Hello Abu, I had to include <linux/module.h> or an error was issued about "THIS_MODULE". What Kernel version are you using? I'm trying to compile it and I'm getting the error: [peter@ace m]$ make make -C /lib/modules/3.3.7-1.fc17.x86_64/build SUBDIRS=`pwd` modules make[1]: Entering directory `/usr/src/kernels/3.3.7-1.fc17.x86_64' CC [M] /tmp/m/m.o /tmp/m/m.c:36:2: error: unknown field ‘ioctl’ specified in initializer /tmp/m/m.c:36:2: warning: initialization from incompatible pointer type [enabled by default] /tmp/m/m.c:36:2: warning: (near initialization for ‘m_fops.llseek’) [enabled by default] make[2]: *** [/tmp/m/m.o] Error 1 make[1]: *** [_module_/tmp/m] Error 2 make[1]: Leaving directory `/usr/src/kernels/3.3.7-1.fc17.x86_64' make: *** [module] Error 2 According to: http://lxr.linux.no/linux+v3.4.1/include/linux/fs.h#L1609 There is no .ioctl at struct file_operations... Can you share how you've used perf/oprofile on your module/Kernel code? []'s Peter On Fri, Jun 1, 2012 at 3:52 PM, Abu Rasheda <rcpilot2010@xxxxxxxxx> wrote: >> If the buffer at user side is more then a page, then it may be that >> complete user space buffer is not available in memory and kernel spend time >> in processing page fault > > > I have attached code for module and user program. If anyone is bored over > the weekend they are welcome to try and explain the behavior. > > Abu Rasheda > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > -- Peter Senna Tschudin peter.senna@xxxxxxxxx gpg id: 48274C36 _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
