arm L_PTE_XXX entry addition for Debugging purpose

[Dhyan]

Thank You Bill !!!

I dont know my approach is correct or not,But the actual purpose was to
dump only  written pages of a user process using a kernel module.I have a
kernel thread which will dump user process memory in specific interval.So i
thought of updating this flag (L_PTE_DEBUG) from handle_pte_fault and clear
from my clear thread so that i can dump only the written pages after my
last dump.

if you have some  suggestions could you please share wth me?

--
Thanks
Dhyan

On Tue, Jul 31, 2012 at 12:43 PM, bill4carson <bill4carson at gmail.com> wrote:

>
>
> On 2012年07月30日 17:39, Dhyan wrote:
>
>> Dear All,
>>
>>  From linux(2.6.35) arm page table architecture i can see we have one
>> hardware page table and  there is corresponding Linux page table Entry
>> (L_PTE_*).The "Linux" PTE definitions are as like below from
>> arch/arm/include/asm/pgtable.**h.
>>
>> |#define L_PTE_PRESENT   (1<<  0)
>> #define L_PTE_FILE      (1<<  1)
>> #define L_PTE_YOUNG     (1<<  1)
>> #define L_PTE_BUFFERABLE(1<<  2)
>> #define L_PTE_CACHEABLE (1<<  3)
>> #define L_PTE_USER      (1<<  4)
>> #define L_PTE_WRITE     (1<<  5)
>> #define L_PTE_EXEC      (1<<  6)
>> #define L_PTE_DIRTY     (1<<  7)
>> #define L_PTE_COHERENT  (1<<  9)
>> #define L_PTE_SHARED    (1<<  10)
>> |
>>
>> So is it possible to add one more #|define L_PTE_DEBUG (1 << 11)| for my
>>
>> debugging purpose (basically to trap all the write to that page and set
>> this bit when write happens and clear it off in another thread   )? Or
>> is there any limitation like we can use only L_PTE till 10th bit ?
>>
>>
> No such limitation on bit 11, so you can use define L_PTE_DEBUG (1 << 11)
> However I don't follow why you want to do so?
>
>
>  So could you please help
>>
>> --
>>
>> Thanks & Regards
>>
>> Dhayn
>>
>>
>>
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>
> --
> Love each day!
>
> --bill
>
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