From: Jeremy Kerr Date: Fri, 29 Jun 2007 00:57:53 +0000 (+1000) Subject: [POWERPC] spusched: Fix timeslice calculations X-Git-Tag: v2.6.23-rc1~767^2^2~72 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=60e242393346c1a9a64e7b14dfb7f613a737324f;p=linux-2.6 [POWERPC] spusched: Fix timeslice calculations The current timeslice code mixes 'jiffies' up with 'spesched ticks'. This change correctly defines the number of time slices each SPE contexts is given, and clarifies the comment. This brings the default timeslice for SPE contexts into a reasonable range. Signed-off-by: Jeremy Kerr Signed-off-by: Paul Mackerras --- diff --git a/arch/powerpc/platforms/cell/spufs/sched.c b/arch/powerpc/platforms/cell/spufs/sched.c index 1b2916bdc1..6843a01b1a 100644 --- a/arch/powerpc/platforms/cell/spufs/sched.c +++ b/arch/powerpc/platforms/cell/spufs/sched.c @@ -70,11 +70,11 @@ static struct timer_list spusched_timer; /* * These are the 'tuning knobs' of the scheduler: * - * Minimum timeslice is 5 msecs (or 10 jiffies, whichever is larger), - * default timeslice is 100 msecs, maximum timeslice is 800 msecs. + * Minimum timeslice is 5 msecs (or 1 spu scheduler tick, whichever is + * larger), default timeslice is 100 msecs, maximum timeslice is 800 msecs. */ -#define MIN_SPU_TIMESLICE max(5 * HZ / 100, 10) -#define DEF_SPU_TIMESLICE (100 * HZ / 100) +#define MIN_SPU_TIMESLICE max(5 * HZ / (1000 * SPUSCHED_TICK), 1) +#define DEF_SPU_TIMESLICE (100 * HZ / (1000 * SPUSCHED_TICK)) #define MAX_USER_PRIO (MAX_PRIO - MAX_RT_PRIO) #define SCALE_PRIO(x, prio) \