Hi, Vincenzo Mallozzi wrote: > I'm developing a LKM to monitor threads sharing the same memory descriptor. What do you call "memory descriptor" ? The mm_struct (http://lxr.linux.no/source/include/linux/sched.h#L207) or the vm_area_struct (http://lxr.linux.no/source/include/linux/mm.h#L61) ? > I set this descriptor (or parts of it) as not writable and then catch the page > fault exception caused by one (or more) threads when trying to write on it. When you say "set this descriptor as not writable", you mean changing vm_area_struct->vm_page_prot ? > The problem is that I've to catch only page fault exception caused by accesses > to global variable and not by accesses to local variables of each thread. > To do this, I've to know precisely what are the vmas of the shared memory > descriptor in which are stored the local data of threads. The local variables are stored on the stack. Simply don't mark the vma covering the stack as read-only, or skip your code when a page fault occurs in the stack. Sincerly, Thomas -- Thomas Petazzoni thomas.petazzoni@xxxxxxxx -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
