On Tue, May 08, 2007 at 04:16:06PM +0900, Satoru Takeuchi wrote: > Sometimes I wonder at prio_array. It has 140 entries(from 0 to 139), > and the meaning of each entry is as follows, I think. > > +-----------+-----------------------------------------------+ > | index | usage | > +-----------+-----------------------------------------------+ > | 0 - 98 | RT processes are here. They are in the entry | > | | whose index is 99 - sched_priority. |
>From sched.h: /* * Priority of a process goes from 0..MAX_PRIO-1, valid RT * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. so shouldn't the index for RT processes be 0 - 99, given that MAX_RT_PRIO = 100? > +-----------+-----------------------------------------------+ > | 99 | No one use it? CMIIW. | > +-----------+-----------------------------------------------+ > | 100 - 139 | Ordinally processes are here. They are in the | > | | entry whose index is (nice+120) +/- 5 | > +-----------+-----------------------------------------------+ > > What's the purpose of the prio_array[99]? Once I exlore source tree > briefly and can't found any kernel thread which uses this entry. > Does anybody know? -- Regards, vatsa - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
