Paged pool memory or Nonpaged pool memory ?? (windows driver development)

Hi all,

I am newbie in windows driver development. I just want to know , a global variable in a driver will use paged pool memory or non paged pool memory ?

Thanks and Regards

Navaneeth

From stackoverflow

• Depends. The Non paged pool should be reserved for memory that must stay in RAM so if you are doing something critical that would affected by a memory page from disk operation then use non paged.

  See here for more info.

  Looking at this (though it discusses c++ as opposed to C) it would seem that by default the globals can be located in either by #pragma. Also on p22 of this we see how to do this. Finally this discuss here we see that the data segment should be non pagagable by default.

  Navaneeth : No.my question is somthing like if i declare a global variable in device driver,which memory will be used ,ie paged pool memory or non-paged pool memory?(Local variable will use non paged pool memory).

  Navaneeth : it wont be depends. it will be either paged or non-paged pool.

• Global variables in a kernel mode driver are allocated from NonPagedPool.

  You can also use the device extension (when you call IoCreateDevice), it is always allocated from NonPaged memory.

  I hope this helps, Martin