getting panic during kmalloc

Hi I have a requirement of creating 1M buffers of 24 bytes. So, my driver is calling kmalloc in loop but it is giving following panic after some iterations. System have 4 GB RAM and I was continuosly checking top, it had sufficient memory to allocate. --- [cut here ] - [please

Re: Kernel build problem

On Wed, Jul 02, 2008 at 11:18:09AM +0530, Shyamal Shukla wrote: I am trying to compile Linux kernel version 2.4.35. However, the computer hangs abruptly after some amount of code has been compiled. The same happens when i try hands on Linux 2.6.17. There is no fixed file at which the

RE: getting panic during kmalloc

Hi, Although kmalloc() gives you 24 bytes per call that you can use, but internally it allocates in pages, and hence 1 page (=4K bytes in each iteration) HTH, Rajat From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of gagan grover

Re: getting panic during kmalloc

Could you send us the code snippet where you are allocating these buffers? -- Mark On Jul 2, 2008, at 3:28 AM, gagan grover wrote: Hi I have a requirement of creating 1M buffers of 24 bytes. So, my driver is calling kmalloc in loop but it is giving following panic after some iterations.

Re: getting panic during kmalloc

Hi... On Wed, Jul 2, 2008 at 2:28 PM, gagan grover [EMAIL PROTECTED] wrote: Hi I have a requirement of creating 1M buffers of 24 bytes. So, my driver is calling kmalloc in loop but it is giving following panic after some iterations. System have 4 GB RAM and I was continuosly checking top, it

Re: getting panic during kmalloc

El Wed, Jul 02, 2008 at 06:38:52PM +0530 Rajat Jain ha dit: Although kmalloc() gives you 24 bytes per call that you can use, but internally it allocates in pages, and hence 1 page (=4K bytes in each iteration) though kmalloc() usually wastes some memory in allocations it doesn't

Re: Bad page state at free_hot_cold_page

Hello Johannes, The problem is not reproducible. I realise that the problem probably has been fixed in more recent kernels, but I'd still like to know what the fix was so that I can patch the kernel without upgrading. On Tue, Jul 1, 2008 at 9:19 AM, Johannes Weiner [EMAIL PROTECTED] wrote: Hi,

Re: Newbie: kernel search techniques ??

On Wed, Jul 02, 2008 at 09:21:15AM -0400, William Case wrote: Are there tutorials, programs or git techniques that assist me in doing those kind of traces? LXR was already mentioned. Also, have a look at 'make cscope' and your $EDITORs capabilities with cscope-output. (Warning: cscope files are

how can the kernel read from a processes pages ?

Hi, I want to do the following from a kernel module or kernel code : Read a byte from any page in physical memory. It doesn't matter if that page is being used by a process or not. From an earlier post someone recommended I use ioremap() to map the pages (build page tables) into the kernel and

Where is the unlikely subroutine defined?

I have been working in the scheduler where I see a subroutine called 'unlikely'. I would like to know where 'unlikely' is defined source tree. Specifically what file. example of usage: if (unlikely(reacquire_kernel_lock(current) 0)) goto need_resched_nonpreemptible; thanks for