Thank you Mulyadi for your answer, appreciate very much!!!! On 6/28/08, Mulyadi Santosa <mulyadi.santosa@xxxxxxxxx> wrote: > Hi ! > > On 6/27/08, Peter Teoh <htmldeveloper@xxxxxxxxx> wrote: > > Is it true that the values of CR3 never change throughout the kernel > > life time? Ie, it points to based of the pagetable....so unless the > > pagetable is migrated it is not necessary to change. > > > It change whenever there is context switching between processes. Since > threads which belong to same parent share PGD, CR3 stays still if a > thread change to another thread which belong to the same parent (thus > share same tgid) > Ah...yes....which means that every process context switch the cr3 will change. But per-threads inside the process, nothing happened. I can see the pagetable creation per process in kernel/fork.c - essentially those pgd alloc stuff. Correct? Thanks. > > > And when the kernel switch to the userspace , each different process > > should have its own per-process pagetable...so in this case the CR3 > > will change its value per-process, correct? > > > CR3 stays the same when there is a switch between user space to kernel > space or vice versa (if there is no preemption in between...of > course). > -- Regards, Peter Teoh -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
