post
  10. 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: 1,432
    07-26-2016 Go to last post
  11. 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: 1,291
    07-18-2016 Go to last post
  12. 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: 1,350
    07-17-2016 Go to last post
  13. 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: 3,226
    06-27-2016 Go to last post
  14. Linux kernel time mangement

    delete please

    Started by mappa, 06-23-2016
    • Replies: 0
    • Views: 956
    06-23-2016 Go to last post
  15. 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: 1,579
    06-21-2016 Go to last post
  16. 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: 1,115
    06-13-2016 Go to last post
  17. Virtual/Soft PCI Device

    Hello, I'm developing hardware and have a software simulation for the hardware. To test this software simulation "in situ", I'm wondering if...

    Started by cubeleo, 02-05-2014
    • Replies: 4
    • Views: 2,892
    06-10-2016 Go to last post
  18. The GNU vision and the Linux kernel

    Hello, I've been reading up on the history of GNU, the Hurd kernel and the Linux kernel. I find it all pretty fascinating. What I'm wondering...

    Started by sunnybubblegum, 06-03-2016
    • Replies: 3
    • Views: 1,745
    06-04-2016 Go to last post
  19. Question API Design for "find_prev_bit"

    Background The Linux Kernel API has a find_next_bit API that finds the first set bit in a memory region at or after a given offset: /** *...

    Started by hansonchar, 05-20-2016
    • Replies: 0
    • Views: 1,462
    05-20-2016 Go to last post
  20. Issue with Block Group Descriptor Table replicas in ext3 file system

    Hi, As you know, the block group descriptor table is replicated in various block groups starting from first block group. But the file system...

    Started by anoopss, 03-30-2016
    • Replies: 2
    • Views: 1,653
    05-18-2016 Go to last post

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