Hello,
> Could anyone please let me know how can I achieve this?
Is hard lockup detector enabled in your system? Could you
post your .config.
thanks,
Daniel.
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Hello,
Why the stack isn't always dumped in watchdog_timer_fn ([1])?
Registers content is useful, but without a stack trace it's very
hard to find the task which caused system softlockup.
thanks,
Daniel.
[1] http://lxr.linux.no/linux+v2.6.39/kernel/watchdog.c#L292
Hello,
> * The design of unix operating system (Bach)
>
> * Modern operative systems (Tanenbaum)
>
> * Operating Systems design and implementation(Tanenbaum)
>
> I haven't done formal Computer Science studies, and I don't the time to read
> the three of them, but as I am working very close to the
On Fri, May 27, 2011 at 1:49 PM, sandeep kumar
wrote:
> Hi all,
> Memory mapping is done so that CPU can access the devices, which it cant
> unless.
>
> Now the question is can we memory map a one device resource(say some
> iomemory) to two different memory locations?
> the other way of seeing at
On Fri, May 27, 2011 at 2:44 PM, Naman shekhar Mishra
wrote:
> In Operating System Concepts 6th ed, chapter 20:
> "Kernel code can thus assume that it will never be preempted by another
> process and that no special care must be
> taken to protect critical sections. The only requirement is that cr
Try this:
http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.35.tar.gz
thanks,
Daniel.
On Mon, May 23, 2011 at 2:08 PM, sandeep kumar
wrote:
> Hi all,
> I want to download kernel version 2.6.35 for a specific reason.
> I have a patch which is to be applied to that specific kernel revision.
>
On Sat, May 21, 2011 at 2:33 AM, Abu Rasheda wrote:
> Can someone pass me pointer to Linux kernel test suite ? I am
> specially interested in iptables (netfilter) and socket APIs.
Hello Abu,
Linux Test Project can be a good starting point ([1]).
thanks,
Daniel.
[1] http://ltp.sourceforge.net/
2011/5/19 Ezequiel García
>
> Thanks Dave for your answer. I guess the same question has been answered
> several times before. For the interest reader, I've found these:
>
> http://unix.stackexchange.com/questions/4711/what-is-the-difference-between-ioctl-unlocked-ioctl-and-compat-ioctl
>
> http:
On Thu, May 12, 2011 at 7:34 AM, Amit Nagal wrote:
> Hi ,
>
> What are the mandatory tools that must be run to identify potential
> bugs ( say memory , locking etc )
> in a linux device driver ?
Turning on DEBUG_SLAB might be a good option.
Have a look for all available options under make menucon
OK. See how write and read works.
> $strace echo -n "abcd" > /dev/memory(/home/aravind/me
> write(1, "abcd", 4) = 1
> write(1, "bcd", 3) = 1
> write(1, "cd", 2) = 1
> write(1, "d", 1) = 1
>$ strace cat /dev/memo
> i create a character special file using mknod in /dev directory.
>
> i try to write data to my file by" echo -n "abcd" > /dev/memory "
>
> and when i try to read from that file i get the last char was written
> to that file that is "d"
Hello Aravind,
Can you post the output for:
$ strace -n "a
> so rather than the canonical combination of cdev_init() and
> cdev_add(), this appears to register the pre-defined DSP56K major
> number, then goes straight to registering the driver with sysfs.
>
Check register_chrdev code. [1]
As you can see register_chrdev does cdev_alloc + cdev_add.
> is
Hi Robert,
> static int __init bsr_init(void)
> {
> struct device_node *np;
> dev_t bsr_dev = MKDEV(bsr_major, 0); <---
You are right, this seems to be completely useless.
Go on make a patch, compile and send it.
thanks,
Daniel.
> For better understanding you can do
>> gdb vmlinux
> and then run
> gdb> disassemble _read_unlock_bh
>
> Then look at offset 0x10.
Did that. Is there any way to show disassembled
output interleaved with source code?
thank you all for your answers.
Daniel.
Hello,
I have the following stack trace:
[3992.172/0] BUG: soft lockup - CPU#0 stuck for 61s! [events/0:39]
[ 3992.215/0] Pid: 39, comm: events/0 Tainted: PW 2.6.32 #1 X8DTT-H
[ 3992.222/0] RIP: 0010:[] []
__write_lock_failed+0x9/0x20
[ 3992.231/0] RSP: 0018:880028203908 EFLAGS: 00
On Mon, Apr 4, 2011 at 4:13 PM, Laurențiu Dascălu
wrote:
> Hello,
>
> I'm trying to implement a simple scheduling policy in the Linux kernel,
> but I'm not sure if I correctly understand the sched_class interface.
> Specifically, I would like to know more about the following functions:
There's so
> A daemon sleeps in the background. User can enter a string through the proc
> interface. Whenever a string is entered, the daemon is woke. The daemon
> keeps a copy of the last entered string in a variable. Initially the
> variable is initialized to NULL. When the daemon wakes, it checks if the
>
On Sun, Apr 3, 2011 at 10:17 PM, mohit verma wrote:
> Hi list,
> I have a very basic question.
How much time have you tried documenting on this topic [1]?
thanks,
Daniel.
[1] http://answers.google.com/answers/threadview/id/718661.html
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> Is there a way to find, in the kernel src tree, which routine/function is
> calling another function OR kernel function invocation stack order?
> This would be helpful for me to know the various steps/functionalities
> involved during executing something in kernel space.
At runtime you can use d
> Is there a way to find, in the kernel src tree, which routine/function is
> calling another function OR kernel function invocation stack order?
> This would be helpful for me to know the various steps/functionalities
> involved during executing something in kernel space.
At runtime you can use d
On Thu, Mar 31, 2011 at 10:29 PM, Vimal wrote:
> Hi,
>
> Is it possible for an application (say "snoop", with sufficient
> privileges) to monitor data on any socket/file descriptor in the
> system?
>
> Here's an example: suppose we have a browser and it creates a tcp
> socket to connect to a URL.
On Thu, Mar 17, 2011 at 10:59 PM, Arvid Brodin wrote:
> Hi,
>
> Daniel Baluta wrote:
>> Hello,
>>
>>> The call to kmem_cache_zalloc() never returns; the printk() text on the line
>>> after is never displayed and the system locks up. The printk() om the lin
Hello,
> The call to kmem_cache_zalloc() never returns; the printk() text on the line
> after is never displayed and the system locks up. The printk() om the line
> before displays.
What flags are you passing to kmem_cache_zalloc?
thanks,
Daniel.
___
Hello,
> Unfortunately, I don't have particular project ideas. But I'm interested
> in memory management and device drivers.
What about making kmemleak [1] available on not yet supported architectures?
thanks,
Daniel.
[1] http://lxr.linux.no/linux+v2.6.37.3/Documentation/kmemleak.txt
_
Hello,
> I want to know with respect to an image here
> http://bderzhavets.files.wordpress.com/2010/04/pv-2-6-32-12.png
> I have already compiled a kernel
> it mentions to enable "user space grant access driver"
> While compiling I did not notice it how can I now verify post compile
> some symbol
> i am putting a printk() on link_path_walk() kernel function ( the pathname
> resolution function). i access that printk() only at some special condition
> (like if pathname passed to link_path_walk() matches with some name) . but
> when it gets hit like when i pass pathname via unlink(2) , lots
On Sat, Feb 26, 2011 at 12:03 AM, Mauro Romano Trajber
wrote:
> Same behavior for a new syscall created from scratch.
Instruction caching?
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On Fri, Feb 25, 2011 at 8:22 PM, Mauro Romano Trajber wrote:
> Thanks Enrico and Daniel, you're right. glibc was caching getpid(); but this
> is not the root cause of this behavior.
> Going further, I decide to use call getpid without glibc, using
> syscall(SYS_getpid) to test this behavior and i
Hi Mauro,
On Fri, Feb 25, 2011 at 7:03 PM, Mauro Romano Trajber wrote:
> I was doing some performance tests of system calls and I find an interesting
> behavior.
> Using RDTSC to count the CPU cycles, a single call to the getpid() consumes
> about 7k of CPU clock cycles and ten calls consume appr
On Tue, Feb 8, 2011 at 5:50 PM, Sankar P wrote:
> On Tue, Feb 8, 2011 at 5:36 PM, Daniel Baluta
> wrote:
>>
>> > If I try to create a file using, 'mknod /dev/scull2 c 250 7' , the
>> > character device file gets created with a minor number of 7.
>&g
> If I try to create a file using, 'mknod /dev/scull2 c 250 7' , the
> character device file gets created with a minor number of 7.
You can create as much /dev/scull2 files using mknod as you
want, but they are not linked with your driver.
[first_minor, count] pair passed to alloc_chrdev_region r
Hi all,
We know that each file descriptor fd, has an associated 'struct file'. How is
the 'struct file' copied/cloned at fork?
Are all fields of 'struct file' inherited by child? I want to know if
there is a function
which takes a struct file* and creates a consistent copy/clone of it.
thanks,
D
Hi Spiro,
> While it essentially works as I want it to, I found that I am leaking
> memory this way. Having this module in a highly loaded network,
> "head -n5 /proc/meminfo" shows that MemFree is steadily falling, until
> the kernel OOPS with an out of memory condition.
Have you considered using
On Thu, Jan 20, 2011 at 5:56 PM, Greg KH wrote:
> On Thu, Jan 20, 2011 at 12:41:57PM +0200, Daniel Baluta wrote:
>> Hello all,
>>
>> Can I make any use of kmemcheck if I don't have sysfs
>> kernel support enabled?
>
> Why would you ever want to run a kernel
On Thu, Jan 20, 2011 at 12:52 PM, Catalin Marinas
wrote:
> On Thu, 2011-01-20 at 10:41 +0000, Daniel Baluta wrote:
>> Can I make any use of kmemcheck if I don't have sysfs
>> kernel support enabled?
>
> Kmemleak can scan output the memory and report the number of leaked
> Can I make any use of kmemcheck if I don't have sysfs
> kernel support enabled?
s/kmemcheck/kmemleak :D
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Hello all,
Can I make any use of kmemcheck if I don't have sysfs
kernel support enabled?
thanks,
Daniel.
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Hello,
When casting sock to inet_timewait_sock ([1]) it is assumed
that sock points to a structure of type inet_timewait_sock.
Is there a way to check if a sock struct wraps around
a inet_timewait_sock struct?
thanks,
Daniel.
[1] http://lxr.linux.no/linux+v2.6.37/include/net/inet_timewait_sock.
Hello,
When casting sock to inet_timewait_sock ([1]) it is assumed
that sock points to a structure of type inet_timewait_sock.
Is there a way to check if a sock struct wraps around
a inet_timewait_sock struct?
thanks,
Daniel.
[1] http://lxr.linux.no/linux+v2.6.37/include/net/inet_timewait_sock.
Hi,
On Thu, Jan 13, 2011 at 6:42 PM, cheng chen wrote:
> Hi all,
> I am working on vehicle body control system with can-bus as my BE final
> project.
> It contains three parts.
> 1.CAN chip driver
> 2.CAN-bus protocol stack
> 3.UI
> The problem is that I already have written the CAN chip driver a
> I thought about using 3 files in sysfs.
> 1. address of the register
> 2. data to write to the register
> 3. trigger that do the write
The most effective solution would be to
have one file per register.
Writing register:
# echo value > /sys/path/to/file
Reading register:
# cat /sys/path/to/fil
On Mon, Jan 3, 2011 at 2:47 PM, Kfir Lavi wrote:
> Hi,
> I have a FPGA that is constantly changing (its on development phase).
> I want to let userspace app to update those registers, but don't want to
> create an API yet.
> What is the best way to open a range of registers to userspace, so no dri
What will happen with the list archives?
Daniel.
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