Messages in this thread Patch in this message | | | Date | Fri, 28 Feb 2003 23:36:55 -0800 | From | William Lee Irwin III <> | Subject | Re: percpu-2.5.63-bkcurr |
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On Fri, Feb 28, 2003 at 09:59:22PM -0800, William Lee Irwin III wrote: > Shove per-cpu areas into node-local memory for i386 discontigmem, > or at least NUMA-Q. You'll have to plop down early_cpu_to_node() > and early_node_to_cpumask() stubs to use it on, say Summit.
Tentative followup #1 (thanks Zwane!)
Use per-cpu rq's in the sched.c to avoid remote cache misses there. It actually means something now.
Index: linux-2.5.59/kernel/sched.c =================================================================== RCS file: /build/cvsroot/linux-2.5.59/kernel/sched.c,v retrieving revision 1.1.1.1 diff -u -r1.1.1.1 sched.c --- linux-2.5.59/kernel/sched.c 17 Jan 2003 02:46:29 -0000 1.1.1.1 +++ linux-2.5.59/kernel/sched.c 17 Jan 2003 10:03:31 -0000 @@ -160,9 +160,9 @@ atomic_t nr_iowait; } ____cacheline_aligned; -static struct runqueue runqueues[NR_CPUS] __cacheline_aligned; +static DEFINE_PER_CPU(struct runqueue, runqueues) = {{ 0 }}; -#define cpu_rq(cpu) (runqueues + (cpu)) +#define cpu_rq(cpu) (&per_cpu(runqueues, cpu)) #define this_rq() cpu_rq(smp_processor_id()) #define task_rq(p) cpu_rq(task_cpu(p)) #define cpu_curr(cpu) (cpu_rq(cpu)->curr) -- function.linuxpower.ca - 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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