EmbLogic » ayush.gupta

Excessive kworker entries in process status table when system is idle.

ayush.gupta — Sun, 21 Apr 2013 22:13:43 +0000

When I list the processes executing on my system it displays many kworker/ processes with interruptible sleep (waiting for an event to complete) , an unknown value of tty and many different pids (even if my system is idle).
Also when I execute “top” it does not display any entry of kworker.
I am using fedora 16_64bit and 3.4.9-1.fc16.x86_64 kernel.
Can anyone please explain what kworker is/does? Why are there so many entries for kworker processes in the process status table?

Embedded Linux on ARM Cortex A8.

ayush.gupta — Tue, 16 Apr 2013 18:53:31 +0000

Embedded Linux is the use of Linux in embedded computer systems. Linux has been ported to a variety of CPUs which are not only primarily used as the processor of a desktop or server computer, but also ARM, AVR32, ETRAX CRIS, FR-V, H8300, IP7000, m68k, MIPS, mn10300, SuperH, and Xtensa processors, It is also used as an alternative to using a proprietary operating system and toolchain. Linux is an open source operating system. It enjoys support by a large group of engineers contributing back into the open source (similar process to the FSF’s GNU tools).This makes Linux a very dynamic and fast moving operating system.

E-14 Update Assignment Status.

ayush.gupta — Wed, 05 Sep 2012 16:54:36 +0000

Dear E-14 Trainees,
Please update the status of Assignment 01 on the blog post created by Siddarth sir (link: http://emblogic.org/blog/08/e14-assignment-01/). Tomorrow we will be discussing the doubts related to Assignment 01. Please come prepared with your doubts and problems.

E-14 Pointers

ayush.gupta — Fri, 31 Aug 2012 12:30:43 +0000

declared char *ptr;
printed the address allocated to ptr (&ptr), garbage address of ptr (ptr ) and the garbage value (*ptr)
Error: Segmentation Fault.
Can you please explain why?

E-14 pre-increment and logical operators

ayush.gupta — Thu, 30 Aug 2012 21:21:49 +0000

Initializing x,y,z=1 and after applying operation ++x||++y&&++z; The values when printed gives: x=2; y=1; and z=1;
It increments the value of x but does not increment the values of y and z. can anyone please explain why?

Print Star Pattern using for loop.

ayush.gupta — Sat, 18 Aug 2012 19:21:08 +0000

#include
int main ()
{
printf(“Program to print a pattern of stars.\n”);
int i1,i2,i3,val;
printf(“Enter a number:\n”);
scanf(“%d”,&val);
for(i1=0;i1 {
for(i3=val*2;i3>i1;i3=i3-2)
{
printf(” “);
}
for(i2=0;i2<=i1;i2++)
{
printf(“*”);

}
printf(“\n”);
}
return 0;
}

E14 Star Pattern Using for Loop.

ayush.gupta — Fri, 17 Aug 2012 18:58:56 +0000

#include
int main ()
{
printf(“Program to print a pattern of stars.\n”);
int i1,i2,i3,val;
printf(“Enter a number:\n”);
scanf(“%d”,&val);
for(i1=0;i1 {
/*for(i3=val;i3>i1;i3–)
{
printf(” “);
}*/
for(i2=0;i2<=i1;i2++)
{
printf(“*”);

}
printf(“\n”);
}
return 0;
}

I tried to print a pattern of stars using for loop. The problem i am facing with the logic is that i want to print the following pattern:

***

*****

******* /*i.e is odd number of stars to be printed in n number of lines ; Where n is specified by the user;*/ I wanted to print this pattern using for loop only.
anyone wid solution?