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 <[email protected]> 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 >> >> >> >> ______________________________**_________________ >> Kernelnewbies mailing list >> Kernelnewbies@kernelnewbies.**org <[email protected]> >> http://lists.kernelnewbies.**org/mailman/listinfo/**kernelnewbies<http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies> >> > > -- > Love each day! > > --bill >
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