diff options
| author |   Krzysztof Helt <krzysztof.h1@wp.pl> | 2006-06-10 22:03:43 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2006-06-10 22:03:43 -0700 |
| commit | 650fb8382287f7990d5127a82a54295139224606 (patch) | |
| tree | 81080f0fc0857524c0c22699d8c1160faf94ed14 | |
| parent | [SPARC64]: Set appropriate max_cache_size. (diff) | |
| download | linux-dev-650fb8382287f7990d5127a82a54295139224606.tar.xz linux-dev-650fb8382287f7990d5127a82a54295139224606.zip | |
[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: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | arch/sparc/kernel/smp.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/sparc/kernel/smp.c b/arch/sparc/kernel/smp.c index a93f5da6855d..40b42c88e6a7 100644 --- a/arch/sparc/kernel/smp.c +++ b/arch/sparc/kernel/smp.c @@ -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); } |