On 13-Dec-2014 2:27 AM, "PRAJAPATI MEHUL" <mehulprajapati2802@xxxxxxxxx> wrote:
>
> Hi,
>
> -I am currently working on one embedded development board.
> -I have ported 3.0.31 kernel with my personal patches on it.
>
> -When I am trying to insert my module, it fails to allocate 4MB memory using kmalloc.
>
> -Below is a snapshot of cat /proc/meminfo command of my embedded linux system.
>
>
>
> -According to my understanding, LowFree parameter indicates free memory in kernel space which is around 536MB in this case.
>
> -There is a lot free space available in kernel space then
> why module fails in kmalloc of 4MB ?
>
You are asking 4MiB of contiguous memory that to physically contiguous.
In all probability you might want to use vmalloc if you need contiguous but not physically. Better to use alloc_pages to get pages instead but still no guarantees on your order.
Can you tell more about what you are trying to do?
> -Also find the attached log messages of dmesg
>
> Regards,
> Mehul
>
>
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