General :: Time Oriented Program In Kernel Space?
Jan 28, 2010I have written a programme in gcc
#include <time.h>
#include <stdio.h>
int main(void)
[code]...
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General :: Measure Kernel Space Time And User Space Time?
Nov 28, 2010measure kernel space time and user space time?
View 1 Replies View RelatedGeneral :: Time Function In Kernel Space?
Jan 26, 2010I manage to use the function "time" and "localtime" in gcc.But while I used it in a module in kernel space the above 2 functions are giving error.Even in kernel space time.h header file is not identified. tell the similar time function which can be used in kernel space
View 1 Replies View RelatedGeneral :: Division Of Logical Memory Space In To User Space And Kernel Space
Jan 4, 2010Logical Memory Space of 4GB is divided in to 3GB User Space and 1GB Kernel Space. Always. Correct?
1. How can we change it? (just changing value of PAGE_OFFSET is okay?)
2. If system have only 256MB of memory (embedded system) and suppose Kernel Modules eat away all the memory during boot. User space will be left will no memory. Is this case possible?
General :: Calling User Space Callback Function From Kernel Space?
Sep 22, 2009I am writing device driver in which i have to call callback function from kernel space, which are saving my data. But the callback functions are in userspace. While accessing them i am getting segmentation fault.
View 1 Replies View RelatedGeneral :: Short A Time Can Time (system Program) Measure?
Apr 15, 2010I'm just wondering what the limits for time are. I have a program that always takes exactly 20 ms, so I assume this is the lowest it can measure, but I want to see if there's some sort of documentation of this.
View 3 Replies View RelatedGeneral :: Create Landscape Oriented Pdf With Ghostscript?
Dec 13, 2009im using cups filter 'texttops', to generate postscript file, then I;m using ghostscript to create pdf file. The problem is, that file generated from texttops don't contain landscape orientation instructions. How can I force ghostscript to do that. Here is the command Im using:
gs -sDEVICE=pdfwrite -sOutputFile=<outfile> -dBATCH -dNOPAUSE -f <infile>
I've found on the internet these instructions, but they don't work for me:
gs -dBATCH -dNOPAUSE -sOutputFile=myfile.pdf -sDEVICE=pdfwrite -dAutoRotatePages=/None -c "<< /PageSize [612 792] /Orientation 3 >> setpagedevice" 90 rotate 0 -612 translate -f myfile.eps
[code]....
General :: Run A Program For A Specific Amount Of Time Starting At A Specific Time?
May 18, 2010I want to record an internet radio station starting at 2:00am tomorrow morning. The specific program on the radio station lasts until 6:00am. The command I need to run to record the station is: Code:mplayer http://wjcu.jcu.edu:8001/listen.pls -ao pcm:file=indie_heat_of_the_night.wav -vc dummy -vo nullI'd use cron, but 1. I'm not sure how to and 2. it seems unnecessarily complicated for something that I only want to run once. If cron is the only/easiest solution, I guess I'll just have to resort to that, but I'd rather not.
View 12 Replies View RelatedGeneral :: Installing Program - Different Disk Space Requests
Feb 8, 2011I am trying to load vmware server. When running vmware-install.pl it asks where to load the bin files. Default is /usr/bin. Cool with me, so I accept then get the error:
"There is insufficient disk space available in /usr/bin. Please make at least an additional 5924k available or choose another directory."
Ok, so in my searches, most cases people actually do have a full disk. I have 30gb free. Another post somewhere stated it could be the file system used, so I tried different file systems. Now I am back on etx3. What's odd is when I blow away the OS and reload and try to install VMware again, I get a different number to be "freed" in the error. Choosing another directory only yeilds a different disk space request.
Programming :: Passing Data Between Kernel Space To User Space In Asynchronous Way
Dec 13, 2010I am developing a I2C CDROM client driver. The CDROM firmware supports TOC information read through a I2C command. It sends the TOC information in burst ( Interrupts a GPIO pin when it is ready ) and my CPU does a I2C read to read the TOC. When the CDROM firmware finishes sending the last data burst , it informs my CPU that it is done with the TOC, by a flag in the last data burst. I would like to know, which is the most efficinet way I can send these TOC information to userspace?
View 4 Replies View RelatedProgramming :: Function In Kernel Space Called Form User Space
Jul 7, 2009I wanna write a file in kernel space but from my searching I can to know that instead of writeing file in kernel space ,I can write data to user space by copy_to_user space.
But link is missing ...I dont know how will my user space will access kernel space means my function in kernel space which will do copy_to_user /....How my user space function will call my kernel level function ..
Can any one of you provide me with some example file which are doing this .I know every char driver is using it ...but i could not trace back how user level function is accessing it ...i m confused between user space and kernel space.
Programming :: Call Socket Prog Code Written In User Space From Kernel Space?
Jul 14, 2009How to use execv from kernel space to call a user space program writtenfor socket prog.
I tried to write code for socket in kernel but its not working.
Socket code in kernel is also needed.
General :: Different Space Usage (Discus Program Versus Command)
Mar 24, 2011I have a debian linux on my server. My disk space is only 10GB. When I check the space usage with discus program, it says:
Mount Total Used Avail Prcnt Graph
/ 9.39 GB 8.30 GB 1.10 GB 88.3% [*********-]
+ib/init/rw 124.3 MB 0 KB 124.3 MB 0.0% [----------]
/sys 0 KB 0 KB 0 KB 0.0% [----------]
/dev 120.1 MB 92 KB 120.0 MB 0.1% [----------]
/dev/shm 124.3 MB 0 KB 124.3 MB 0.0% [----------]
But when I use this command:
du / --max-depth=0
It says:
1860864 /
Why the stats of discuss is not like du command?
General :: Takes Long Time While Booting - Enabling Swap Space ?
May 9, 2010While booting Linux it takes ages for 'enabling swap space'
I have allocated swap space twice that of the RAM.
Is there a way to fix it? What should I do to avoid this in the future installs?
Programming :: Signal From Kernel Space To User Space?
Jul 21, 2011I have the following requirement in my module. The driver gets some data from the external device. After getting 1MB of data it has to send it to the user space application. What is the best thing to implement for this in driver.? Is it ok to implement like, after getting data, the driver will send a signal to the user space application. Then the user space application sends an ioctl to read the data. Is there any alternate, that the driver directly sends the data without the user space application asks for it.?
View 4 Replies View RelatedGeneral :: Install 12, Every Time Chose The Space To Install It, It Says That There Is No Enough Space To Install It?
May 11, 2010I have 40gb of hd and I want Xp and fedora on it. I installed Xp first and now I want to install Fedora 12, every time I chose the space to iinstalll it, it says that there is no enough space to install it, although the xp just took less than 2gb of the disk. How can I resize it so that there is enough space?
View 8 Replies View RelatedGeneral :: I2C Communication From Kernel Space?
May 11, 2011How do you interface with the Linux I2C driver from kernel space? For example, if I had LEDs connected to a GPIO expander on the I2C bus, how would I blink them twice before going down for reset from machine_reset()?
Essentially, I believe I need to call the functions i2c_smbus_write_byte(), i2c_smbus_read_byte(), etc. But these functions require I2C client data that I do not understand how to supply.
General :: Getting Out Of Space While Building Kernel
Jul 10, 2011I am trying to build linux kernel I am getting out of space after a while. I unpacked it in /usr/src directory. It seems I have plenty of space. How much space does it need to compile & build kernel. I am using VirtualBox.
root@vinay-VirtualBox:/usr/src/linux-2.6.39.3# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 6.9G 3.2G 3.4G 49% /
none 669M 640K 668M 1% /dev
none 675M 24K 675M 1% /dev/shm
none 675M 96K 675M 1% /var/run
none 675M 0 675M 0% /var/lock
/dev/sr0 39M 39M 0 100% /media/VBOXADDITIONS_4.0.10_72479
General :: Execution Time In A C Program ?
Jan 10, 2010I need to find out the processing or operating time in milliseconds or in nanoseconds for the instructions or for the whole process!
for eg :
I need to calculate the time taken to execute :
And i dont want the time for whole program :
General :: Kernel Module Run In It / User Space?
Oct 25, 2010I'm pretty new to this whole (micro)kernel architecture story.
Im wondering if a kernel module is running in kernel or in user space?
Is a driver running as kernel module slower than a driver build into kernel?
If so, are there some current articles, benchmarks?
General :: Difference Between User And Kernel Space?
Jul 12, 2010what difference between user and kernel space.
View 2 Replies View RelatedGeneral :: Shared Buffer Between User And Kernel Space
May 3, 2010I need a shared buffer between user and kernel space. I read that one way is to allocated buffer in kernel and then call mmap from the user space. I searched for an example but couldn't find something useful. If you know, could you please send me any links or sample code that does this..
View 1 Replies View RelatedGeneral :: Starting Up A Script Or A Program At Boot Time?
May 8, 2010i wanted to know how can I make my programs or script automatically start at boot time ,for example if I restart my server at any time they start at boot time automatically with no need to any body to start them.
View 2 Replies View RelatedGeneral :: Get Ubuntu To Automatically Run A Program Every Time The Screen Is Unlocked?
Oct 31, 2010I have a script I would like to have automatically invoked every time the screen is unlocked. Does Ubuntu provide some support for users who wish to do this?
View 1 Replies View RelatedGeneral :: Make Second Program Running With CPU Time Limit 2 Seconds?
May 16, 2011Linux bash inline command to execute a program and limit the resource.As I know, to limit the resource I can use ulimit command.But, the problem is when I set the CPU time limit 1 second, and then I want to execute another program with CPU limit 2s, the ulimit command return an error like this: bash: ulimit: CPU time: cannot modify limit: Operation not permitted and absolutely my program killed in 1 second.So, How can I make the second program running with the CPU time limit 2 seconds?
View 3 Replies View RelatedGeneral :: Measuring Time That A Program Is Running In Shell Script
Nov 11, 2010I have a script that executed 100000 C Programs, reads the commands from a file and executes them. There is a requirement to measuer the time that each of this 100K C programs running.If it exceeds 120 sec I want to Kill that Process.Any Idea to embed this in my shell script?
View 4 Replies View RelatedGeneral :: How To Program The Command Line To Run A Piece Of Code Multiple Time
Dec 4, 2010So, I usually write/find a test case generator for any code that I write. This type of code generally leads to some file output. To be thorough, I try and generate many different files to test my code on.
Say the command is like this:
Is there a way to automate this for many different values of the parameters and generate many different files?
I tried:
I wasn't able to use the $i in the filename, and without it the command gave me no errors, but did nothing else either. I know the Unix command line is very powerful, and I have a feeling that this should be possible, but I just don't know how to do it.
General :: Mapping Kernel Virtual Address Space To Physical Memory Zones?
Nov 4, 2010As i undertsand - out of 1GB of the virtual Address space for Kernel from 3GB to 4GB of the process address space, Kernel image (code, data, bss, stack, heap) resides staring @0x0 address. Vmalloc area starts either at the end of Physical ram size or at 896M. This 896M cap is mandated to ensure that minimum of 128MB is reserved as vmalloc_reserve for vmalloc,kmap etc.
Is the understanding correct? Now trying to map Physical Zones into this 1GB address space
Initial 16MB is mapped to ZONE_DMA
16MB - 896MB is mapped to ZONE_NORMAL
896MB - 1024MB is mapped to ZONE_HIGHMEM
Does this mean that Kernel image is residing in ZONE_DMA area? Any call to vmalloc() in kernel code will return address beyond 896M? insmod of any LKM will internally invoke vmalloc() to obtain contiguous area - where will this code physically located along with rest of kernel code in ZONE_DMA or in ZONE_HIGHMEM?
General :: Kernel Configuration For C / C++ Program
Apr 15, 2011I am writing a C program (recovery utility) that needs to run at boot. I have found my way into this (booting a kernel) and now I want to configure the kernel so that it doesn't take a lot of space and compile fast so that I can edit the source afterwards and make it run my program on the kernel's startup.for the least size. The only thing this program needs is reading and writing files in all of the local hard disks (and some standard libraries such as stdio.h and stdlib.h) so I can keep the kernel simple by removing a lot of stuff such as networking, encryption algorithms and others. What would be the best configuration for this, so that it is really small in size? Should I simply start a new configuration and then only select things that I need, or should I take the "default" configuration and start removing things? What options are a MUST to make the kernel run?
View 1 Replies View RelatedGeneral :: How To Recompile My Module On Boot Time With Kernel
Jan 25, 2010I am using FC9, I want to write a module that will always show current time after booting.But for that I need not only to load module using insmod/modprobe, but also to compile that module during boot time.How can I perform this 2 steps correctly.
View 11 Replies View Related