Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [patch 4/4] powerpc 2.6.21-rt1: reduce scheduling latency by changing tlb flush size | Date | Mon, 14 May 2007 16:40:02 +0200 |
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On Monday 14 May 2007, Tsutomu OWA wrote: > --- linux-2.6.21-rt1/include/asm-powerpc/tlbflush.h 2007-04-26 12:08:32.000000000 +0900 > +++ rt/include/asm-powerpc/tlbflush.h 2007-05-14 16:12:47.000000000 +0900 > @@ -25,7 +25,12 @@ struct mm_struct; > #include <linux/percpu.h> > #include <asm/page.h> > > +#if defined(CONFIG_PPC_CELLEB) && defined(CONFIG_PREEMPT_RT) > +/* Since tlb flush takes long time on Celleb, reduce it to 1 when Celleb && RT */ > +#define PPC64_TLB_BATCH_NR 1 > +#else > #define PPC64_TLB_BATCH_NR 192 > +#endif /* defined(CONFIG_PPC_CELLEB) && defined(CONFIG_PREEMPT_RT) */
With this code, you get silent side-effects of enabling PPC_CELLEB along with another platform.
Maybe instead you should change the hpte_need_flush() to always flush when running on the celleb platform and PREEMPT_RT is enabled.
Arnd <>< - 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/
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