04-06-2011
HELP!!: CPU resource allocation between kernel modules and user mode process
Hi,all:
I run my program which consists of one kernel module and one user mode process on a dual core server. The problem here is the kernel module consumes 100% of one core while the user mode process only consumes 10% of the other core, is there any solution that I can assign some computing power from the user-mode core to the kernel-mode core, is there any allocation scheme? I knew linux seems to have some system call to allocate CPU between different processes, but not with kernel module.
Thanks very much to reply.
10 More Discussions You Might Find Interesting
1. HP-UX
Hi all,
what do kernel modules libaudit, klog and strlog do?
Specifically I want to determine if it was possible for us to determine if kernel level auditing is enabled at all?
regards (0 Replies)
Discussion started by: slash_blog
0 Replies
2. Programming
Hi all,
I am trying to setup a program to use a device driver and am confusing buffer access between User and Kernel mode. I think all applications running in User space have to communicate with the device drivers using io control calls and then have some functions called back from the driver... (1 Reply)
Discussion started by: Brendan Kennedy
1 Replies
3. UNIX for Advanced & Expert Users
Can kernel process access user address space ? (2 Replies)
Discussion started by: subhotech
2 Replies
4. Red Hat
First post, sorry to be a bother but this one has been dogging me. I have a process user (java application server) that trips a resource limit every couple weeks and need help finding what limit we're hitting.
First, this is what's running:
This is the error when jobs are run or the... (0 Replies)
Discussion started by: Katahdin
0 Replies
5. Programming
when transitionaning from user to kernel mode which function copies data from user mode buffer to kernel mode? (5 Replies)
Discussion started by: rupeshkp728
5 Replies
6. HP-UX
Hello to all,
This may seem a stupid question, but I still can't find a satisfying answer.
I need to know how to estimate the amount of system memory allocated by the HP-UX kernel(11iv2 & 11iv3) at system startup assuming that I have all my kernel tunables at the default value and no... (0 Replies)
Discussion started by: Dario_C
0 Replies
7. UNIX for Dummies Questions & Answers
Hi,
I am new to the linux kernel development area. I want to know what is the difference between kernel mode stack and user mode stack? Does each process has a user mode stack and a kernel mode stack?? Or Each process has a user mode stack and there is only one kernel mode stack that is shared by... (4 Replies)
Discussion started by: saurabhkoar
4 Replies
8. UNIX for Advanced & Expert Users
When accessing a user mode buffers from kernel space drivers what precautions must we take and how those precautions need to be implemented? (0 Replies)
Discussion started by: rupeshkp728
0 Replies
9. UNIX for Dummies Questions & Answers
I have a multithreaded usermode program(actually a daemon) which is in hanged state.
To debug it I tried attaching the process to gdb, but the gdb hangs.
gstack also gets hanged.
I peeped into the proc file system and saw the process to be in sleeping state.
/proc/sysrq-trigger I guess... (1 Reply)
Discussion started by: rupeshkp728
1 Replies
10. Hardware
Hey everyone. I have a question, doing an lsmod gives me a list of all the loaded modules for my system. But how did they know to load? my /etc/modules files is empty, so how did these modules know to load themselves on boot time? If I were to take this hard drive to another computer with a... (6 Replies)
Discussion started by: Lost in Cyberia
6 Replies
LEARN ABOUT FREEBSD
crashinfo
CRASHINFO(8) BSD System Manager's Manual CRASHINFO(8)
NAME
crashinfo -- analyze a core dump of the operating system
SYNOPSIS
crashinfo [-d crashdir] [-n dumpnr] [-k kernel] [core]
DESCRIPTION
The crashinfo utility analyzes a core dump saved by savecore(8). It generates a text file containing the analysis in the same directory as
the core dump. For a given core dump file named vmcore.XX the generated text file will be named core.txt.XX.
By default, crashinfo analyzes the most recent core dump in the core dump directory. A specific core dump may be specified via either the
core or dumpnr arguments. Once crashinfo has located a core dump, it analyzes the core dump to determine the exact version of the kernel
that generated the core. It then looks for a matching kernel file under each of the subdirectories in /boot. The location of the kernel
file can also be explicitly provided via the kernel argument.
Once crashinfo has located a core dump and kernel, it uses several utilities to analyze the core including dmesg(8), fstat(1), iostat(8),
ipcs(1), kgdb(1), netstat(1), nfsstat(1), ps(1), pstat(8), and vmstat(8).
The options are as follows:
-d crashdir
Specify an alternate core dump directory. The default crash dump directory is /var/crash.
-n dumpnr
Use the core dump saved in vmcore.dumpnr instead of the latest core in the core dump directory.
-k kernel
Specify an explicit kernel file.
SEE ALSO
textdump(4), savecore(8)
HISTORY
The crashinfo utility appeared in FreeBSD 6.4.
BSD
June 28, 2008 BSD