On Tue, Apr 20, 2010 at 07:30:15PM +0530, Uma shankar wrote: > On Tue, Apr 20, 2010 at 7:13 PM, Johannes Weiner <hannes@xxxxxxxxxxx> wrote: > > On Tue, Apr 20, 2010 at 06:08:14PM +0530, Uma shankar wrote: > >> Hi, > >> > >> Is it possible for the kernel to access the user-stack data of a > >> task different from "current" ? ( This is needed for stack-dump as > >> well as backtrace. ) > > > > Yes, have a look at __get_user_pages() in mm/memory.c. > > > > Yes, I understand this. > > But have a look at "void show_stack(struct task_struct *tsk, > unsigned long *sp) " in traps.c ( arch specific ). > > Is there a implicit assumption that "tsk" and "current" are threads > sharing same "mm_strct" ? No, this is dumping the _kernel stack_ of a process, not the user stack. The mm_struct does not matter. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>