On Fri, Apr 5, 2013 at 1:55 AM, neha naik <nehanaik27@xxxxxxxxx> wrote: > Hi All, > From what i have learnt vmalloc requires a minor page fault to sync the > process page tables with the reference page tables. So, is it safe to use > memory already allocated by vmalloc in io context/device driver code > (especially when the io call has returned back to the device driver after > finishing io on the device). I know that in general it is better to use > kmalloc (for better efficiency and so on....) but, i want to know if it is > inaccurate to use vmalloc in this particular case and why (in terms of > cannot service page faults in interrupt context etc)? to the best I know, majority of the devices expect page(s) to be physically contigous, whereas vmalloc() can't guarantee that. So IMHO that's the pitfall. -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
