Re: [PATCH] [request for inclusion] Realtime LSM

[Ingo Molnar]

* Jack O'Quin <joq@xxxxxx> wrote:

> --- kernel/sched.c~	Fri Dec 24 15:35:24 2004
> +++ kernel/sched.c	Wed Jan 12 23:48:49 2005
> @@ -95,7 +95,7 @@
>  #define MAX_BONUS		(MAX_USER_PRIO * PRIO_BONUS_RATIO / 100)
>  #define INTERACTIVE_DELTA	  2
>  #define MAX_SLEEP_AVG		(DEF_TIMESLICE * MAX_BONUS)
> -#define STARVATION_LIMIT	(MAX_SLEEP_AVG)
> +#define STARVATION_LIMIT	0
>  #define NS_MAX_SLEEP_AVG	(JIFFIES_TO_NS(MAX_SLEEP_AVG))
>  #define CREDIT_LIMIT		100

could you try the patch below? The above patch wasnt enough. With the
patch below we turn off the starvation limits for nice --20 tasks only. 
This is still a hack only. If we cannot make nice --20 perform like
RT-prio-1 then there's some problem with SCHED_OTHER scheduling.

	Ingo

--- linux/kernel/sched.c.orig
+++ linux/kernel/sched.c
@@ -2245,10 +2245,10 @@ EXPORT_PER_CPU_SYMBOL(kstat);
  * if a better static_prio task has expired:
  */
 #define EXPIRED_STARVING(rq) \
-	((STARVATION_LIMIT && ((rq)->expired_timestamp && \
+	((task_nice(current) > -20) && ((STARVATION_LIMIT && ((rq)->expired_timestamp && \
 		(jiffies - (rq)->expired_timestamp >= \
 			STARVATION_LIMIT * ((rq)->nr_running) + 1))) || \
-			((rq)->curr->static_prio > (rq)->best_expired_prio))
+			((rq)->curr->static_prio > (rq)->best_expired_prio)))
 
 /*
  * Do the virtual cpu time signal calculations.
-
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