vmalloc errors in 2.4.20

vmalloc errors in 2.4.20

[sandeep uttamchandani]

The linux kernel 2.4.20 seems to have problems with
vmalloc. Here is what I did:

In my driver, I try to allocate a buffer of size 512K
using vmalloc ( kmalloc cannot allocate more than
128K). It generates a kernel oops message saying that
the virtual memory cannot be allocated.

I suspect there is a problem with the address range
defined for vmalloc namely by VMALLOC_START and
VMALLOC_END. 

Any thoughts of what might be going-on ? 

Please do let me know if you want to look at the
kernel oops message. 

Thanks,
Sandeep
sandeepu@us.ibm.com

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Re: vmalloc errors in 2.4.20

[Martin J. Bligh]

> The linux kernel 2.4.20 seems to have problems with
> vmalloc. Here is what I did:
> 
> In my driver, I try to allocate a buffer of size 512K
> using vmalloc ( kmalloc cannot allocate more than
> 128K). It generates a kernel oops message saying that
> the virtual memory cannot be allocated.
> 
> I suspect there is a problem with the address range
> defined for vmalloc namely by VMALLOC_START and
> VMALLOC_END. 
> 
> Any thoughts of what might be going-on ? 

Not really. But why don't you just call alloc_pages instead?

M.

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Re: vmalloc errors in 2.4.20

[Karen Shaeffer]

On Sat, Feb 08, 2003 at 08:39:37PM -0800, sandeep uttamchandani wrote:
> The linux kernel 2.4.20 seems to have problems with
> vmalloc. Here is what I did:
> 
> In my driver, I try to allocate a buffer of size 512K
> using vmalloc ( kmalloc cannot allocate more than
> 128K). It generates a kernel oops message saying that
> the virtual memory cannot be allocated.
> 
> Thanks,
> Sandeep
---end quoted text---

Hi Sandeep,

I'm running a stock 2.4.20 kernel and put together a little test module that
allocates 512k memory with vmalloc. I have no problems on an Intel X86. I
also ran it allocating 1MByte as well.

cheers,
Karen
-- 
 Karen Shaeffer
 Neuralscape, Palo Alto, Ca. 94306
 shaeffer@neuralscape.com  http://www.neuralscape.com
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