Messages in this thread | | | From | Con Kolivas <> | Subject | Re: [PATCH] sched: Add SCHED_BGND (background) scheduling policy | Date | Wed, 5 Jul 2006 10:14:47 +1000 |
| |
On Wednesday 05 July 2006 09:35, Peter Williams wrote: > Problem: > > There is a genuine need for the ability to put tasks in the background > (a la the SCHED_IDLEPRIO policy in Con Kolivas's -sc kernels) as is > evidenced by comments in LKML re a desire for SCHED_BATCH tasks > to run completely in the background. > > Solution: > > Of course, one option would have been to just modify SCHED_BATCH so > that tasks with that policy run completely in the background but there is a > genuine need for a non background batch policy so the solution adopted > is to implementa a new policy SCHED_BGND. > > SCHED_BATCH means that it's a normal process and should get a fair > share of the CPU in accordance with its "nice" setting but it is NOT an > interactive task and should NOT receive any of the special treatment > that a task that is adjudged to be interactive receives. In particular, > it should always be moved to the expired array at the end of its time > slice as to do otherwise might result in CPU starvation for other tasks. > > SCHED_BGND means it's totally unimportant and should only be given the > CPU if no one else wants it OR if not giving it the CPU could lead to > priority inversion or starvation of other tasks due to this tasks holding > system resources.
Could we just call it SCHED_IDLEPRIO since it's the same thing and there are tools out there that already use this name?
-- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |