Hi Milody, On Sun, Jul 10, 2011 at 8:55 PM, loody <miloody@xxxxxxxxx> wrote: > hi: > > 2011/7/11 Mulyadi Santosa <mulyadi.santosa@xxxxxxxxx>: >> Hi... >> ...snip... >> AFAIK they are user mode libc functions... > I found there are the same export_symbols in kernel. > I use them to dynamically change the priority. > It works but I found something interesting: > 1. if thread use schedule algorithm of SCHED_NORMAL, it cannot change > the priority. > 2. can we set the priority to any number less than (MAX_USER_RT_PRIO-1)? > ( I tried to set the priority as 99, but it fail) You need to change the scheduling algorithim to be SCHED_FIFO or SCHED_RR in order to use the real-time priorities. > 3. can we get the name of thread from task_struct or pid? > (I use "cat /proc/338/status", I can see the name of thread. But I > look around the task_struct, I cannot find any name information in > it.) You can use the comm field from the task struct. This can be set using the prctl API and passing in PR_SET_NAME. You can see the task name by doing something like ps -T -o pid,ppid,user,time,comm Normally, ps shows the args column. -- Dave Hylands Shuswap, BC, Canada http://www.davehylands.com _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
