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Commit 650fb838 authored by Krzysztof Helt's avatar Krzysztof Helt Committed by David S. Miller
Browse files

[SPARC]: Migration cost tune up in sparc smp. 



This patch sets the max_cache_size value required to tune up
scheduler in SMP systems. Otherwise, the calculated
migration_cost is too high and task scheduling may lock up.

Signed-off-by: default avatarKrzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 9145bcf6

arch/sparc/kernel/smp.c

+11 −0
Original line number Diff line number Diff line
@@ -69,6 +69,17 @@ void __init smp_store_cpu_info(int id) 
						     "clock-frequency", 0);

	cpu_data(id).prom_node = cpu_node;

	cpu_data(id).mid = cpu_get_hwmid(cpu_node);



	/* this is required to tune the scheduler correctly */

	/* is it possible to have CPUs with different cache sizes? */

	if (id == boot_cpu_id) {

		int cache_line,cache_nlines;

		cache_line = 0x20;

		cache_line = prom_getintdefault(cpu_node, "ecache-line-size", cache_line);

		cache_nlines = 0x8000;

		cache_nlines = prom_getintdefault(cpu_node, "ecache-nlines", cache_nlines);

		max_cache_size = cache_line * cache_nlines;

	}

	if (cpu_data(id).mid < 0)

		panic("No MID found for CPU%d at node 0x%08d", id, cpu_node);

}